Thursday
September 29, 2016

Homework Help: Science: Biology

Recent Homework Questions About Biology

Biology
Tay-Sachs disease is a hereditary disease that kills 1 in 360,000 individuals in the general population. Individuals homozygous for the defective allele have Tay-Sachs disease and die at an early age.Studies show that heterozygous individuals have a higher rate of survival ...
Friday, November 13, 2015 by Alexander

Biology
A recessive sex-linked allele (h) located on the X chromosome increases blood-clotting time, causing hemophilia. a. With the aid of a Punnet square explain how hemophilic offspring can be born to normal parents? My work: Hemophilic offspring could be born to normal parents ...
Friday, November 13, 2015 by Alexander

Biology 30
For ABO blood groups in the humans, the A and B genes are codminant. Both A and B are dominant over O a. Identify the possible blood types in the children of a man with blood type O and a woman with blood type AB. My work: The possible blood types that the children could have ...
Friday, November 13, 2015 by Alexander

Biology
How do nucleotides and hydrogen bonds affect the structure of DNA? Maybe something like nucleotides make up DNA and hydrogen bonds hold the nitrogenous bases together?
Friday, November 13, 2015 by Lana

Biology
What does it take to be a living organism? Living things share 8 characteristics that are listed in Chapter 1 of your textbook on page 19. Think of an organism or cell in which all 8 characteristics are not obvious. For example, coral looks like it does not move, red blood ...
Friday, November 13, 2015 by Pulasthi

biology
3. A cylinder and an airtight piston are used in the following experiment. The piston is pushed up and down in the cylinder and the resulting pressure of the air inside the cylinder is measured with a pressure gauge. The results of the experiment are recorded in the following ...
Thursday, November 12, 2015 by kado

William Pescod High School
History, tourism, biology and mathematical literacy What can I become with these subjects?
Thursday, November 12, 2015 by Mahmood

Biology
What is formed when water molecules breaks apart?
Wednesday, November 11, 2015 by Aly

pre algebra
in a math class with 31 students 27 earned a passing grade in a biology class with 21 students 17 earned a passing grade... what fraction of the math students earned a passing grade
Tuesday, November 10, 2015 by tiawannnia

biology
Which of the following processes releases energy to be used by a cell? a phosphate group is added to ATP to form ADP. a phosphate group is removed from ADP to form ATP. a phosphate group is added to ADP to form ATP. a phosphate group is removed from ATP to form ADP. not sure ...
Monday, November 9, 2015 by anna

biology
How can i get air in a bag, into a beaker of solution?
Thursday, November 5, 2015 by rose

Biology
If 25 individuals were alive in 1955 and 500 existed in 2013, what is r? Show work please! a) 475 b)2.99 c)0.052 d)0.029
Thursday, November 5, 2015 by Need Help Urgent

Biology (or math)
What is the surface area to volume ratio of a cube with a with of 4 cm. I think its 1.5:1
Thursday, November 5, 2015 by Joe

Biology (bobpursley)
1) Describe how comparing the anatomy of living species provides evidence of evolution. A: Comparisons of the anatomy of different types of organisms often reveal basic similarities in body structures even though the structure's functions may differ between organisms. For ...
Wednesday, November 4, 2015 by Victoria

Biology (CHECK)
Describe how comparing the anatomy of living species provides evidence of evolution. A: Comparisons of the anatomy of different types of organisms often reveal basic similarities in body structures even though the structure's functions may differ between organisms. For ...
Wednesday, November 4, 2015 by Victoria

Biology (Answer Check)
State how comparing the amino acid sequence of a protein can provide evident that evolution has taken place. A: If evolution has taken place, then, in general, species descended from a recent common ancestor should have fewer amino acid differences between their proteins than ...
Wednesday, November 4, 2015 by Victoria

Biology
Which of the following is a NOT function of a vacuole? packing of materials transport of materials storage of materials breakdown of materials I'm confused. I know that vacuoles store materials, in other words, C is not correct since it's true. But the rest are wrong ...
Tuesday, November 3, 2015 by SkatingDJ

Biology
Will a channel protein allow any molecule to pass through it
Tuesday, November 3, 2015 by Geo

Biology
What must a cell membrane have imbedded in it to allow facilitated diffusion to happen
Tuesday, November 3, 2015 by Geo

biology
Determine the effective population size of the current population located on an island. You conduct a census and determine there are about 1500. -Your initial survey indicated that there are 500 juveniles (Smaller, with no horns) on the island. What would you consider the ...
Saturday, October 31, 2015 by John

Biology
Needed to transport proteins and lipids throughout cytoplasm. Must be able to work within complicated membrane passages. Some positions involve work with ribosomes
Saturday, October 31, 2015 by Anonymous

english
eaping upstream, we fished most of the day for salmon. At the age of ten, my family took a trip to Washington, D.C. Skimming every chapter, the biology textbook made more sense. I need help with Dangling modifiers. We fished most of the day for salmon that were leaping ...
Saturday, October 31, 2015 by Jennifer

