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Homework Help: Science: Biology

Recent Homework Questions About Biology

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Math
A student earned scores of 85, 83, 90, 94, 88 and 84 on the first six tests in a biology class. What score is needed on the seventh test to produce an 86 average?
Monday, March 21, 2011 at 10:15pm

marine biology
Choose the plants from the following list that you would find in the lower shore area of the rocky shore. kelp lichens irish moss rockweed
Monday, March 21, 2011 at 5:34pm

biology
what is the function of the rat diastema??
Sunday, March 20, 2011 at 9:42pm

Biology
How does the structure of macromolecules such as proteins act as an index of relatedness between species?
Saturday, March 19, 2011 at 11:35pm

Biology Research
Hello, I have to analyse two research articles about how carbon dioxide affect plant growth. one of the questions I have to answer is to "compare the research approach" for the two articles. I am not completely certain what " research approach refers to" ...
Saturday, March 19, 2011 at 9:04pm

biology
all test crosses are back cross. but all back crosses are not test cross. justify the statment
Saturday, March 19, 2011 at 5:42pm

English
just can't figure these sentences out. have to rewrite these sentences, correcting the problem of incorrect omission.? 1. A liberal arts background is excellent for such professions as lawyers and doctors. 2. American colleges consistently produce more physical education ...
Saturday, March 19, 2011 at 8:57am

English
I just can't figure these sentences out. have to rewrite these sentences, correcting the problem of incorrect omission.? 1. A liberal arts background is excellent for such professions as lawyers and doctors. 2. American colleges consistently produce more physical education...
Friday, March 18, 2011 at 2:55pm

Biology
why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...
Thursday, March 17, 2011 at 9:45pm

biology /help
. The hemophilia gene is located 12 map units from the red-green colorblindness gene on the X chromosome. Red-green colorblindness is recessive to normal color vision. A woman with normal blood clotting and normal color vision, but whose father was a hemophiliac and whose ...
Thursday, March 17, 2011 at 8:47pm

biology/science
when an indigestion tablet is placed in water, carbon dioxide is given off. describe the test for carbon dioxide.
Thursday, March 17, 2011 at 7:45am

English
Though I specialized in Germanic languages, I need to present (in a very simple way using a very simple language) some scientific topics in English to Italian 18-year-old-students (studying applied sciences) whose English is very poor. I'm seeking internet sites where ...
Thursday, March 17, 2011 at 6:32am

Biology
Please help with this, What was it important to have a detailed growth curve for your test plant (which was a Lemna spp.) sample on a frequent basis grown under control conditions without a test chemical?
Thursday, March 17, 2011 at 3:12am

biology
If an elodea leave is place in pure distilled water, what will happen? plus will this be isotonic or hypertonic or hypotonic solution.
Tuesday, March 15, 2011 at 10:53pm

biology
what can we use to measure exactly 0.55ml of water. and what can we use to measure exactly 85ml of water.
Monday, March 14, 2011 at 11:19pm

AP Biology- Molecular Genetics
The correct sequence between genes and their phenotypic expression is a) RNA-DNA-protein-trait b) DNA-RNA-protein-trait c) Protein-DNA-RNA-trait d) trait-DNA-RNA-protein I think it is either b or d but do not know if the trait is at the beginnig or end... Once translated, the ...
Monday, March 14, 2011 at 10:50pm

Biology
external features of the rat (rattus norvegicus) What is the function of the diastema? In the female rat , is the vulva always open??? Are the testes always present in the scrotal sacs? is there a bone in the !@#$%^&? if yes wat is this bone called?
Monday, March 14, 2011 at 2:07pm

AP Biology
A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1 micrograms) Cell 2 (5.4 ...
Saturday, March 12, 2011 at 9:10pm

Biology
We extract energy from macronutrients primarily from which of the following types of chemical reactions?
Wednesday, March 9, 2011 at 6:32pm

biology
Which of these characteristics is NOT found in the amphibians?
Wednesday, March 9, 2011 at 6:23pm

Biology
You find an unusual organism growing on the bark of a dying tree. Under a microscope, you observe that its cells are eukaryotic, have cell walls, and do not contain chloroplasts. Into what kingdom would you classify this organism? Explain your decision.
Tuesday, March 8, 2011 at 3:11pm

