Homework Help: Science: Biology

Recent Homework Questions About Biology

Biology
Ovulation occurs by a surge in the secretion of what hormone? estrogen hormone luteinizing hormone follicle stimulation hormone progesterone hormone Tricky.. I believe its estrogen

Biology , AP Biology
which of the following are autotrophs ? A. plants , some protists and some bacteria B. plants C. plants and some bacteria D. plants and some protists

Biology
Can the same probes be used for both western blots and northern blots?

science/biology
introduction to cane toad

Biology
I was asked to do a question about Ethylene gas and its effect on plants. One of my classmates said that plants cannot produce fruit and seeds without the gas... I know ethylene helps ripen and quicken the speed of the fruit/seeds, but can't the plant do it naturally without ...

Biology
Blockage of the common bile duct would be expected to affect lipid digestion. protein digestion. carbohydrate digestion. nucleotide digestion. cellulose digestion. lipid is the only common sense one?

Biology
Which of the following is NOT a function of the stomach? A. store food B.kill bacteria C. digestion of most foods D. move chyme into the duodenum Tricky help?

Biology
Why do the nuclei of the human white blood cells turn blue in a prepared blood slide?

biology
How does meiosis and fertilization in humans and other sexual reproductive organisms maintain the normal chromosomes number for each species?

Biology
1. In a plant’s stem, the vascular tissue (1 point) is always arranged in rings of vascular bundles. is continuous from the roots to the leaves.*** carriest nutrients up the stem but not down. plays a role in photosynthesis and storage. 2. Many cacti, such as saguaros and ...

Biology
What would happen to other organisms if prokaryotes did not recycle nutrients? Please help, I just need a couple of sentences so I can understand what it means:/ Thanks

Biology
GRey flies are dominant to black flies. Make a cross between two flies expected to have all black offspring:

Biology
How does meiosis and fertilization in humans and other sexual reproductive organisms maintain the normal chromosomes number for each species?

Biology
What is the biological process that results in the production of gametes?

Biology
Each sperm of a tomato plant contains twelve chromosomes. What are the haploid and diploid numbers?

Biology Help Please!
1 ) A temperature-sensitive mutation in the lacI gene of E. coli creates a repressor protein that has wild-type function at 30°, but is a superrepressor protein at 42° (unable to bind allolactose). You test this strain with and without lactose, at two temperatures, for ...

Biology
If plants need oxygen for cellular respiration, then why do plants release oxygen into the atmosphere? More oxygen is produced during photosynthesis than the plant needs for cellular respiration, so the plant needs to release the extra oxygen. Plants need to collect more ...

biology
if a person exercise in a warm environment and if he exercise in a cool environment, will there be any difference between the amount of calorie he will lose?and if,in which environment he will lose more calorie? please explain the reason.

biology
Describe the function of each of the above organelles. In addition, compare each organelle to something else (examples: the nucleus is like a boss because both are in control of something larger)

Biology
I am supposed to make different ligations. These are the stocks I am given: Cut pET41a(+) DNA: 25 ng/ul egfp insert DNA: 7 ng/ul Uncut pET-41a(+)/EGFP recombinant plasmid DNA: 25 ng/ul This is the ligation I am supposed to make: Ligation #1: 1:1 molar ratio pET-41a(+) vector: ...

Biology
I'm sorry but I had to post this question again as I left out the question. In a certain species of plant, the allele to produce green melons (G) is dominant over the allele to produce yellow melons (g). A student performed a cross between a plant that produced green melons ...

Biology
I'm doing a research paper on Plectaster decanus, the Mosaic Sea Star and I'm looking for certain information on its diet. There is little information on the internet about this species so I was wondering what is the general diet of a southern Australian sea star? Also, does ...

Biology
what does it mean for two species to be reproductively isolated from each other??

Biology
What is the effect of of adding more sugar to a solution? What will happen to its consistency?

Biology
In a certain species of plant, the allele to produce green melons (G) is dominant over the allele to produce yellow melons (g). A student performed a cross between a plant that produced green melons and a plant that produced yellow melons. When the student observed the next ...

Biology
Which organelle would you expect to find in the cells of a fern, but not in a flatworm? chloroplast **my choice nucleus ribosome mitochondria

Biology
I'm going as this question again as it seems to far down the list to be answered now. Sorry if this is considered spam.

