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July 23, 2014

Homework Help: Science: Biology

Recent Homework Questions About Biology

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biology help
What are the regulatory enzymes regulated in the citric acid cycle?
Tuesday, April 16, 2013 at 11:16pm

biology
What are four negative allosteric effectors in the citric acid cycle
Tuesday, April 16, 2013 at 10:09pm

biology
i am researching an article and am having trouble understanding the title. can someone please explain to me in simple terms: Deficiency of a Beta-arrestin-2 signal complex contributes to insulin resistance. so what is a beta arrestin 2 signal complex?
Monday, April 15, 2013 at 1:21pm

Biology
Dinosaurs were reptiles that grew to enormous sizes. What may an evolutionist hypothesize about the oxygen content of the environment during the age of dinosaurs?
Sunday, April 14, 2013 at 10:06pm

statistics
An economist wants to estimate the mean income for the first year of work for college graduates who majored in biology. How many such incomes must be found if the economist wants to be 95% confident that the sample mean is within $500 of the true population mean? Assume that ...
Sunday, April 14, 2013 at 9:41pm

Biology
Dephosphorylation in the transuction process needs: A) protein kinases B) protein phosphatases C) single sugar like glucose D)cabohydrate
Sunday, April 14, 2013 at 6:59pm

Biology
PLEASE HELP!!!! 1. How many millions of years ago did sharks first appear? (Make sure you are looking for animals that only have cartilage skeletons). 2. How many millions of years ago did bony fish (like the perch) first appear? 3. How many millions of years ago did ...
Sunday, April 14, 2013 at 4:39pm

Biology
Fish have a two chambered heart called a single loop. Discuss the benefits and drawbacks of this system.
Sunday, April 14, 2013 at 4:13pm

Biology
Amphibians have a three chambered heart. Discuss the importance of the extra chamber in terms of the obvious physical differences that amphibians like frogs have from fish.
Sunday, April 14, 2013 at 4:13pm

Biology
Reptiles and mammals both have a four chambered heart yet reptiles utilize the sun to monitor body temperature while mammals control body temperature internally. What does this mean about the separation of oxygenated (blood that already picked up oxygen from the lungs) and ...
Sunday, April 14, 2013 at 4:12pm

Biology
Dinosaurs were reptiles that grew to enormous sizes. What may an evolutionist hypothesize about the oxygen content of the environment during the age of dinosaurs?
Sunday, April 14, 2013 at 4:12pm

Biology
Programmed cell suicide occurs when internal or external signals go through _____ processes. Answer a)reception b)transduction c)response d)all of the above
Saturday, April 13, 2013 at 7:38pm

science-biology
Some herbicides, such as 2, 4-D are believed to make plant cells divide more rapidly than normal. Why would this kill plants? Why might this be dangerous to humans if it had the same effect on human cells?
Saturday, April 13, 2013 at 3:19pm

human and social biology
how long does inhaling during exercise take ? and how long exhaling during exercise take ?
Saturday, April 13, 2013 at 2:30pm

BIOLOGY
WHAT IS ASHMA?
Saturday, April 13, 2013 at 10:11am

Biology
Consider this pathway: signaling ligand ¨ G protein-coupled receptor ¨ G protein ¨ adenylyl cyclase ¨ cAMP. Identify the second messenger. Answer: A)G protein B)GTP C)adenylyl cyclase D)cAMP
Friday, April 12, 2013 at 3:35pm

Biology
Humans have about 20,000 genes in our genome. Explain how cells differentiate into different kinds of cells even though they have the same set of 20,000 genes in their nuclei, so they are genetically identical.
Friday, April 12, 2013 at 11:39am

Biology
The body of multicellular animals (salamanders, frogs and so on) is made of more than hundred different kinds of somatic cells. Even though they’re so different, they all have the same genome (the same DNA, the same set of genes). This is called genomic equivalence. How ...
Friday, April 12, 2013 at 11:26am

Biology
Through the process of spermatogenesis __________ sperm are created, whereas oogenesis creates ________ egg(s) and _________ polar bodies.
Thursday, April 11, 2013 at 4:08pm

biology
Which one of the following statements would most clearly refer to a person's genotype?
Wednesday, April 10, 2013 at 7:25pm

math
on a biology test a student answers 25 questions correct but doesnt pass. on second attempt he gets 37 correct. what is the percent of increase
Wednesday, April 10, 2013 at 3:56pm

