Homework Help: Science: Biology

Recent Homework Questions About Biology

Biology
39. A) Identify a producer, herbivore, omnivore, and carnivore [in the ocean], explaining their roles in the path of energy flow. My answer: One producer in the ocean is algae; they provide energy. Krill are herbivores, which means that they feed off of plants. An omnivore ...
Friday, February 19, 2010 at 1:59pm

Biology
19. Which is NOT a general characteristic of plants? a. use oxygen to make usable energy b. primary producers c. have specialized cells d. cell walls composed of cellulose I think it might be either A or B... 20. Which of the following are characteristics of all animals? a. ...
Friday, February 19, 2010 at 10:52am

biology 102
A prediction (educated guesses as to what the potential results may be) for each experiment listed below: 1) knee-jerk reflex 2) pupillary reflex (shield left eye, shine bright light into right eye, observe pupils) 3) 2-point threshold 4) temperature discrimination 5) ...
Friday, February 19, 2010 at 2:41am

BIOLOGY
WHICH MUSCLE IS CONTRACTED TO FLEX YOUR FOREARM?
Thursday, February 18, 2010 at 8:52pm

Biology
What would happen to a protein in this example if the 9th base in the original DNA strand was changed to thymine ?
Thursday, February 18, 2010 at 5:39pm

Science Biology
How would i go about doing a dichotomous tree for beetles and how would i use it to do a dichotomous key for the beetles ? PLEASE HELP
Wednesday, February 17, 2010 at 8:53pm

Biology
2. Which statement best explains the effect of resources on population size? a. the exponential growth curve models the effects of limiting resources on population size b. Limited resources decrease the growth rate of population size c. Density-dependent factors invariably ...
Wednesday, February 17, 2010 at 8:50pm

Biology
Find a recent (from 2009 June onwards) and interesting article from the mass media with a theme that is related to topics learnt in Cell Biology. So far I've learnt Membrane Structure & function,Organelles and their structure & function, as well as their membrane systems, ...
Wednesday, February 17, 2010 at 8:03am

Biology
29. CFCs are a problem because they a. have been released in large quantities in the past b. break down to reactive free chlorine atoms c. attack ozone molecules in the upper atmosphere d. all of the above D? 10. Ozone depletion in the atmosphere a. leads to the formation of ...
Tuesday, February 16, 2010 at 7:13pm

Biology
24. Characteristics that biologists use to classify organisms are a. convergent evolution, cladogram, reproductive isolation b. reproductive isolation,evolutionary history, shared derived characteristics c. binomial nomenclature, shared derived characteristics, evolutionary ...
Tuesday, February 16, 2010 at 6:53pm

Biology
28. A community located downwind from a power plant that burns high-sulfur coals a. may experience the effects of acid rain b. is safe since pollution from the plant is dispersed by wind c. will experience ozone depletion in the surrounding air d. should filter the air before ...
Tuesday, February 16, 2010 at 6:51pm

Biology
Under which condition can you hold your breath longer? First breathe in as much as you can and hold your breath, and time it. (Lungs completely inflated) After, breathe out as much as you can, hold your breath, and time it. (Maximal expiration). Which condition can you hold ...
Monday, February 15, 2010 at 9:32pm

biology
a hibiscus plant was attacked by mealybugs which completely destroyed them.the mealybug was said to have thrived because it was not in its natural habitat.what is the likely effect of introducing an organism,like the mealybug,into a new habbitat?
Monday, February 15, 2010 at 7:33pm

biology
A seven-year-old boy breaks his tibia and requires immobilization by a hard cast for six weeks until the break heals. A potential consequence of this therapy is atrophy of the
Monday, February 15, 2010 at 7:28pm

biology
a hibiscus plant was attacked by mealybugs which completely destroyed them.what is the relationship between the mealybug and the hibiscus plant.
Monday, February 15, 2010 at 7:25pm

