Sunday
May 29, 2016

Homework Help: Science: Biology

Recent Homework Questions About Biology

Biology
A man who has phenylketonuria (metabolic genetic disorder) marries a woman who is heterozygous at that locus. What is the probability that their first child will have phenylketonuria? Plz help asap
Thursday, June 11, 2015 by Summer.

Biology
Describe how the nervous system helps different parts of your body communicate with one another the moment you begin to pet a dog.
Tuesday, June 9, 2015 by Sara

Biology
If a tall plant (TT) is crossed with a short plant (tt), what percentage of the offspring will be short?
Tuesday, June 9, 2015 by Anonymous

Biology
Suggest why Ia and Ib alleles are dominant over Io allele. Why in IaIo genotype, the Io allele is masked
Thursday, June 4, 2015 by Dean

Biology ASAP
1.)Neurons are classified bye the... (Answer) Direction they carry impulses. I think its because the impulses go to different places, to its different neurons. 2.) Your alarm wakes you up in the morning and reminds you to get ready to go to school. Which type of neuron ...
Thursday, May 28, 2015 by Savannah

Evolution/Biology
What does the statement "The environment directs natural selection" mean?
Wednesday, May 27, 2015 by anonymous

Biology
with an example of the peppered moths when they changed color from light to dark due to pollution, what selection pressure is this? disruptive, stabilizing or directional?
Wednesday, May 27, 2015 by anonymous

Biology
Which example best illustrates the difference between a community and a population? A)The two terms are interchangeable, a population IS a community. B)All the people in a town would be a community; all their cattle would be a population. C)All the people in a town would be a ...
Wednesday, May 27, 2015 by Cara

biology
If A represents atomic mass and Z represents atomic number, which of the following describes an atom after a proton is emitted from its nucleus? A. A+ 1, Z + 1 B. A-1,Z-1 C. A+ 1, Z-1 D. A-1, Z + 1 My answer is B.
Monday, May 25, 2015 by sandra

Biology
How a radioactive element will decay over time?
Monday, May 25, 2015 by john

Biology
How can the mass transfer kc and ultrafiltration solvent flux be increased? Select one: a. Another stream of fluid can flow adjacent to the membrane to accumulate solute at the membrane surface b. Another stream of fluid can flow perpendicular to the membrane to accumulate ...
Saturday, May 23, 2015 by Clara

Biology
How does comparing the embryos of different organisms support the theory of evolution? The embryos of all organisms are identical. The stages of development of the embryos of different organisms are extremely similar, thereby suggesting common ancestors. The embryos of any ...
Friday, May 22, 2015 by Sara

Biology
Why was Charles Darwin able to offer a large amount of evidence for his theory of evolution by natural selection? He compiled the fossil record. He collected data for 5 years while traveling around the world. He conducted in-depth experiments with chemicals in England. He ...
Friday, May 22, 2015 by Sara

Biology
Based partially on his comparative studies of the fossils of woolly mammoths and the bones of modern-day elephants, Georges Cuvier proposed several new ideas about the history of life on earth. Which general statement can be made about this example? Through specific studies, ...
Friday, May 22, 2015 by Sara

Biology
Hi, one more question to clarify: How can the mass transfer kc and ultrafiltration solvent flux be increased? Select one: a. Another stream of fluid can flow adjacent to the membrane to accumulate solute at the membrane surface b. Another stream of fluid can flow perpendicular...
Friday, May 22, 2015 by Clara

biology
what is obesity? how to prevent obesity? and how to do a proper diet?
Thursday, May 21, 2015 by elly

Biology
What is the osmotic pressure of the salt solution in reverse-osmosis? Select one: a. An equilibrium state where the amount of solvent passing in opposite directions is equal b. An equilibrium state where the amount of solvent passing in one direction is greater than other ...
Thursday, May 21, 2015 by Clara

English
Which sentence is punctuated wrong. Who borrowed Celeste biology books? Who borrowed Celeste's biology books? Who borrowed Celestes' biology books? Who borrowed Celestes's biology books?
Wednesday, May 20, 2015 by Connor

Biology
Which organ systems help deliver oxygen to body cells? I think that its the enodcrine and lymphatic systems the other choices are A.respitory and excratory B.muscular and immune systems C.respiratory and circulatory systems
Wednesday, May 20, 2015 by Connor