Biology
Which of the following cranial nerve nuclei is a branchial motor nucleus and is, therefore, found in an intermediate position in the brainstem tegmentum? oculomotor nucleus abducens nucleus dorsal motor nucleus of vagus Edinger-Westphal nucleus nucleus ambiguus
Wednesday, April 10, 2013 at 10:34am

Biology
What type of cell in the central nervous system play an important role in the uptake and processing of neurotransmitters from synaptic clefts? neuron oligodendrocyte microglia endothelial cell ependymal cell
Wednesday, April 10, 2013 at 10:33am

Biology
Which of the following arteries contributes to the anterior circulation of the brain? anterior inferior cerebellar artery basilar artery anterior cerebral artery vertebral arteries superior cerebellar artery
Wednesday, April 10, 2013 at 10:32am

Biology
As should be clear from reviewing the midsagittal plane through the brain, which statement below most accurately describes the components of the ventricular system and/or the circulation of cerebrospinal fluid (CSF)? CSF flows directly from one lateral ventricle through an ...
Wednesday, April 10, 2013 at 10:31am

Biology
Theme A: Surface anatomy of the brain Of the following pairs of directional terms, which pair contains terms that define PERPENDICULAR (orthogonal) directions when applied to the identified region of the central nervous system? in the brainstem, ventral & anterior in the ...
Wednesday, April 10, 2013 at 10:30am

Biology
In conventional human radiological imaging (e.g., MRI, PET, CT) of the head, the axial plane is synonymous with the horizontal plane. Which of the following statements about this plane is most accurate? The axial plane is an axis of symmetry in the forebrain. The long axis of ...
Wednesday, April 10, 2013 at 10:29am

biology/ help please
which part of a neuron in the cerebellum of the brain is the most extensive in terms of anatomical developement? a-hillock region b-cell body c-dendrites d-nucleus e-axon -my answer is axon
Monday, April 8, 2013 at 10:10pm

biology/ help please
which part of a neuron in the cerebellum of the brain is the most extensive in terms of anatomical developement? a-hillock region b-cell body c-dendrites d-nucleus e-axon -my answer is axon
Monday, April 8, 2013 at 6:47pm

Math
John has 4 math books, 6 biology books,, and 8 statistics books to arrange on a shelf. In how many ways can he arrange the books so that books on the same subject are grouped together?
Sunday, April 7, 2013 at 5:24pm

Biology HELP
How would the production of gelatinase help a pathogen be more virulent?
Sunday, April 7, 2013 at 5:05pm

biology
(d) Is this pedigree consistent with sex-linked dominant inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i) If...
Sunday, April 7, 2013 at 9:02am

biology
(c) Is this pedigree consistent with sex-linked recessive inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i) ...
Sunday, April 7, 2013 at 9:02am

biology
(b) Is this pedigree consistent with autosomal dominant inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i) If ...
Sunday, April 7, 2013 at 9:01am

biology
Consider the pedigree below. This pedigree represents a family with a rare genetic disease. Note two very important assumptions: Individuals who marry into the family may carry a disease allele. The disease is completelely penetrant. That is, any individual with a genotype ...
Sunday, April 7, 2013 at 9:00am

biology - environmental
How does the edge (shoreline) of a marsh/wetland affect the wetland? Would it be better for the wetland to have a round or broken shoreline? Are coves, peninsulas and islands important to have? How does the shape affect wave action and exposure to wind?
Saturday, April 6, 2013 at 8:21pm

biology
90% if the released energy during the Krebs Cycle comes from what
Saturday, April 6, 2013 at 4:20pm

Biology
a mother carried the sex-linked gene for color blindness and the father had normal color vision, what would be the probability of having a colorblind son? *using a Punnett Square
Saturday, April 6, 2013 at 1:26am

Biology
What are some of the treatments for coronary artery disease?
Friday, April 5, 2013 at 11:07am

Biology
Explain what happens when a person with AB+ donates blood to a patient with A+ blood type?
Friday, April 5, 2013 at 10:58am