BIOLOGY
if a woman is a carrier for a disease (Hh) and a man has a 50% chance of being a carrier for that disease, what is the probability that they have a child with that disease? i've figured out that if the man IS a carrier, there is a 25% chance and if the man IS NOT a carrier...
Monday, February 15, 2010 at 7:11pm

Biology
40. DNA fingerprinting is used in many situations to help identify individuals. Analyze the situation below before answering the questions that follow. A man was attacked and robbed, but remembers nothing of the incident because he fell and hit his head. He has numerous cuts ...
Monday, February 15, 2010 at 5:38pm

Biology 201
Life is sometimes described as a constant struggle against the second law of thermodynamics. How do organisms succeed in this struggle without violating the second law?
Sunday, February 14, 2010 at 10:38pm

Biology
Need help with this: 40. DNA fingerprinting is used in many situations to help identify individuals. Analyze the situation below before answering the questions that follow. A man was attacked and robbed, but remembers nothing of the incident because he fell and hit his head. ...
Sunday, February 14, 2010 at 6:46pm

Biology
26. The relationship between population growth and resources can be described as a. inverse; as one goes up the other goes down b. parallel; when one goes up so does the other c. complex; there are many contributing factors d. equal; they both level off in any population ......
Sunday, February 14, 2010 at 12:59pm

Biology
38. Mitosis and meiosis are the two different ways cells divide. They both share common characteristics and processes, but differ in some very important ways. I answered part A and B of this, but I need help with C: c. Why is it important for chromosomal exchange to occur ...
Saturday, February 13, 2010 at 7:28pm

biology
I need to find the unique animal and plant life in the Belize's barrier reef. Can you tell me where to look, I have searched every where. Please
Friday, February 12, 2010 at 9:27pm

Biology
38. Mitosis and meiosis are two different ways cells divide. They both share common characteristics and processes, but differ in some very important ways. a. What are the end products of the two processes? How do they differ from the original or "parent" cell, if at ...
Friday, February 12, 2010 at 12:52pm

english
need to change all 1st and 2nd person pronouns to 3rd person pronouns for the following: We animals are the most complicated things you will find in the known universe. The universe that we know, of course, is a tiny fragment of the actual universe. There may yet be more ...
Thursday, February 11, 2010 at 11:45pm

Biology
What is the major function/role that the nucleus plays in the life of a living cell?
Thursday, February 11, 2010 at 10:01pm

Biology
why did the nuclei enriched fraction appear in the centrifuge fraction spun at the slower speed? Why didn't this fraction contain only nuclei(Why wasn't it pure?)?
Thursday, February 11, 2010 at 9:56pm

Biology
Why was it so important to keep all cellular fractions at or near 0 degree C throughout the entire isolation/purification procedure?
Thursday, February 11, 2010 at 9:53pm

Biology
Please help me !!! Compare and contrast the physiological functions of chloroplasts and mitochondria. Thanks
Thursday, February 11, 2010 at 9:48pm

biology
compare and contrast the variety of amino acids with that of monosaccharides and fatty acids. Which group exhibits the greatest structural variability?
Thursday, February 11, 2010 at 6:44pm

Biology
Plz help me find these words for puzzle. the questions are related to bacteria. 1. Ability of pathogen to kill (8 letters) 2. Ability of an organism to cause disease (8 letters) 3. One of the conditions for bacterial growth (8 letters) 4. Cells with no double membraned ...
Thursday, February 11, 2010 at 5:17pm

Biology
28. Natural selection causes a. changes in the environment b. plants and animals to produce more offpsring than can survive c. changes in the frequency of certain favorable characteristics in a population d. all of the above D? 30. When Darwin published his theory of evolution...
Thursday, February 11, 2010 at 4:57pm

Pre ap biology
Project on Eubacteria- What is the organs modus operand1
Thursday, February 11, 2010 at 11:53am

biology
6. A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ...
Thursday, February 11, 2010 at 2:39am