Biology
Which of the following helps explain why fungi are now classified in a separate kingdom from plants? A. The cells of fungi are not surrounded by cell walls B. Fungi are heterotrophs that cannot make food by photosynthesis C. The cells of fungi do not contain a nucleus D. All ...
Tuesday, May 19, 2015 by :)

Biology
A new pesticide that inhibits egg cell development in cockroaches is being widely used in U.S. homes. As predicted, a number of common cockroaches initially declined but is now more common than it was before the pesticide was introduced. Which of the following is most likely ...
Tuesday, May 19, 2015 by :)

biology
How can i Describe the pathway and processes of ingestion,digestion,absorption and assimilation involved when a person has eaten a buttered polony sandwich
Sunday, May 17, 2015 by happy

Biology
How can i describe how a pierce of bread is digested and assimilated into the cells of a human body thanks in advance
Sunday, May 17, 2015 by Lesedi

Biology, agriculture, economics
How much damage in dollars has Tobacco Mosaic Virus caused in the U.S. in recent years? I'm working on a paper, and I've scoured the internet, google scholar, USDA website, the DHHS, Penn Stae and I can't find anything. Need a source to site as well. Any help is ...
Saturday, May 16, 2015 by TMV's US Damages

biology
equation of photosynthesis
Saturday, May 16, 2015 by Mahlako

science or biology
Similarities in the early development of chickens and opossums suggest that these organisms share a __________. I think is common ancestor
Thursday, May 14, 2015 by claudia 2015

biology o science
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? (1 point) Jellyfish fossils are buried deep under the ocean floor, not in land areas where ...
Thursday, May 14, 2015 by claudia 2015

biology
Butane gas (C4H10) is burned to produce carbon dioxide and water vapour. If 12.8 mol of butane are completely burned, how many moles of water vapour are produced?
Monday, May 11, 2015 by Silver

Molecular Biology
How large is the genome of Alcaligenes faecalis?
Saturday, May 9, 2015 by Sarah

biology
how do cardiac action potentials initiated in the human heart
Thursday, May 7, 2015 by eee

biology
the respiratory systems of mammals and birds adapted to maximise the extraction of oxygen from air. How has did this happen.
Tuesday, May 5, 2015 by eed

biology
A toxin from a poisonous mushroom has been identified as a hydrophobic weak acid. It somehow can find its way to the inner membrane of mitochondria where it gets protonated on the outer surface of the membrane but deprotonated on the inner surface of the membrane. It would ...
Thursday, April 30, 2015 by pete

biology
A toxin from a poisonous mushroom has been identified as a hydrophobic weak acid. It somehow can find its way to the inner membrane of mitochondria where it gets protonated on the outer surface of the membrane but deprotonated on the inner surface of the membrane. It would ...
Wednesday, April 29, 2015 by pete

Biology
What is osmosis
Monday, April 27, 2015 by Jeff

ART Check
How would a visual effects designer working on an animated movie with human characters best use knowledge of biology? Knowledge of biology can help the designer to create accurate human features.**** Knowledge of biology can help the designer to create an action packed film ...
Wednesday, April 22, 2015 by koolkid

biology
Does Aspirin do something to the reaction of amylase with starch ?
Monday, April 20, 2015 by shavell

Biology
what is an adaptive radiation
Monday, April 20, 2015 by Anonymous

biology
1.1 The gametophyte generation in a fern plant changes to the sporophyte generation by A.fertilisation B.melosis C.asexual reproduction D.fusion of spores the answer is A.fertilisation right? 1.2 the male cone differs from the female cone in the pine in that A.only the male ...
Sunday, April 19, 2015 by john