Biology
imaginary population of fruit doves, Half had purple head feathers and half had green head feathers. Describe how natural selection could act upon this population. What change might you see over time? (really need help with this, looked in my textbook i coudnt get it)
Tuesday, March 8, 2011 at 8:44am

BIOLOGY/ A & P
The myelination of central and peripheral axons occurs rapidly through the first few yrs, how can this development process explain the inproved motor abilities of infants and toddlers?
Monday, March 7, 2011 at 2:41pm

BIOLOGY 109
The myelination of central and peripheral axons occurs rapidly through the first few yrs, how can this development process explain the inproved motor abilities of infants and toddlers?
Monday, March 7, 2011 at 1:54pm

Costs and Awards
Look for two programs that appeal to you at Education Planner and complete the chart below for each program. Program Name 1: Bachelor of Science in Pharmacy Degree Insitution: UBC IF Location: Point Grey Campus-Vancouver B.C Length of Program: Four years Tuition Levels (Approx...
Friday, March 4, 2011 at 8:49pm

biology
what is the second law of thermodynamics.
Thursday, March 3, 2011 at 4:02pm

Biology
The human retina has an area of about 1000 mm^2. If we have a total of 125 million rods and 6.5 million cones in each eye, show that we have about 131,500 sensory cells per square millimeter in the retina.
Thursday, March 3, 2011 at 3:25pm

biology
If you inject carbon nanotubes into the body, can we produce antibodies against it? some ideas: - my answer is yes and no... the carbon nanotubes are too large for the t-cell to destroy it; therefore, they won't have an affect. -plus our whole body is made of carbon; ...
Thursday, March 3, 2011 at 12:36pm

Biology
What lines of support are there for evolution and what examples can be seen for each of these?
Wednesday, March 2, 2011 at 9:55pm

Biology
As scientists tried to discover the nature of genes, what three critical gene functions had they identified?
Wednesday, March 2, 2011 at 9:40pm

Biology
As scientists tried to discover the nature of genes, what three critical gene functions had they identified?
Wednesday, March 2, 2011 at 9:29pm

Biology
A space probe discovers a planet inhabited by creatures who reproduce with the same hereditary patterns as those in humans. Three phenotypic characters are height (T = tall, t = dwarf), hearing appendages (A = antennae, a = no antennae), and nose morphology (S = upturned snout...
Wednesday, March 2, 2011 at 9:10pm

biology - glycolysis +atp (help)
9. The total amount of energy released from the chemical bonds of glucose is 2870 kJ/mol, after the initial investment of 2 ATP. The total energy that can be harvested to form ATP molecules is about 1200 kJ/mol. a. After the initial investment of 2 ATP, 38 ATP are produced. ...
Wednesday, March 2, 2011 at 7:28am

Biology - gylcolysis history (help+check)
The process of glycolysis is thought to have emerged very early in the origins of life. What evidence to support this theory can you find in the material presented in this section? Be prepared to defend your ideas. Ans: is this question indirectly related to cell theory, the ...
Wednesday, March 2, 2011 at 7:26am

biology
what forms between the other two primary tissue layers
Tuesday, March 1, 2011 at 11:24pm

biology
A question in Campbell's 8th edition study guide for AP Biology says: A multifactorial disorder _. Answer: has a collection of symptoms traceable to an epistatic gene. There is another answer choice which says : has both genetic and environmental causes. Shouldn't the ...
Tuesday, March 1, 2011 at 9:29pm

Biology- PLEASE HELP ME ):
how does the salinity of a solution affect osmosis in an onion cell?
Tuesday, March 1, 2011 at 6:59pm

Biology
Name the intermediates of the Calvin cycle... I am thinking it is 1) Carbon fixation 2) Reduction 3) Regeneration But I believe it is wrong because they are stages... :S help anybody?
Tuesday, March 1, 2011 at 6:51pm

Biology
The trachea is ___________ to the lungs Toes are _______________to the shoulders Esophagus is _____________ to trachea Pinna is ______________ to tail Liver is ______________ to stomach Options are Anterior, Posterior, dorsal, ventral, lateral, median, superior, inferior, ...
Tuesday, March 1, 2011 at 9:35am