Biology
Could someone please help me answer the following questions; 1. What unique property of carbon is responsible for the large number of organic compounds? 2. Alkanes, alkene and alkynes are all insoluble in water whereas alcohols, aldehydes and ketones are. Explain Thank You
Wednesday, February 10, 2010 at 7:29pm

Biology
What molecules cycle between the light and light independent phase of photosynthethis?
Wednesday, February 10, 2010 at 7:02pm

Biology
what molecules cycle between the light dependent and light independent stages of photosynthethis
Wednesday, February 10, 2010 at 6:59pm

biology
what are some of the ways in which we can differentiate spores from coccus shaped bateria?
Wednesday, February 10, 2010 at 12:40am

biology
during the preparation of the capsule stain, the slide used to spread the India ink/bacteria mixture is discarded in the disinfectant solution why?
Wednesday, February 10, 2010 at 12:38am

Biology
23. A medical condition that can be treated by using proteins produced through genetic engineering is a. depression b. multiple sclerosis c. hemophilia d. all of the above 26. Endosymbiosis best explains the possible evolutionary beginnings of a. prokaryotes b. cyanobacteria c...
Monday, February 8, 2010 at 7:32pm

Biology
17. When errors in nucleotide sequencing occur, a. DNA polymerases replaces the incorrect nucleotide with the correct nucleotide b. enzymes dissolve the incorrect nucleotide so DNA polymerase can add the correct one c. purines replace pyrimidines in the DNA molecule d. DNA ...
Monday, February 8, 2010 at 5:32pm

biology
how have sarcodines built geological features of the environment?
Monday, February 8, 2010 at 3:34pm

Biology
A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ...
Monday, February 8, 2010 at 1:40pm

biology
what are three function of a teeth
Sunday, February 7, 2010 at 7:19pm

biology
what are three function of a teeth
Sunday, February 7, 2010 at 7:11pm

biology
what are three function of teeth
Sunday, February 7, 2010 at 6:59pm

Biology
37. Both animals and plant cells undergo cytokinesis after mitosis ends. How is the process and its outcome the same for both animals and plant cells? How is the process and its outcome different for animal and plant cells? Due to the presence of a cell wall, cytokinesis in ...
Sunday, February 7, 2010 at 3:18pm

Biology
Can you give the speed in the capillaries as a percentage of the speed in the arteries.
Saturday, February 6, 2010 at 2:32pm

Biology
Why is it desirable for blood to flow through the capillaries comparratively slowly.
Saturday, February 6, 2010 at 2:29pm

Biology
Is there an experiment which you could do to test the suggestion that veins have more stretchable walls than arteries.
Saturday, February 6, 2010 at 2:26pm

Biology
Why veins contain valves.
Saturday, February 6, 2010 at 2:24pm

Biology
Why capillaries have very thin walls.
Saturday, February 6, 2010 at 2:24pm

Biology
Just need this checked: 'The cytoskeleton of eukaryotes serves many functions. One of these functions is served in prokaryotes by a different major structure. Which structural feature is it? How do these different structures serve the same function in the two cell types?&#...
Friday, February 5, 2010 at 8:36pm

Biology
Just need to answer these last two questions in order to finish my lesson one test. Please help 37. Both animals and plant cells undergo cytokinesis after mitosis ends. How is the process and its outcome the same for both animals and plant cells? How is the process and its ...
Friday, February 5, 2010 at 8:26pm

Biology
The mitotic process provides a mechanism by which cells should be able to transfer their genomic contents from cell generation to cell generation without error or change. is this inviolate?
Friday, February 5, 2010 at 1:05am

Biology
Please help me list some of the major differences in the process of mitosis as it occurs in higher plants and as it occurs animals.
Friday, February 5, 2010 at 1:02am

Biology
Where in the cell cycle can one find the phragmoplast? What is it's probable function?
Friday, February 5, 2010 at 1:01am

Biology
17. When errors in nucleotide sequencing occur, a. DNA polymerase replaces the incorrect nucleotide with the correct nucleotide b. enzymes dissolve the incorrect nucleotide so DNA polymerase can add the correct one c. purines replace pyrimidines in the DNA molecule d. DNA ...
Thursday, February 4, 2010 at 8:21pm