Biology
If gametes have only one copy of a chromosome, then do egg cells have only an X chromosome?
Thursday, April 16, 2015 by Anonymous

biology
Certain insect species have become more and more resistant to insecticides. What type of natural selection is this, and how does it differ from the other types?
Wednesday, April 15, 2015 by Madison

biology
Closed head injury: A. involves damage to the cortex, axons, and ventricles. B. reduces the risk of Alzheimer’s disease. C. can result in Parkinsonism. D. involves penetration of an object into brain tissue. I chose C
Monday, April 13, 2015 by phia

biology
__________ is the neurotransmitter released by the taste receptor cells. A. GABA B. Glycine C. Dopamine D. ATP Is it A?
Monday, April 13, 2015 by phia

biology
Which of the following is true of skeletal muscle? A. Contraction of skeletal muscle can alter blood flow through the heart. B. Skeletal muscle contraction produces movements of the body. C. Skeletal muscles pump blood throughout the body. D. Flexion of a skeletal muscle ...
Monday, April 13, 2015 by phia

Biology
Could you potentially use up all of your memory B and T cells for a specific antigen and become susceptible to that antigen again?
Monday, April 13, 2015 by Caroline

Biology, Chemistry
I know how to carry out an absorption spectrum I just need help on how to to prepare my test tubes and what to put in then. I am very confused and any help would be greatly appreciated. THANKS ! You will be given a sample containing an unknown concentration of protein (Bovine ...
Monday, April 13, 2015 by Arooj

biology
How does the plant regulate what is able to enter into the stem of the plant? Does it have something to do with the casparian strip?
Sunday, April 12, 2015 by K

biology/science
What are the biological terms for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens
Saturday, April 11, 2015 by morongwa

biology
(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Account for the difference between the expected and experimental values.
Friday, April 10, 2015 by dk

biology
What is the role that sensors play in the maintenance of homeostasis in the human body?
Friday, April 10, 2015 by Jade

Biology
What are two roles restriction enzymes play in transformation
Wednesday, April 8, 2015 by Avery

Biology HELP
How do you know whether something is homozygous dominant or heterozygous dominant?
Monday, April 6, 2015 by Missy

Biology
Assume you had a round seed garden pea plant and you wanted to find out whether the round seed plant was homozygous or heterozygous. What would you do? (Round is dominant to wrinkled seed)
Monday, April 6, 2015 by Missy

biology
I have to write an essay on about why organ donation should be mandatory in Canada. I need help thinking of arguments. Some that I have thought of are: 1. there is a shortage of organs for transplants 2. it improves the life of the recipient 3. After death organs can be of use...
Wednesday, April 1, 2015 by Mathew

biology
What is relative dating?
Wednesday, April 1, 2015 by stupid

biology
EVOLUTION (fill in the blanks) Natural selection is the BLANK for evolution As a result of natural selection, organisms with more BLANK traits are more likely to BLANK, BLANK, and BLANK on the favorable traits to their offspring. These traits are passed on from generation to ...
Thursday, March 26, 2015 by Lana

biology (fill in the blanks)
Big picture of natural selection/ keep in mind… Natural selection doesn’t move in a BLANK BLANK Natural selection is not a BLANK process Natural selection isn't BLANK; Its all relative to the BLANK. Its from a study form. These are the ones I don't know.
Thursday, March 26, 2015 by Lana

biology
Economists were thinking that if the human population grew unchecked, there wouldn’t be enough living space and food for everyone. What was Malthus’ conclusions?
Wednesday, March 25, 2015 by Ariel

biology
‘Biologists’ suggested that organisms have been around for a long time and can change too. What was Larmarck’s conclusions?
Wednesday, March 25, 2015 by Ariel

Biology
8) Describe the difference between a prosthetic group, cofactor, and coenzyme; provide an example of each.
Tuesday, March 24, 2015 by Ryan

Biology
The metabolic pathways of organism living today evolved over a long period of time- undoubtedly in a step wise fashion because of their complexity. Considering everything you have learned to date about the evolution of life on Earth, put the following in the order in which ...
Monday, March 23, 2015 by Trinh

Biology
Pick the correct answer, and explain why it is correct. If the pressure in the thoracic cavity increases and the pressure in the ventricles due to venous return remains the same, A. Stroke volume will decrease B. heart rate will decrease C. Cardiac output will increase D. ...
Monday, March 23, 2015 by Sarah. (please help)

biology/evolution
many of the orchids alive today have nectar that doesn't have any sugar in it. Why are there presently-living orchids whose nectar lacks sugar?
Sunday, March 22, 2015 by plsss