Biology
Explain the role of white blood cells in the body's defense against foreign substances.
Friday, April 5, 2013 at 10:50am

Biology - URGENT Enzyme Lab
Did a catalase producing hydrogen peroxide lab, used manganese dioxide, fresh frozen liver, potato, ice, fine clean sand, etc. Basically just added hydrogen peroxide to the catalysts under diff conditions and stuff. Just dont get this question which is : how do you account for...
Friday, April 5, 2013 at 1:25am

maths literacy,biology,tourism,business studies
what possible careers could i get into with these subjects
Thursday, April 4, 2013 at 1:02pm

Biology
I'm doing a lab for gel electrophoresis and we added the digests in the wells of the agarose gel Lane 2 – λ Hind III (a standard) Lane 4 – Tube 1 Lane 5 – Tube 2 Lane 6 – Tube 3 Lane 7 – Tube 4 Now will DNA in tube 1 which only has dh20, 10x ...
Tuesday, April 2, 2013 at 2:11pm

Biology "Genetics"
Red-green Color Blindness and Hemophilia A are both sex-linked traits in humans. Both genes are on the X-chromosome and are tightly linked. Consider the pedigree below. Individual 1 is homozygous normal. Individual 2 is both red-green color blind and a hemophiliac. Individual ...
Tuesday, April 2, 2013 at 9:39am

biology
) To test linkage between the feather texture and feather color genes you complete a test cross with the F1, and find that the feather texture and feather color genes are linked. Only part of the data from the test cross is given below. Complete the table by giving the four ...
Tuesday, April 2, 2013 at 5:51am

biology
how do chromosomes move inside a cell during each stage of cell division?
Sunday, March 31, 2013 at 9:03pm

biology
Consider the pedigree below. Individual 1 is homozygous normal. Individual 2 is both red-green color blind and a hemophiliac. Individual 6 is the as yet unborn son of 4 and 5. What is the probability that their son, 6, will be both color blind and a hemophiliac? Express your ...
Sunday, March 31, 2013 at 5:48pm

Biology dilutions
This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any help would be ...
Thursday, March 28, 2013 at 9:10am

10 grade algebra
please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a variable for the number ...
Wednesday, March 27, 2013 at 7:06pm

Biology (dilutions)
This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any help would be ...
Wednesday, March 27, 2013 at 3:37pm

Biology
This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any help would be ...
Wednesday, March 27, 2013 at 10:01am

algebra 10th grade
please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a variable for the number ...
Tuesday, March 26, 2013 at 8:41pm

BIOLOGY
The forward primer was provided by the manufacturer as a lyophilized powder. If the manufacturer delivers 127.4 nmoles of this primer, what volume of buffer should you dissolve it in to make a 100 μM stock?
Tuesday, March 26, 2013 at 6:06pm

Biology { PLEASE HELP :D }
From an ATP production viewpoint, use fact B to make a statement regarding the efficiency of fats vs. carbs. Fact b - Carbs bind and store water. The metabolism of water yields no ATP. Fat has no water bound to it.
Monday, March 25, 2013 at 8:22pm

Biology
The original high estimate of the number of protein-coding genes in humans was based partly on the number of different known proteins made by the human organism. How can the small number of genes now thought to be present account for this larger number of proteins synthesized ...
Monday, March 25, 2013 at 5:52pm

Biology
Stem height in the pea plant is one of the traits studied by Mendel. The tall allele is dominant to the short stem allele. What is the probability of a tall offspring if two heterozygous plants are mated? What proportion of the tall offspring is likely to be homozygous?
Monday, March 25, 2013 at 5:51pm

MATHS
in a class of 60 students,the number of students who pass biology is 6 more than the number who pass chemistry.every student passed at least one of the two subject.how many pass in only biology.how many pass in only chemistry.
Monday, March 25, 2013 at 3:20am

biology
Why humans not evolve with one central repository of DNA rather than having it replicated throughout the body?
Sunday, March 24, 2013 at 9:39pm

math
After six biology tests, Ruben has a mean score of 73. What score does Ruben need on the next test to raise his average (mean) to 75?
Sunday, March 24, 2013 at 2:32pm