Biology
We are learning about proteins and their structure, but one thing is confusing me. At what structural point is something considered a protein? Is a protein formed after two amino acids synthesis, or is a protein the whole structure (all four levels) put together? I would think...

Biology
Why might it be difficult to classify some molds as unicellular or multicellular? I'm really confused:/ Can somebody please explain this?

Biology
In the classification of eukaryotes, protsists were once placed in a single kingdom. Briefly evaluate whether this classification system is accurate. Why might it be difficult to classify some slime molds as unicellular or multicellular? I know the first one is innacurate, but...

Biology (High school science)
If non-nucleated cells of meristematic tissue are used for tissue culture, then growth rate will be : a) High b) Average c) Very low d) Growth may not take place. Please help!

Biology
What is considered the most critical function of erythrocytes? the transport of oxygen the transport of carbon dioxide buffering against changes in blood pH assisting in clot formation All of the answers are considered the most critical functions of erythrocytes.

Biology
The normal flow of blood through the heart would be right atrium → right ventricle → lungs → left atrium → left ventricle. right atrium → left atrium → left ventricle → aorta. lungs → right atrium → right ventricle → ...

Biology
Systolic blood pressure is the pressure in veins. pressure in major arteries caused by the contraction of the left ventricle. pressure in major arteries when the heart is relaxing. difference in pressure that causes the pulse. hard im thinking its B

Biology
The major vein that delivers blood from the lungs to the heart is the femoral vein. inferior vena cava. superior vena cava. pulmonary vein. jugular vein.

Biology Honors
Hardy-Weinberg: Within a population of birds, 21 percent of them display the recessive phenotype for a particular trait. What are the allele frequencies for this trait assuming the population is in genetic equilibrium? I'm absolutely confused on this ;l

Biology (Please Help!)
When we spin around in one place and stop, we feel as though we are still moving. This feeling is caused by continued Select one: A. transmission of nerve impulses from cochlea to auditory nerve B. movement of fluid against cochlea C. vibrations of tympanum D. movement of ...

Biology
When we spin around in one place and stop, we feel as though we are still moving. This feeling is caused by continued Select one: A. transmission of nerve impulses from cochlea to auditory nerve B. movement of fluid against cochlea C. vibrations of tympanum D. movement of ...

biology
a)what are the main similarities b/n cholera and typhoid? b)what are the main d/ce b/n cholera and typhoid? c)how can the spread of cholera and typhoid be prevented as far as possible?

Biology
Treehoppers have either purple, or green, or white skin. Other geneticists have determined that: (1) whenever one white treehopper is mated with another white treehopper all the progeny are white. (2) whenever two pure bred purple treehoppers are mated all their progeny are ...

biology
When chromatids separate during anaphase two (in meiosis), do all the maternal and paternal chromatids stay together or do they randomly separate into the daughter cells?

Biology i need your help
list the risks of calcium(Ca) for our health.

Science
Please Check! 1. How does nanotechnology help engineers make products for the future? a. By changing a materials atomic structure, it can be made from elements that are easier to obtain.*** b. By changing a material's atomic structure, its physical properties can also be ...

Science Please Check
Please Check 1. How does nanotechnology help engineers make products for the future? a. By changing a materials atomic structure, it can be made from elements that are easier to obtain.*** b. By changing a material's atomic structure, its physical properties can also be ...

biology assignment
How are cohesion and adhesion properties of water linked to photosynthesis

biology assignment
How are cohesion and adhesion properties of water linked to photosynthesis Assignment: maximum of 3 pages Introduction, main body, conclusion, reference (havard referencing system)

biology
Muscle tissue that is under voluntary control and contains cells with many nuclei is cardiac. skeletal. smooth. cartilage. squamous.

Biology
Which tissue type forms glands? connective epithelial muscle nervous glandular help? hard

Language arts, all right?
(During the break between classes, LEE approaches CHANDRA, who is getting a book out of her locker.) LEE: Hi, Chandra. CHANDRA: Hi, Lee. Are you getting used to this new school yet? LEE (hesitantly): Well, I’m finding my classes all right, but… (whispers) Is it always this...

biology
1.intermediate waters is caused by? 2.deep water currents are important because? 3. water that sinks are? 4.water that rises are?