Introduction to Biology and the Scientific Method
What are the Ten characteristics that distinguish an object or thing from an actual living organism where all 10 characteristics must be present simultaneously for something to be considered living?
Thursday, February 4, 2010 at 7:34pm

Biology
c. The cytoskeleton of eukaryotes serves many functions. One of these functions is served in eukaryotes by a different major structure. Which structural feature is it? How do these different structures serve the same function in the two cell types? Is it the cell wall? Thanks -MC
Thursday, February 4, 2010 at 5:05pm

Biology
Name three characteristics of mitochondria and chloroplasts that support the endosymbiotic hypothesis of eukaryotic evolution?
Wednesday, February 3, 2010 at 9:59pm

Biology
Explain how early RNA molecules might have been able to respond to natural selection?
Wednesday, February 3, 2010 at 9:57pm

Biology
Why was the discovery of microspheres and coacervates an important contribution to the understanding of how life might have originated on Earth?
Wednesday, February 3, 2010 at 9:56pm

Biology
Why do some scientist think that areas protected from the atmosphere might have favored the production of organic compounds on early life?
Wednesday, February 3, 2010 at 9:54pm

Biology
Explain how the half-life of a radioactive isotope affects the usefulness of that isotpe in dating specific types of rock?
Wednesday, February 3, 2010 at 9:52pm

Biology
14. The major components of a DNA molecular subunit are a. a chromosome, deoxyribose, and double helix b. a five-carbon sugar, phosphate group, and a nitrogen-containing base c. adenine, guanine, cytosine, and thymine d. all of the above D? 16. During DNA replication, all of ...
Wednesday, February 3, 2010 at 8:11pm

biology
How might the efficiency of glycolysis change if this process occurred in only one step?
Wednesday, February 3, 2010 at 7:51pm

Biology
14. The major components of a DNA molecular subunit are a. a chromosome, deoxyribose, and double helix b. a five-carbon sugar, phosphate group, and a nitrogen-containing base c. adenine, guanine, cytosine, and thymine d. all of the above D 16. During DNA replication, all of ...
Wednesday, February 3, 2010 at 6:03pm

biology
what causes the PH to change as the food moves from the stomach to the small intestine
Wednesday, February 3, 2010 at 4:17pm

biology
Name at least 3 useful purposes for bacterial endospores. -I have only 2, which are: produce antibiotics and produce toxins that kill insects. Also, how is the spore location within the cell used to differentiate species? -All I could find is that the location is species-...
Tuesday, February 2, 2010 at 9:25pm

Biology
Why arteries have more muscle in their walls than veins
Tuesday, February 2, 2010 at 6:50pm

Biology
Why the left ventricle has a thicker more muscular wall than the right ventricle.
Tuesday, February 2, 2010 at 6:49pm

Biology
Why the right atrium is larger than the left atrium.
Tuesday, February 2, 2010 at 6:48pm

Biology
Why does the blood pressure goes up and down all the time.
Tuesday, February 2, 2010 at 6:45pm

Biology
a) What is a major structural advantage that eukaryotic cells have over prokaryotic cells? Why is this so important? My answer: The organelles in eukaryotic cells allow them to perform more complex functions than prokaryotic cells, which don't have these little organs. One...
Tuesday, February 2, 2010 at 3:47pm

Biology
What kind of energy do humans run on ?
Monday, February 1, 2010 at 7:29pm

Biology
I have to write 2-4 sentences on these questions. Can I please get some help? 'Both animal and plant cells undergo cytokinesis after mitosis ends. a) How is the process and its outcome same for both animal and plant cells? b)How is the process and its outcome different for...
Monday, February 1, 2010 at 6:54pm

Biology
Need help with this one: c)The cytoskeleton of eukaryotes serves many functions. One of these functions is served in prokaryotes by a different major structure. Which structural feature is it? How do these different structures serve the same function in the two cell types? ...
Monday, February 1, 2010 at 5:53pm