Biology
Identify the molecules that participate in the light dependant reactions and tell what they do.
Sunday, March 24, 2013 at 2:31pm

biology
Devise a plan to carry out the following growth curve: Seed cells on day -1. Transfer cells to the test media on day 0. From day 0, plan to carry out your growth curve for 10 days. During this time, the cells are to be fed three times (excluding the day 0 medium change), and ...
Saturday, March 23, 2013 at 1:31pm

biology
time day 0 day 1 day 3 day 4 day 5 day 7 count blank 7 10 5 14 9 8 low 45&49 64&70 62&69 75&79 80&82 68&72 high 45&49 72&78 100&112 180&195 250&267 208&226 Calculate the cell yield for the following data that were obtained using a coulter counter. Conditions: machine counting ...
Saturday, March 23, 2013 at 1:30pm

Biology
A bone thickens by A. Activity of osteocytes in the medullary cavity B. increased secretion of calcium salts by osteoclasts C. Adding blood vessels and nerves D. None of the above
Thursday, March 21, 2013 at 8:50pm

Biology
What three things must be known to perform radiometric dating?
Thursday, March 21, 2013 at 6:02pm

Biology DNA
What are the components of DNA and how is the backbone of a single strand of DNA constructed? I put the components as nitrogenous base, deoxyribose molecule, and a phosphate group...I don't know the second part of the question :/
Wednesday, March 20, 2013 at 10:37pm

Biology
What was a event in Darwins life that lead him to the theory of evolution. When i googled it those were the only two that came up. And our teacher told us to not to do those
Wednesday, March 20, 2013 at 7:55pm

Biology
Research and discuss an event in Charles Darwins' life that lead to his theory of evolution. Events could be directly in Charles Darwin's life or could be individuals whose ideas Darwin incorporated into his work. Besides the voyage to Beagle and the visit to the ...
Wednesday, March 20, 2013 at 7:42pm

Biology
What is the main cause of brown or photochemical smog? 1. emissions from aircrafts 2. aerosol cans and coolants 3. emissions from automobiles 4. coal-burning industries 5. river pollution through discharge of industrial wastes
Tuesday, March 19, 2013 at 7:07pm

Biology
Eutrophication refers to 1. the concentration of a toxic substance in the tissues of organisms. 2. depletion of mineral resources as a result of leaching. 3. the warming of the earth’s surface. 4. the damage to the ozone layer that protects the earth from UV light. 5. ...
Tuesday, March 19, 2013 at 6:24pm

Biology
Why is it difficult for a mutation to occur that would change the genetic code?
Tuesday, March 19, 2013 at 2:07pm

Biology
Where is the clitoris situated? What is transpiration? What is the function of Bertholin's Glands? What is the chemical composition of melanin? Where are the testicles situated in the human body?
Monday, March 18, 2013 at 2:32pm

Biology
To take the energy from an exergonic reaction and use it to power an endergonic reaction, a cell can: create the energy for the endergonic reaction to occur. Why is this false? I thought a exergonic reaction create energy for the endergonic reaction to occur?
Monday, March 18, 2013 at 1:13am

biology
Is pore protein = channel protein?
Sunday, March 17, 2013 at 6:26am

Biology-Ecology
Multiple choice What is the ultimate source of energy for most ecosystems, and in what form does the energy leave the ecosystem? 1. plants; animals 2. light; heat 3. plants; heat 4. producers; consumers 5. heat; light
Saturday, March 16, 2013 at 9:01pm

Biology-Ecology
Multiple choice: For a natural ecosystem to be self-sustaining, many compounds must be: 1. converted into new forms of energy. 2. cycled between organisms and the environment. 3. permanently removed from the environment. 4. changed into fossil fuels such as oil and coal
Saturday, March 16, 2013 at 9:00pm

biology
In this problem, 6 amino acids have been randomly selected from the 129 amino acids in lysozyme; they are shown as solid spheres. The remainder of the protein is shown as a cloud of tiny dots. Your task is to find out which of the 6 amino acids are on the surface of the ...
Thursday, March 14, 2013 at 6:45pm

biology
when robert hooke observed cork through his compound microscope , all that he could see were empty chambers. why were hooke's chambers empty
Wednesday, March 13, 2013 at 8:56pm

biology
The Dopamine molecule cannot make ionic bonds. Edit the dopamine molecule so it now can make ionic bonds.
Wednesday, March 13, 2013 at 8:54pm