Biology
We did this lab in which we used 3 brands of hand sanitizers and did the kirby bauer test. We measured the zone of inhibition for each of the three trials in millimeter. I need to make a graph, probably a line graph but im not sure what to put for the x and the y axis because ...
Monday, February 28, 2011 at 8:43pm

biology
how to label the ecstasy molecular structure plz name each part the formula is C11 H15 NO2 HCl
Monday, February 28, 2011 at 8:32pm

gr. 12 biology
My teacher wants me to calculate the rate of enzyme activity (1/s) I'm given the temperatures: 0 , 15, 30, ,50, and 80 (degrees celsius) AND the times 8.74, 18.83, 14.30, 34.22, and infinity respectively (seconds obviously, these are the times it took the enzyme to react...
Sunday, February 27, 2011 at 9:00pm

Biology
in what categorize does Esctacy belong to? carbohydrate, lipid, protein or nucleic acid and why. can some give me 2 or 3 exaple why is belogs to it thank you in advenge
Sunday, February 27, 2011 at 8:07pm

gr. 12 biology
My teacher wants me to calculate the rate of enzyme activity (1/s) I'm given the temperatures: 0 , 15, 30, ,50, and 80 (degrees celsius) AND the times 8.74, 18.83, 14.30, 34.22, and infinity respectively (seconds obviously, these are the times it took the enzyme to react...
Sunday, February 27, 2011 at 8:00pm

Biology
how does esctacy work plz i need 3 explanation
Sunday, February 27, 2011 at 6:10pm

biology grade 12
My teacher wants me to calculate the rate of enzyme activity (1/s) I'm given the temperatures: 0 , 15, 30, ,50, and 80 (degrees celsius) AND the times 8.74, 18.83, 14.30, 34.22, and infinity (seconds obviously, these are the times it took the enzyme to react) What am i ...
Sunday, February 27, 2011 at 5:45pm

biology
in what categorize does Esctacy belong to? carbohydrate, lipid, protein or nucleic acid and why. can some give me 2 or 3 exaple why is belogs to it thank you in advenge
Sunday, February 27, 2011 at 4:54pm

Biology
Can you describe at which stage oxygen is involved and explain its role, in photosynthesis please? Also in respiration too if you can :) (my subject at school is phytoplankton) thank you for your help
Friday, February 25, 2011 at 10:27am

Biology
If a human needs to eat about 10 000 kJ per day, estimate (to the nearest gram) the mass of phytoplankton that would be required to meet their daily energy requirements. Based on this value, approximately what proportion of her own body weight in phytoplankton would a 60 kg ...
Friday, February 25, 2011 at 10:16am

Biology
In recent years phytoplankton have been investigated as a potential source of energy for humans. Researchers have therefore been interested in whether these organisms could be ‘farmed’ to provide food or fuel. In terms of biomass, Gross Primary Production (GPP) in ...
Friday, February 25, 2011 at 10:15am

cell biology
What is the mass of 2.00 L of an intravenous glucose solution w/ a density of 1.15 g/ml?
Friday, February 25, 2011 at 8:26am

biology
Suppose that the concentration of H+ in solution #1 is 10,000 times greater than the solution #2. What can you conclude about the difference in pH of these two solutions?
Friday, February 25, 2011 at 2:15am

biology
Explain that the energy needed to produce ATP comes from food during cellular respiration.
Thursday, February 24, 2011 at 11:25am

AP Biology
the process of making a complimentary copy of the DNA to form RNA is called?
Wednesday, February 23, 2011 at 11:22pm

BIOLOGY
Why are seeds considered a more effective means of reproduction than spores in a dry environment?
Wednesday, February 23, 2011 at 10:15pm

Biology
What did Darwin believe is the consequence of overpopulation in animals and plants?
Tuesday, February 22, 2011 at 11:05am

Biology
Darwin believed that Malthus' ideas about human populations applied more strongly to animals and plants. Why?
Tuesday, February 22, 2011 at 10:41am

Biology
Can Someone please trace a molecule of O2 in extreme detail from the air to the a muscle cell in the left calf?
Monday, February 21, 2011 at 12:36pm