Biology
a) What is a major structural advantage that eukaryotic cells have over prokaryotic cells? Why is this so important? I'm not sure if this is asking for the nucleus or if it's asking about the organelles...which one should I write about? Thanks -MC
Monday, February 1, 2010 at 5:26pm

Biology
b) Identify one similar and one different way each type of cell [prokaryote and eukaryote] uses flagella. My answer: In both prokaryotes and eukaryotes, flagella protrude from the cell's surface and enable movement. Prokaryotic flagella rotate, propelling the organism ...
Monday, February 1, 2010 at 2:39pm

Biology--Urgent
Need help with these: a) What is a major structural advantage that eukaryotic cells have over prokaryotic cells? Why is this so important? b) Identify one similar and one different way each type of cell uses flagella c)The cytoskeleton of eukaryotes serves many functions. One ...
Monday, February 1, 2010 at 1:10pm

biology
3. In what cells do meiosis and mitosis take place? 4. If one strand of DNA, had bases ordered ATCCGTC, what would be the bases of its other strand?
Sunday, January 31, 2010 at 4:23pm

Biology
27. Which of the following is true for both aerobic and anaerobic respiration? a. ATP is produced during glycolysis b. Pyruvate is broken down to ethanol or lactate c. The electron transport chain pumps hydrogen ions across a membrane d. An organic hydrogen acceptor recycles ...
Saturday, January 30, 2010 at 7:19pm

biology
biological interrelationship among life forms; means hoe animals or plants depend on one another? where can I find the information on this topic on Belize's barrier reef system
Saturday, January 30, 2010 at 4:38pm

biology
How do autosomes differ from sex chromosomes?
Saturday, January 30, 2010 at 2:24pm

biology
How do autosomes differ from sex chromosomes?
Saturday, January 30, 2010 at 2:19pm

Biology
10. Most of the time, genetic characters are inherited by more complex patterns of heredity including all of the following EXCEPT a. solitary alleles b. incomplete dominance c. codominance d. polygenic inheritance A? 11. Both sickle-cell anemia and hemophilia a. are caused by ...
Saturday, January 30, 2010 at 2:14pm

Biology--Urgent
27. Which of the following is true for both aerobic and anaerobic respiration? a. ATP is produced during glycolysis b. Pyruvate is broken down to ethanol or lactate c. The electron transport chain pumps hydrogen ions across a membrane d. An organic hydrogen acceptor recycles ...
Saturday, January 30, 2010 at 2:06pm

biology
what animals and plants are unique in the Belize's barrier reef system? would it be; blue green algae, mangroves and large seagrass meadows.marine turtles, manatees and marine crocodiles? I also need to find the animals and plants that are diversity in this area. please ...
Saturday, January 30, 2010 at 1:34pm

biology
Why would it be more difficult to work with chromosomes that are unsained, rather than stained chromosomes, the banding is the result of the stain?
Friday, January 29, 2010 at 10:06pm

biology
Why would it be more difficult to work with chromosomes that are unsained, rather than stained chromosomes, the banding is the result of the stain?
Friday, January 29, 2010 at 10:02pm

biology
What is the benefit of working with an enlarged photograph of the chromosomes instead of the chromosomes themselves?
Friday, January 29, 2010 at 9:34pm

Biology
3. Which of the follwoing statements about sexual and asexual reproduction is FALSE? a. genetic diversity occurs in sexual reproduction b. asexually reproducing organisms can repair their own DNA c. there are no special reproductive celss in asexual reproduction d. a ...
Friday, January 29, 2010 at 2:40pm

biology
imagine if you are a water molecule outside of an animal cell of a human.the person just drunk the glass.write a persuasive letter to the cell membrane convincing it to let you inside the cell.
Thursday, January 28, 2010 at 3:25pm

