Wednesday
August 27, 2014

Homework Help: Science: Biology

Recent Homework Questions About Biology

Post a New Question | Current Questions

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

Biology
Which of the following bond types is Testosterone capable of forming with a suitable partner molecule? Indicate your answer by checking "Yes" or "No" as appropriate. Hydrogen Bond Ionic Bond van der Waals forces As a whole, is the Testosterone molecule: - ...
Thursday, March 7, 2013 at 9:51am

Biology
Muscle are made up of muscle functions called____ ____. Its two words... I was thinking myosin and actin , however, not sure if i AM CORRECT.
Thursday, March 7, 2013 at 2:51am

Biology
all members of a particular species that live in the same area are called.... plz help me i think the answers is population.. is that right??????
Wednesday, March 6, 2013 at 7:13pm

General Biology
Darwin used which of the following terms to describe the process by which those individuals that possess superior physical, behavioral, or other attributes are more likely to pass their traits to the next generation?
Tuesday, March 5, 2013 at 2:07pm

biology
I nead a list of diseases thats a failure to homeostasis.
Tuesday, March 5, 2013 at 7:58am

Biology
1-how do the parts of the respiratory system worj togather? 2-how does the respiratory system work with other body systems? 3- which body system helps Respiratory system bring oxygen to body? A- circulatory B- excretory C- digestive D- muscular
Monday, March 4, 2013 at 10:15am

biology
for a lab it says prepare a 300 ml of .2% sodium bicarbonate solution. I am trying to find how many grams of NaHCO3 i need. so i did 300ml X .002 and got .6ml of NaHCO3. but how do I convert that to grams of NaHCO3
Saturday, March 2, 2013 at 2:37pm

Biology
Distinguish between breathing and respiration , i wrote: Breathing is the process of taking in oxygen and eliminating carbon dioxide. Respiration is the breakdown of oxygen in the body- although both are needed for all living organisms Is this true? If not may you please fix ...
Saturday, March 2, 2013 at 12:44pm

biology
Think of diets from an energy perspective. Where is the energy coming from, and how many organisms does it move through before it gets to the human? In what form is most of the energy in when it gets to the human, and how is that energy unleashed by the body?
Friday, March 1, 2013 at 8:46pm

biology
Apply the Law of Conservation of Energy to food. Trace the energy from its beginning point, to the point where it was stored or used.
Friday, March 1, 2013 at 8:45pm

biology
Apply the concept of RESPIRATION. What happens inside of a human being when he or she eats various foods? During Respiration, is the energy in the food converted into heat, or into some other chemical (name the chemical!)
Friday, March 1, 2013 at 8:43pm

BIOLOGY
The gastrointestinal phase of gastric secretion:? a. is controlled by the entrance of acidic chyme into the duodenum. b. leads to increased gastric secretion if duodenal pH falls below 2. c. only stimulates gastric secretion. d. will decrease gastric secretion when gastrin is ...
Friday, March 1, 2013 at 4:29pm

Biology
Why mitochondrion and mitotic division are absent in prokaryotic cells?
Friday, March 1, 2013 at 2:11am

Biology
Why mitochondrion and mitotic division are absent in prokaryotic cells?
Friday, March 1, 2013 at 2:11am

biology
what happens to the UTR during RNA processing?
Thursday, February 28, 2013 at 10:12pm

biology
What do multicellular genomes spend a larger proportion of their sequences on (in terms of enhanced complexity)?
Thursday, February 28, 2013 at 10:11pm

biology
what specific stage during the cell cycle does random fertilization occur?
Thursday, February 28, 2013 at 10:11pm

biology
What is the ploidy (haploid/diploid) level and how many sister chromatids are there in your own cells during anphase I, anaphase II, and telophase II (includes cytokinesis)?
Thursday, February 28, 2013 at 10:10pm

biology
Briefly describe the structure and function of three different cellular systems that combine proteins along with necessary RNAs to catalyze covalent bond formation and/or hydrolysis reactions (i.e., function as ribozymes)?
Thursday, February 28, 2013 at 10:09pm

biology help plz?????????????????
Complete the following paragraph relating to the enzyme, β–galactosidase. This enzyme hydrolyses the disaccharide lactose to constituent monosaccharides, galactose and glucose. Drag and drop the appropriate words into the correct space. For white spaces in the ...
Thursday, February 28, 2013 at 9:11am

biology
The frequency of the sickle cell disease in parts of Central Africa is as high as 10 percent compared to a frequency of .5 percent in the US. Use the percentages for the Central Africa population and the US population to calculate the frequency of the heterozygous and ...
Wednesday, February 27, 2013 at 8:22pm

Biology
When does DNA synthesis occur???
Wednesday, February 27, 2013 at 11:37am

biology
what characteristics appear to show consistent development over the 4 million years of hominid evolution?
Tuesday, February 26, 2013 at 10:12pm

Biology
When cells increase in size, the surface area to volume ratio decreases. But which surface area to volume ratio is better to the cell as well as to the organism? The larger or smaller ratio?
Tuesday, February 26, 2013 at 2:10am