Biology
Number of ATP by oxidative phosphorylation from a 24 carbon fatty acid? I have 96 because fatty acids go to CoA (2ATP) and the Krebs (22ATP). Glucose has 6C and so you add 2+22ATP and multiply by 4 to get 96. Is this right? If not, how do I figure this out?

Biology
How much ATP energy would you get from a tripeptide that, upon hydrolysis and deamination, makes two acetyl CoA and one pyruvate molecule and undergo aerobic respiration?

biology
what type of cell recognizes cells that have been infected by viruses because the infected cells have viral proteins on their surfaces?

Biology
Compare and contrast between these two plant polysaccharides : starch and cellulose.

Biology
How do I set up a trihybrid punnett square if the cross is TTRRPp x TtRrPp?

Biology
Why do we use dna primer for PCR but RNA primer for dna polymerase in cells

biology
It was observed that due to poor nourishment the average weight of beetles reduced. If this continues in a number of generation, will this feature direct evolution? Explain

Biology
Multicellular organisms use a variety of communication methods to coordinate cell function. Choose ONE of the following examples below and describe the cell-to-cell communication that occurs, and then describe the types of responses that result from this communication. ...

Biology
Define a protein kinase and explain its role in a signal transduction pathway. Then describe what can happen if an organism's cells experience abnormal protein kinase activity.

Biology
Describe the G protein receptor system and the tyrosine-kinase receptor system. Explain how these two systems are similar and how these two systems are different, in terms of structure and function please.

Biology
The Hershey-Chase experiment proved that DNA was the hereditary material because a- radioactive phosphorus in viral proteins was shown not to enter bacterial cells. b- radioactive phosphorus in viral DNA was shown to enter bacterial cells. c- radioactive sulfur in viral ...

Biology
I have a research article about the early advancement of laying times for Flycatchers, a bird species through Europe and Asia. My variables are: - Annual temperature recordings in each study site - The species, flycatcher - Clutch size of the flycatchers - The location of each...

Biology - Evolution
Suppose you grabbed ten seeds from the large number of seeds that were present and planted them in a garden. During the summer you harvest 100 bean seeds from these 10 groups of plants? Would you wee the same distribution of seed size as when you first planted the seeds? ...

Biology
I need help creating a pedigree using this description: Lily is 28 years old. She has a younger brother Nick who has hemophilia and a younger sister, Sharon. Lily's parents are George and Maureen. George has a older brother named Edward and a older sister named Rachel. George'...

Biology
How do ATP and ADP function in capturing and releasing energy?

Biology
Describe what you observed in the hands-on animal behavior lab. What conclusions did you draw from the data? Explain your answer.

Biology
Describe a specific type of chemical or audible communication used by animals to respond to an external stimulus and the resulting change in behavior. Explain how this type of communication may relate to natural selection within a population.

Biology
In one signaling pathway, cyclic AMP (or cAMP) acts as a second messenger in a series of reactions that result in the relaxation of smooth muscle cells in artery walls. Define cyclic AMP and describe the role and properties of a second messenger. Then explain how a medication ...

Biology
Multicellular organisms use a variety of communication methods to coordinate cell function. Choose ONE of the following examples below and describe the cell-to-cell communication that occurs, and then describe the types of responses that result from this communication. ...

Biology
Define a protein kinase and explain its role in a signal transduction pathway. Then describe what can happen if an organism's cells experience abnormal protein kinase activity.

Biology
Explain how cell membranes and their components participate in intercellular signaling. Give a specific example of cell membrane involvement in one particular type of cellular signaling.

Biology
Describe the G protein receptor system and the tyrosine-kinase receptor system. Explain how these two systems are similar and how these two systems are different, in terms of structure and function please.

Biology
The single defining characteristic of the mammals is the presence of? mammary glands. a placenta. hair. warm blood. a skul

Biology
1.,you drink salty beverages (clams to) and eat pretzels all day. At the end of the day your weight is way up. Why? I think it has something to do with the fact that our cells shrink in size ? I have no clue? 2. Athletes drink Gatorade . Why? Given the description, tell the ...

Biology
1.,you drink salty beverages (clams to) and eat pretzels all day. At the end of the day your weight is way up. Why? I think it has something to do with the fact that our cells shrink in size ? I have no clue? 2. Athletes drink Gatorade . Why? Given the description, tell the ...