Biology
14. Surface area is an important factor in limiting growth cell because a. the cell may become too large to remove enough wastes. b. materials can't enter the cell if it's too large c. the cell can burst if the membrane becomes too large d. waste products can't ...
Thursday, January 28, 2010 at 2:08pm

biology
All living things reproduce using ________.
Thursday, January 28, 2010 at 11:30am

Biology
I don't understand how to do this at all!! I've been Googling the past hour and I just don't get it. My teacher won't respond and my exam is tomorrow. I get that we cleave with an acid and then we can do amino acid analysis. The entire protein can be pieced ...
Wednesday, January 27, 2010 at 10:39pm

biology
What role, if any, do you think people must play in preserving those regions threatened by human encroachment
Wednesday, January 27, 2010 at 10:02pm

Biology
Are these correct? Cohesion=Water molecules stick to the side of a straw because of this attractive force. Adhesion=Liquid mercury forms drops because of this attractive force Polarity=This property of water enables salt to dissolve in water Base=This is a substance that ...
Wednesday, January 27, 2010 at 4:31pm

Biology---Urgent
14. Surface area is an important factor in limiting growth cell because a. the cell may become too large to remove enough wastes. b. materials can't enter the cell if it's too large c. the cell can burst if the membrane becomes too large d. waste products can't ...
Wednesday, January 27, 2010 at 4:24pm

Biology
What are three major types of disorders? Give examples of each.
Tuesday, January 26, 2010 at 9:43pm

Biology
9. A molecule shaped like a spiral staircase (double helix) is a typical of a. deoxyribonucleic acid b. ribonucleic acid c. carbohydrates d. both a and b D 14. Surface area is an important factor in limiting growth cell because a. the cell may become too large to remove enough...
Tuesday, January 26, 2010 at 7:34pm

biology
What are the biological levels of organization from largest to smallest?
Tuesday, January 26, 2010 at 6:47pm

Biology please hurry
Here's the question I need help with: What characteristics does your animal have the same as other animals in larger classification levels above it. My animal I chose was an emperor penguin. I really need help thanks
Tuesday, January 26, 2010 at 5:50pm

Biology--Urgent
Need help with this: 'Social bees survive by collecting nectar or pollen from flowers, pollinating the flower in the process. They must keep their hives at a constant temperature, moisture, and oxygen content for their larvae to develop. One way they do this is by beating ...
Tuesday, January 26, 2010 at 4:39pm

Biology
1. What provides the shortest-term mechanism for preventing acid-base imbalances in the body? The longest-term machanism? I am really stuck on this one....is it the renal and repsiratory compensations???? Thanks in advance for the help!
Tuesday, January 26, 2010 at 2:53pm

biology
Compare the chemical composition of the contents of the stomach one hour after eating a meal containing proteins, carbohydrates, and fats, to the contents of the small intestine several hours later.
Monday, January 25, 2010 at 9:27pm

Biology
Need help with these two: PLEASE help me; this is like the 4th time I'm posting this. 26. Why do plant cells contain both choroplasts and mitochondria? a. in the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs. b. if plants can't produce...
Monday, January 25, 2010 at 3:24pm

biology
is the overall charge of glu (glutamate) at a pH of 4.3 0? I thought it would be since there is a (+) charge on the NH3, counteracted by the negative charge on the COO(-) group.
Monday, January 25, 2010 at 1:22am

biology
__________________ charcters show many degrees of variation because they result from the additive effects of several ____________. Many human conditions are complex because they are influenced both by ___________ and by ___________. If two genes cross oveer 35 percent of the ...
Sunday, January 24, 2010 at 10:05pm