Biology
Kay so these are the strands of DNA 5' C C A G T A G T T 3' 3' G G T C A T C A A 5' Let's say the DNA molecule above were the parent strand of DNA. when the strands are split for replication, which strand would be the template for the leading strand? And ...
Sunday, February 20, 2011 at 8:03pm

biology
what is the nature of the walls of the phloem vessels after they are stained in the microscopic section
Sunday, February 20, 2011 at 8:00am

Biology
What organelle do plant cells have that animal cells don't? other than chloroplast.
Saturday, February 19, 2011 at 10:46pm

Biology
An organism has three independently assorting traits AaBbCc. What fraction of its gametes will contain the recessive gene abc?
Thursday, February 17, 2011 at 10:24pm

biology
who made the first dna model and when
Thursday, February 17, 2011 at 5:00pm

French-Simple question
Im trying to find out what each person is studying. Every person in my text has a bubble over their heads, and in that bubble is a picture such as...one person had a bubble picture of a microscope over their heads, so that would mean that they are studing biology. What course/...
Wednesday, February 16, 2011 at 8:58pm

Biology
I need help in my biology lab... [Catalase Lab] 1.What effect did heat have on the activity of the enzyme? What effect did cold have? Room temperature? 2. What effect did lowering pH (making it acidic) have on the activity of the enzyme? What affect did raising the pH (making ...
Tuesday, February 15, 2011 at 6:21pm

biology
what are the four main sources or causes of disease causing agents?
Monday, February 14, 2011 at 5:18pm

Biology: Why do cells divide?
Which cells in the human body divide most frequently? Why is this? What activities or conditions spur cell division? What slows it down?
Sunday, February 13, 2011 at 10:29pm

Biology
what would you use to get the volume of a an cofee cup?
Saturday, February 12, 2011 at 2:30pm

Biology
(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Account for the difference between the expected and experimental values.
Friday, February 11, 2011 at 11:21am

Biology - Uncertainty (Repost)
I'm doing a bio lab, and I have collected data on heart rate measured in beats/15 secs with an uncertainty of +/- 1 beat/sec. To get heart rate per minute, I multiplied my data by 4, making my uncertainty +/- 4 beats/min. However, what I need to do now is some subtraction...
Thursday, February 10, 2011 at 7:10pm

Biology - Uncertainty
I'm doing a bio lab, and I have collected data on heart rate measured in beats/15 secs with an uncertainty of +/- 1 beat/sec. To get heart rate per minute, I multiplied my data by 4, making my uncertainty +/- 4 beats/min. However, what I need to do now is some subtraction...
Wednesday, February 9, 2011 at 10:32pm

Biology
*distinguish between motif and domain
Wednesday, February 9, 2011 at 12:03am

Biology
If bird DNA is more similar to crocodile DNA than turtle DNA is to crocodile DNA, then... A)birds should be included amoung reptiles B)turtles and birds should be excluded from the reptiles C)the reptiles should be replaced by several new classes D)each of the above represents...
Tuesday, February 8, 2011 at 10:33pm

Biology
All organisms in group 2(birds, fish, mammals, echinoderms, amphibians) except _______ are thought to share a common ancestor that possessed many of the same characterisitcs as the modern lancelets. A)echinoderms B)fish C)amphibians D)birds E)mammals
Tuesday, February 8, 2011 at 10:31pm

Biology
Excluding the echinoderms, all the animals in group 2 (birds, mammals, fish, amphibians) have which of the following characteristics in common? A)protostome embryo, coelom, radial symmetry, dorsal nerve cord B)protostome embryo, no coelm, bilateral, ventral nerve cord C)...
Tuesday, February 8, 2011 at 10:28pm

9th grade biology
How can you tell, using a microscope, that an onion cell has depth?
Tuesday, February 8, 2011 at 5:39pm

biology
using lactose and a ph value of 3,5,7,9,11, Why was there no increase in the reaction rate with 8.0 g. of substrate as compared to 4.0 g. of substrate? What would you need to add to see an increase in the reaction rate with 8.0 g. of substrate?
Tuesday, February 8, 2011 at 10:23am