Biology
Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds Im clueless!!!
Monday, February 25, 2013 at 10:41pm

biology
Why are the subclavian vein and subclavian artery positioned where they are relative to each other?
Monday, February 25, 2013 at 6:27pm

finance
You have chosen biology as your college major because you would like to be a medical doctor. However, you find that the probability of being accepted to medical school is about 6 percent. If you are accepted to medical school, then your starting salary when you graduate will ...
Monday, February 25, 2013 at 3:55pm

biology
In a chorus of male frogs of one species, which would be considered by evolutionary biologists to be the fittest? The biggest frog. The frog that has the most descendants. The frog with the largest territory. The loudest frog. The frog that attracts the most females. I am ...
Sunday, February 24, 2013 at 9:46pm

biology urgent
In mice, a gene controlling coat colour has 2 alleles; B (black) and b (white). A pure breeding black mouse is crossed to a white mouse and all the offspring are black. The offspring are then crossed to white mice. The phenotypes of the offspring of this second cross are ...
Sunday, February 24, 2013 at 9:39pm

Biology
Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds
Sunday, February 24, 2013 at 8:53pm

Biology
Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds Im clueless!!!
Sunday, February 24, 2013 at 5:25pm

biology
Describe human dispersal, animal dispersal- eating, hook on fur and bursting. Also how they are adapted.
Sunday, February 24, 2013 at 2:57pm

biology
Can a snail survive in an aquarium with no living plants in it? What do fish owners do to compensate if their aquarium has no plants?
Saturday, February 23, 2013 at 6:41pm

biology
27. Pretend you are a carbon atom that was part of a molecule of CO2 dissolved in the water at the beginning of the experiment. Describe a path you could take through both organisms in this experiment, including the molecules you would be a part of and the chemical reactions ...
Saturday, February 23, 2013 at 6:30pm

Biology
Please Help Quick,Write Out The Balanced Chemical Equation For Respiration In An Athlete In A Race.
Friday, February 22, 2013 at 9:01pm

Biology
What results in the combination of the haploid sets of chromosomes from two individuals into a diploid zygote
Friday, February 22, 2013 at 7:40pm

Biology
What results in the combination of the haploid sets of chromosomes from two individuals into a diploid zygote
Friday, February 22, 2013 at 6:22pm

Biology
Which disorder causes a natural immunity to Malaria?
Friday, February 22, 2013 at 5:17pm

Biology
1) What memory system is sensation responsible for? Sensory, short term or long term memory system? Explain. 2) How does encoding memories relate to transfer appropriate processing and fluid intelligence?
Friday, February 22, 2013 at 1:26pm

biology help?
We anticipate the evidence gathered by you will indicate that three of the five species are in greater need of prioritising for conservation compared with the other two. You should start your account by very briefly explaining why these two species were considered to be of ...
Thursday, February 21, 2013 at 4:02pm

Psychology/Biology Help!!
1) What memory system is sensation responsible for? Sensory, short term or long term memory system? Explain. 2) How does encoding memories relate to transfer appropriate processing and fluid intelligence?
Thursday, February 21, 2013 at 12:16pm

Biology
What kinds of substances could interfere with the Dische's test for DNA? I'm wondering if proteins can interfere with this. Please help me
Wednesday, February 20, 2013 at 6:57pm

biology helppppppppppppppp
(This homework question has been removed due to a copyright claim submitted by The Open University.)
Wednesday, February 20, 2013 at 12:20pm

Biology
Please Help Quick,Under Anaerobic Condition,Explain What Happens To Glucose In Yeast And In Humans?
Wednesday, February 20, 2013 at 5:22am

Statistics
In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 15% of your total grade, each major test is worth 22.5...
Tuesday, February 19, 2013 at 5:06pm

SCIENCE Biology (urgent)
1.Do organisms benefit from being classified as a different species?How? 2.Importance of classifying organisms.. I;m not good in science...
Tuesday, February 19, 2013 at 6:36am

biology
People with a lactose intolerance are able to take products such as Lactaid that contain the lactase enzyme with their meals. These products can be taken in pill form. Considering the fact that the pill form of the enzyme would have to travel through the person's stomach, ...
Sunday, February 17, 2013 at 9:57pm

biology
substrate concentration and pH affect enzyme activity. Is there another environmental condition you think could affect enzyme activity How would you test your hypothesis?
Sunday, February 17, 2013 at 8:10pm

biology
30. Enzymes function most efficiently at the temperature of a typical cell, which is 37 degrees Celsius. Increases or decreases in temperature can significantly lower the reaction rate. What does this suggest about the importance of temperature-regulating mechanisms in ...
Sunday, February 17, 2013 at 8:09pm

Biology
How is the anaerobic energy system not entirely anaerobic?
Sunday, February 17, 2013 at 7:36pm

biology
What is the name of the instrument use in measuring Ph slope,depth of water,hydrogen ion concentration.
Saturday, February 16, 2013 at 4:49am

biology
what is a full citation guide of an article?
Saturday, February 16, 2013 at 2:03am

biology help?
In 1857, Louis Pasteur discovered that yeast is a living organism. The activity of yeast causes fermentation – baker’s yeast, Saccharomyces cerevisiae, has been used for centuries in the production of bread, beer and wine. In the absence of oxygen, yeast is able to ...
Friday, February 15, 2013 at 4:51am

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Search
Members