Biology
What does b-mercaptoethanol do to secretory proteins?If you forgot to add b-mercaptoethanol to a secretory protein, would the protein's migration likely speed up or slow down? Why?
Sunday, March 22, 2015 by Ryan

Biology
What is the phenotype ratio for TTyy X TtYy? Is it 8:8 for tall + yellow to tall + green?
Sunday, March 22, 2015 by Anonymous

Biology
For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you do not add SDS? a)increase molecular weight of protein b) increase concentration of acrylamide c)decrease charge on protein d) increase surface area of ...
Sunday, March 22, 2015 by Ryan

Biology
What does b-mercaptoethanol do to secretory proteins?If you forgot to add b-mercaptoethanol to a secretory protein, would the protein's migration likely speed up or slow down? Why?
Sunday, March 22, 2015 by Ryan

Biology
In anaphase of mitosis, the sister chromatids are separated and pulled to the poles. How do these chromatids, which are only half of a duplicated chromosome, become chromosomes? As I understand it, mitosis produces daughter cells that are identical to the parent cells.
Sunday, March 22, 2015 by Anonymous

Biology
What does b-mercaptoethanol do to secretory proteins?also...If you forgot to add b-mercaptoethanol to a secretory protein, would the protein's migration likely speed up or slow down? Why?
Sunday, March 22, 2015 by Ryan

Biology
3) For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you do not add SDS? a)increase molecular weight of protein b) increase concentration of acrylamide c)decrease charge on protein d) increase surface area ...
Sunday, March 22, 2015 by Ryan

Biology
What does b-mercaptoethanol do to secretory proteins?also...If you forgot to add b-mercaptoethanol to a secretory protein, would the protein's migration likely speed up or slow down? Why?
Sunday, March 22, 2015 by Ryan

Biology
3) For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you do not add SDS? a)increase molecular weight of protein b) increase concentration of acrylamide c)decrease charge on protein d) increase surface area ...
Sunday, March 22, 2015 by Ryan

Biology
I need some help with these questions. I've chosen answers, but I want to make sure if they are correct. 1)Which of the following is an acidic pH? 6 7 8 800 A: 6 None of the above ------------------------------------- 2) Which of the following is directly produced by ...
Friday, March 20, 2015 by Krista

Biology
What does b-mercaptoethanol do to secretory proteins?
Friday, March 20, 2015 by Ryan

Biology
3) For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you do not add SDS? a)increase molecular weight of protein b) increase concentration of acrylamide c)decrease charge on protein d) increase surface area ...
Friday, March 20, 2015 by Ryan

biology
it is not known if a tall pea plant is homozygous or heterozygous (a hybrid). you decide to do a test cross to find out. if there are 40 offspring and 7 out of them are short, what is the genotype of the unknown pea plant? draw a punnett square that represents this cross. ...
Thursday, March 19, 2015 by amy

biology/ chemistry
how do electrolytes affect the formation of micelles?
Tuesday, March 17, 2015 by pan

biology
Hello, I am having trouble with a question on my homework. Even after reading through my notes and textbook I am still not sure what the answer is. I think the answer is the new paramecium is able to reproduce sexually and asexually.Here is the question: After sexual ...
Sunday, March 15, 2015 by Jordan

biology
Hi, This is a question on my biology test review that I don't understand. I think the answer is pine trees, but I'm not really sure. Please help! In a barren terrestrial habitat, which of the following would be an example of a pioneer organism? moss pine trees ...
Saturday, March 14, 2015 by Kaden

biology
how do you calculate dna base pair percentages
Thursday, March 12, 2015 by Zoi

biology
if a fruit fly has 28.8% Adenine, approximately how much guanine will it have? can someone explain this
Thursday, March 12, 2015 by Zoe

Biology 12
The question is asking to calculate the overall energy change in the combustion of ethane (C2H6). This is what I have done: The balanced equation: C2H6 + 6 O2 --> 2 CO2 + 3 H2O (6) 411 + 346 + (6) 494 --> (2) 799 + (3) 459 2466 + 346 + 2964 --> 1598 + 1377 = 5776 = ...
Wednesday, March 11, 2015 by Vikki

Biology
Are the p1 and p2 generations pure breeding?
Wednesday, March 11, 2015 by Mel