Biology- DNA
What is needed to synthesize DNA? -a DNA strand -a primer and is that it?
Monday, February 7, 2011 at 11:20pm

biology
how to identify leaves marple.lime,willow,hawthorn rose,rhododendron,birch ivy.oak.sycamore,horse chesnut,holly to make a branch key then turn it into paired statement key
Monday, February 7, 2011 at 6:00pm

biology
Discuss the function of hormone in the reproductive process?
Sunday, February 6, 2011 at 9:51pm

biology
Describe the different types of hormone please help
Sunday, February 6, 2011 at 4:56pm

Biology
Supposing you have a renal stenosis, what kind of affect does that have on the heart. What I do know: - decreased flow to the kidneys - kidneys assumes that overall blood volume have decreased - RNN system is activated - = increase in blood pressure (hypertension) I'm ...
Saturday, February 5, 2011 at 2:14pm

biology
how your specific hormones work and the responce that they elicit(mechanism of action and desired response)
Friday, February 4, 2011 at 10:25pm

Biology
In a cell undergoing meiosis, which sequence of events is shown in correct order? A. the cytoplasm divides, chromosomes line up at the equator, nuclear envelope forms. B. chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the ...
Friday, February 4, 2011 at 3:32am

Biology
what kind of molecule is found in lipitor? is it found in the human body?
Thursday, February 3, 2011 at 8:52pm

biology
how signals are propagated along a nerve?
Thursday, February 3, 2011 at 8:18pm

biology
is my biology paper good so far? Im not done. its about lifestyle disease A lifestyle disease (also called diseases of longevity or diseases of civilization) is an inappropriate relationship between people and their environment that results to having a disease. When you eat a ...
Thursday, February 3, 2011 at 3:58pm

biology
What effect does limiting fat and cholesterol intake have on the body's ability to produce these hormones and how will these manifest?
Wednesday, February 2, 2011 at 7:24pm

biology
On average, what percentage of the cells in an onion root tip are in each of the different phases of the cell cycle? This question is for the purpose of checking lab data.
Wednesday, February 2, 2011 at 7:02pm

biology
Anaphylaxis is especially life threatening because it has the potential to cut off airways and breathing. What is the physiological response that allows anaphylaxis to occur? How and why does epinephrine (also known as adrenaline) counteract this response? Provide detail on ...
Wednesday, February 2, 2011 at 2:46pm

english/biology
I was wondering if you can check to see if these are good predications, hypothesis and questions. Like does the grammer makes and stuff. Thank you Hypothesis : Temperature as one, environmental factor will affect the physiological functioning of the small organism Daphnia. ...
Wednesday, February 2, 2011 at 1:05pm

College Biology
The RBC osmolarity of a patient is 300 mOsm/L and is given 1L of distilled water and starts with 3L of plasma. What is the plasma osmolarity after infusion mixes with plasma but before water enters her RBC? Once infused water equilibrated between plasma nad RBA what is her ...
Sunday, January 30, 2011 at 12:24pm

science:Biology
how can you identify the following living organisms using key bird,goat,dog,lizard,fish
Sunday, January 30, 2011 at 8:58am

Biology
Which of the following 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 cells in asexual reproduction. D)A gametophyte ...
Friday, January 28, 2011 at 4:31am

biology
well i need to know why these equation equals 2Mol the equation is: 116g por litro es 2M and 11.6g en 100mL is 2M
Thursday, January 27, 2011 at 8:53pm

biology
1-What are the various types of blood cells seen circulating within the body and how are they distinguished from each other? What impact do they have on the immune system.
Thursday, January 27, 2011 at 5:52pm

Biology
What is the relationship between an increase in light intensity and photosynthetic rate in leaves from a corn plant? How does this relationship compare with the tomato plants?
Thursday, January 27, 2011 at 1:06am

Biology!!
The lifespan of plants varies depending on genetics and survival strategies. Discuss the adaptive value of annual, biennial, and perennial life spans.
Wednesday, January 26, 2011 at 2:33am

biology
A gene for flower color can have multiple alleles like purple, white, or red. true or false?
Tuesday, January 25, 2011 at 11:45pm

biology
Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable phenotypes of the parents (P1)? a all white b all red c ...
Tuesday, January 25, 2011 at 11:33pm

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