Biology
What can happen to our virtual finch population if the weather changes between wet and dry conditions too rapidly? A- The mutation rate may fall to zero. B- The distribution of beak sizes may cease to be bimodal. C - The finch population may go extinct. D - Beak size may cease...

Biology
Why is coelom considered to be an evolutionary advantage

Biology
A person in Flint Michigan, has severe DNA damage due to heavy metal comtaminated water and the person is still alive. The doctors are now seeing tumors develop. Give two reasons, related to tumor suppression, DNA replication or some other topic covered to date in this class ...

Science/Biology
the vessels that contain the largest volume in the vascular system are? I think Arteries

biology
I got a biology project that's about the excretory system & I have to write the word excretory & draw pictures inside of the word that compares it to real life. What pictures can something be compared that involves with the system?

biology
given the inefficiency of two of the pathway shown in figure 9-4 what advantage could there be to using these pathway to produce energy?

Science/biology
A 62 year old man experiences sudden onset of difficulty breathing, followed by double vision, and later by abnormal kidney and liver function tests. Of the following conditions, which is most likely the cause of his problems? A. Vasculitis​​ B. Raynaud's ...

biology
hi. I would like to know in reference to wind and insects moving pollen to different species of flowers at the same time, why doesn't pollen in one species fertilize egg of a second species thus forming hybrids?

biology
the amount of energy needed to start two reactants to form a product is?

SCIENCE
jamal's neighbor tells him that there are more bacterial cells than human cells in his body. which of these is the best reason that jamal should question his neighbors statement? a. jamal is older than his neighbor b. jamal does not like his neighbor very much. c. his neighbor...

Science Help
jamal's neighbor tells him that there are more bacterial cells than human cells in his body. which of these is the best reason that jamal should question his neighbors statement? a. jamal is older than his neighbor b. jamal does not like his neighbor very much. c. his neighbor...

BIOLOGY - HELP URGENT!!!!
How do the following terms relate to one another with respect to a single genetic locus? - Wild Type Allele(s) - Mutant Allele(s) - Gene Product(s) - Population - Genotype - Phenotype - Dominant Allele - Recessive Allele - Individual - Number of different alleles

Very quick question biology
I'm working on a biology project where I must make a molecule of glucose. I have finished my molecule but I want something in the middle of it which is the "centrepiece ". Can anyone give me any ideas of some things glucose is found in (food) in which I could easily find the ...

Science
1. How does nanotechnology how engineers make products for the future? A. By changing a materials atomic structure, it can be made from elements that are easier to obtain. B. By changing a materials atomic structure, it's physical properties can also be changed. C. By changing...

biology
A positive control group contains the dependent variable under study. true or false i guess it's true

Biology please assist
1. Where is pH found? 2.what is the function of pH? 3.what principle guides the phenomenon of pH? 4.what is acid rain ?how is it related to pH values?

Biology
Draw map of nigeria and indicate the local biomes in the different state

biology
In which part of the body are the crypts of Lieberkuhn?

Biology - Please check?
How does artificial selection differ from natural selection? (Free response) Here is what I wrote: While both of these selections have to do with breeding, artificial selection (same as selective breeding) is where either plants or animals are intentionally bred for scientific...

Biology
1.) Prophage occurs when a.) It bonds with carbohydrates to create a virus b.) Bacteriophage DNA embeds itself in host DNA c.) It detaches from carbohydrates to create a virus. d.) Bacteriophage DNA detatches itself from host DNA. D.

science/biology (cladogram)
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram? don't understand this how do I write this???? help!!!!

Biology
MEIOSIS 1)name the process unique to meiosis that occurs during bivalent formation that may increase genetic diversity? 2)how are sister chromatic made and what is the structure that holds them together? 3)what do we call package of genetic information (DNA), encoding a ...

Biology
How do mutations that alter the nucleotide sequence of a promoter influence the original function of that promoter and thus the entire cell? (Try to name all the biological consequences of possible mutations in the promoter.)

Biology help!!
what compounds (fats, starch, protein and simple sugar) do the following foods have? Oatmeal Margarine Salmon Whole milk Chocolate chip cookies Peach

Study Guide
Does anyone know where I could find an online or PDF version of the Holt Biology 2004 study guide?

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Homework Help: Science