Biology
Would an atom of silicon form an ionic bond with an atom of helium? Why or Why not?
Sunday, March 8, 2015 by Taylor

biology
Assuming logistic growth, if I told you there are currently 100 quail on campus, with r=0.1, but that they have greatly exceeded their carrying capacity = K = 50. How many quail will be in the population next generation I don't remember how K factors in
Friday, March 6, 2015 by Kyle

Biology Ms sue
1.which of the following is a renewable resource? (A.wind) B.fossil fuels C.minerals D.land 2.The goal of -----is to use cells and tissues to treat human illnesses or injuries. A.clone (B.therapeutic cloning) C.reproductive D.gene therapy
Wednesday, March 4, 2015 by Samantha

Biology
1.Which of the following is a renewable resource? A.wind B.fossil fuel C.minerals (D.land) 2.The goal of -------is to use cells and tissues to treat human illnesses or injuries. A.clone therapy B.therapeutic cloning (C.reproductive cloning ) D.gene therapy
Wednesday, March 4, 2015 by Samantha

Biology
When talking about Mendel's experiments, can the Parent (P) generation also be called P1?
Tuesday, March 3, 2015 by Anonymous

biology
Pls how can i itemize the blood cells in litres
Monday, March 2, 2015 by diana

biology
Hello, I got this question wrong on a homework assignment and I still can't find the correct answer. The reduction of the chromosome number during meiosis is most important for: 1: keeping the amount of DNA in the cell at a minimum level. 2: allowing the growth of the cell...
Sunday, March 1, 2015 by Tony

biology
hi, I am studying for an exam and I am trying to really understand the processes of things. So, in a cardiac muscle (everything else normal) what would happen if sympathetic stimulation does not lead to the phosphorylation of Troponin-I? I am asking specifically in regards to ...
Friday, February 27, 2015 by jack

Biology
Which of the following situations best shows Darwin’s theory of natural selection as a mechanism for evolution? A. The long neck of a giraffe is the result of its ancestor continually reaching for higher branches. B. The ancestor of the snake had its legs bitten off by a ...
Friday, February 27, 2015 by TayB

Biology
In fruit flies, eyes can be either white or red, and wings can be either long or short. A mating cross between a red-eyed long-winged female and a red-eyed short-winged male produces the following offpsring: 42 red, short 30 red, long 14 white, short 10 white, long Calculate ...
Friday, February 27, 2015 by TayB

Biology
Do you think that the countries producing sulfur dioxide emissions should compensate their neighbors for the damage being done?
Friday, February 27, 2015 by Taylor

Biology - Genetics
What is the expected genotypes and phenotypes of F1 flies in the cross between virgin brown eyed female with scarlet males (genes for brown and scarlet eyes are on different autosomes)? I know that brown eyes and scarlet eyes are both recessive but I'm not sure what he ...
Monday, February 23, 2015 by Annie

biology
what is one advantage of using e. coli to study bacterial growth rates?
Monday, February 23, 2015 by Mai

biology
A pepper plant is heterozygous for a mutant allele of the gene encoding the CaSGR enzyme (one allele is wild type and the other is mutant). The mutant allele differs from the wild type one in that it lacks a large part of the promoter sequence. Predict the following & briefly ...
Sunday, February 22, 2015 by Cole

Genetics biology
A man and his wife both have normal vision, but a daughter who has color blindness can the man sue his wife for infidelity? show the cross help me please, have been lots of people saying no and yes to this
Friday, February 20, 2015 by Mandy

Biology
need help quickly please If barred pattern on chicken wings is a sex linked trait, set up a cross (hen and rooster), in which they the newly hatched chicks can be determined as male or female based on the barred pattern. and Color Blindness is inherited as a sex linked ...
Friday, February 20, 2015 by Ash

biology
A pepper plant is heterozygous for a mutant allele of the gene encoding the CaSGR enzyme (one allele is wild type and the other is mutant). The mutant allele differs from the wild type one in that it lacks a large part of the promoter sequence. Predict the following & briefly ...
Friday, February 20, 2015 by plsss

Biology
describe how a population is thought to evolve through natural selection. Provide an example (specifically, the peppered moth)
Friday, February 20, 2015 by Ryan

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Homework Help: Science