Biology
Need help with these two: 26. Why do plant cells contain both choroplasts and mitochondria? a. in the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs. b. if plants can't produce enough ATP to make sugars during photosynthesis, they can ...
Sunday, January 24, 2010 at 3:43pm

biology
How does the orientation of the phospholipids in the bilayer allow a cell to interact with its internal and external environment?
Sunday, January 24, 2010 at 9:44am

biology
Why does a plant cell transports water against the force of gravity contain many more mitochondria than other plant cells?
Saturday, January 23, 2010 at 9:49pm

biology
explain the role of antigens and antibodies in natural and artificial control of diseases
Saturday, January 23, 2010 at 6:22pm

biology
need help If one strand of DNA, had bases ordered ATCCGTC, what would be the bases of its other strand? Compare and contrast mitosis and meiosis as to: number of divisions, number of cells produced, number of chromosomes in parent cells and in gametes.
Saturday, January 23, 2010 at 1:49pm

biology
Need Help with these questions If one strand of DNA, had bases ordered ATCCGTC, what would be the bases of its other strand? Compare and contrast mitosis and meiosis as to: number of divisions, number of cells produced, number of chromosomes in parent cells and in gametes.
Friday, January 22, 2010 at 10:59pm

Biology
17. Functions of the nucleus include a. directing the function of the cell b. the partial assembly of ribosomes c. storing most of the hereditary information of the cell d. all of the above D? 18. Internal membrances play important roles in protien production and processing ...
Friday, January 22, 2010 at 6:07pm

Biology
1. Homeostasis relates most directly to which of the following ideas? a. interacting systems b. stability c. evolution d. scale and structure I'm stuck between A and B 2. The physician Ronald Ross wanted to find the cause of malaria. Based on his observations, Dr.Ross ...
Friday, January 22, 2010 at 5:36pm

biology 123456789 123456789 123456789
how can nitrogenous fertilizers destroy life in streams and rivers?
Friday, January 22, 2010 at 1:23pm

Biology
Can someone please check if my answers are correct? 21. The difference between autotroph and heterotroph is that a. heterotrophs must get energy from sources other than the sun b. heterotrophs can use chemical or light energy sources c. heterotrophs do not obtain energy from ...
Friday, January 22, 2010 at 1:14pm

Biology
Can someone please check if my answers are correct? 17. Functions of the nucleus include a. directing the function of the cell b. the partial assembly of ribosomes c. storing most of the hereditary information of the cell d. all of the above D? 18. Internal membrances play ...
Friday, January 22, 2010 at 1:11pm

Biology 123456789 123456789 123456789
how can nitrogenous fertilizers destroy life in streams and rivers?
Friday, January 22, 2010 at 12:47pm

Biology
why is a radioisotope able to substitute for an ordinary (nonradioisotope) atom of the same element in a molecule?
Thursday, January 21, 2010 at 10:18pm

Biology
Are these correct? A. harvests energy from organic compounds= mitochondria B. makes proteins in both types of cells= ribosomes C. uses light energy to make food= chloroplasts D. outer support for plant cells= cell wall E. gives shape and protection to animals= cell membrane F...
Thursday, January 21, 2010 at 8:08pm

biology
why does water after evaported not turn to H+ ions. is it be cause of the intermolecurar and intramolecuar forces?
Thursday, January 21, 2010 at 6:23pm

Biology
does energy and matter cycle through an ecosystem
Thursday, January 21, 2010 at 5:45pm

Biology
21. The difference between autotroph and heterotroph is that a. heterotrophs must get energy from sources other than the sun b. heterotrophs can use chemical or light energy sources c. heterotrophs do not obtain energy from autotrophs d. all of the above A? 25. Which of the ...
Thursday, January 21, 2010 at 4:09pm

Biology
9. a molecule shaped like a spiral staircase (double helix) is a typical of a. deoxyribonucleic acid b. ribonucleic acid c. carbohydrates d. both a and b D? 10. ATP is important to living organisms because it a. stores hereditary information b. stores energy from food to be ...
Thursday, January 21, 2010 at 1:52pm

Biology
4. The difference between an atom and and element is a. an element is made of atoms b. atoms are made of elements c. atoms are held together by covalent bonds d. none of the above C? 6. Which of the following is NOT an organic compound? a. ATP molecule b. saturated fatty acid ...
Thursday, January 21, 2010 at 1:51pm

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