Biology
Why are simple sugars required for metabolism? What makes them so important?
Wednesday, March 13, 2013 at 4:46pm

biology
The micelle and the liposome are two structures formed by phospholipids in an aqueous environment. They are represented here in cross section. The letters A, B, C, and D represent different regions. Four different molecules are shown below. For each, indicate if it would be ...
Wednesday, March 13, 2013 at 12:58pm

biology
Caffeine is the most widely used stimulant in the world today. This naturally produced molecule is found in popular beverages from coffee to black tea to Coca Cola. Although humans use caffeine to ward off drowsiness, the caffeine produced by plants makes the leaves and seeds ...
Wednesday, March 13, 2013 at 12:56pm

biology
Which of the following bond types is Fexofenadine capable of forming with a suitable partner molecule? Indicate your answer by checking "Yes" or "No" as appropriate. Bond type Can Fexofenadine form this bond? Hydrogen Bond Ionic Bond van der Waals forces As...
Wednesday, March 13, 2013 at 12:53pm

biology
Problem 5: Functional Groups On the structure of MTX below, identify the functional groups that are present by dragging the functional group name listed below onto the appropriate target boxes on the structure.
Tuesday, March 12, 2013 at 5:29pm

biology
Given the part of the molecule shown below, can the underlined atom participate in a hydrogen bond with an approriate bonding partner? −O−−−H −C−H−− −N−−−H −O−H−− −C−&#...
Tuesday, March 12, 2013 at 3:29pm

biology
Allegra is a blockbuster allergy medication that generated over $1.8 billion in global sales in 2004. Allegra, or Fexofenadine, decreases allergy symptoms by inhibiting the action of histamines. Histamines are naturally occurring molecules that are released from some cells ...
Tuesday, March 12, 2013 at 3:15pm

biology
what is the difference between plant and animal cell
Tuesday, March 12, 2013 at 5:49am

math
In a group of 200 high school students, 36 are taking biology, 52 are taking Spanish, and 126 are taking neither biology nor Spanish. If one of these 200 students is to be chosen at random, what is the probability that the student chosen is taking biology but not Spanish?
Tuesday, March 12, 2013 at 4:10am

biology
what is deep time?
Monday, March 11, 2013 at 10:48pm

Biology
A series of laboratory experiments are set up to investigate various aspects of the photosynthetic process in Elodea canadensis, a common species of pond weed which lives underwater. In the experiment a fixed quantity of Elodea canadensis is incubated underneath an inverted ...
Monday, March 11, 2013 at 9:17pm

biology
How might the damming of an river affect an estuary at the river's mouth
Monday, March 11, 2013 at 10:47am

Biology
Given that a cell's structure reflects its function, what function would you predict for a cell with a large Golgi apparatus?
Sunday, March 10, 2013 at 8:24pm

Biology
Describe one benefit of the transpiration stream of a plant:
Friday, March 8, 2013 at 5:12am

biology
Dopamine is a neurotransmitter—a chemical released by nerve cells to send signals to other nerve cells. Activities like sex and gambling increase the levels of dopamine released within the brain. The highly addictive drugs cocaine and methamphetamine mimic the effects of ...
Friday, March 8, 2013 at 5:11am

Biology
Mature phloem is a live tissue,whereas xylem is dead when mature.Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:
Friday, March 8, 2013 at 4:07am

Biology
Explain why a plant needs to move food around,particularly from the leaves to other regions:
Friday, March 8, 2013 at 4:03am

Biology
Explain what is meant by source to sink flow in phloem transport.
Friday, March 8, 2013 at 4:01am

Biology
Functions Store information Copy information Transmit information What is the structure of each molecule
Thursday, March 7, 2013 at 8:53pm

Biology
If the original amount of Carbon-14 is 142 kilograms, how much will the sample weight in 11,400 years?
Thursday, March 7, 2013 at 8:30pm

Biology
Dopamine is a neurotransmitter—a chemical released by nerve cells to send signals to other nerve cells. Activities like sex and gambling increase the levels of dopamine released within the brain. The highly addictive drugs cocaine and methamphetamine mimic the effects of...
Thursday, March 7, 2013 at 10:08am

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