English
Are these correct sentences: Leaping upstream, we fished most of the day for salmon. At the age of ten, my family took a trip to Washington, D.C. Skimming every chapter, the biology textbook made more sense. I need help with Dangling modifiers.
Friday, October 30, 2015 by jennifer

Biology
Explain the processes that take place in the stroma including the reactants going in and the products produced from these processes in (a) bright sunlight and in (b) darkness. (c) What happens over an extended period of darkness of many days? I don't understand this I didn...
Friday, October 30, 2015 by Anonymous

biology
I allow things to enter and leave the cell. if I don't think you're helpful to the cell I wont let you in. Who am I?
Thursday, October 29, 2015 by Clarissa

Biology
what do the following do in a cell: Smooth endoplasmic reticulum Mitochondrion Ribosomes Golgi apparatus Nuclear envelope
Thursday, October 29, 2015 by Anonymous

Biology
A horse breeder has a black horse named Luca and he isn't certain about the horse's genetics. A purebred horse will be worth much more than a hybrid horse so he compiled all the information about the Luca and Luca's parents before approaching you. - Black is the ...
Thursday, October 29, 2015 by Anonymous

Biology
There are at least 4 different ways that humans have genetic variation, a. Using one of these four ideas explain why you do not look like another person in this room. b. To continue further with this thought use another one of the genetic variation ideas and explain why you ...
Thursday, October 29, 2015 by Judy

mathematics
in a class of 60 students, the number of students who passed biology is 6 more the number of student who passed chemistry. Every student passed at least 1 subject and 8 passed both subject. How many passed chemistry
Thursday, October 29, 2015 by conan

Biology
What are good ways to remember what the Cytoplasm, Golgi apparatus, vesicles, etc do? I have a hard time remembering all the cell organelles
Wednesday, October 28, 2015 by Geo

Biology
Some people experience “heartburn” when eating fatty, greasy foods (similar to the effect that is felt when eating acidic foods). Why would this occur with fats? I know fatty acids are made of carboxylic acid and if you have too much, would it make sense to say that ...
Tuesday, October 27, 2015 by Charles

Biology
The name of each job is writte in CAPS. Match each wanted ad to the cell organelle that should be getting that job. Write the name of the job, followed by the name of the organelle Are you permeable? Are you all about homeostasis? GUARD needed to regulate transport of water, ...
Monday, October 26, 2015 by Geo

Biology
The name of each job is writte in CAPS. Match each wanted ad to the cell organelle that should be getting that job. Write the name of the job, followed by the name of the organelle 1. Is green your favorite color? Do you like working only with plants? Be a valuable part of our...
Monday, October 26, 2015 by Geo

Biology
Word box : Synthesis, Lysosome, Enzymes, Mitochondrion, Cristae, self replicate, centrioles, nucleus, DNA, nucleolus, mitosis 1. The _____ inside the cell's control center are the instructions for a cell DNA? 2. During ____ the cell divides forming two identical daughter ...
Monday, October 26, 2015 by Geo

Biology
Word box : eukaryote, prokaryote, cytoplasm, cell membrane, semipermeable, cytoskeleton, endoplasmic reticulum, ribosomes, Golgi apparatus, vesicle 1. ______ are the site of protein synthesis Ribosomes? 2. When DNA is not surrounded by nuclear membrane the cell is a ____ ...
Monday, October 26, 2015 by Geo

Biology
The LEPR gene that encodes for the leptin receptor protein is approximately 23 kilo base pairs long. The receptor protein consists of 896 amino acids. A man has a mutation in an LEPR allele. Analysis of his DNA sequence for this lepr allele shows that there is a 5' GTA to ...
Monday, October 26, 2015 by Christine

biology please help bobpursley
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...
Sunday, October 25, 2015 by Jennifer

Biology Help PLEASE
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...
Sunday, October 25, 2015 by Jennifer

Biology Answer Check
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...
Sunday, October 25, 2015 by Jasmin

Biology Answer Check !!!!
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...
Sunday, October 25, 2015 by Brain

Biology Answer Check
Which of the following describes the classification of humans? A. The genus Homo and the species sapiens B. The phyla Homo and the species sapiens C. The family sapiens and the genus Homo D. The class sapiens and the genus Homo i think its A Correct or Incorrect . if so which ...
Sunday, October 25, 2015 by Jasmin

Biology Answer Check
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...
Sunday, October 25, 2015 by david

Biology
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heterozygous plant (Tt) is crossed with a homozygous tall plant? A. 100% B. 75% C. 50% D. 25% i think its A because ...
Sunday, October 25, 2015 by samantha

biology
Which of the following statements best explains the relationship between the mitochondria and the plasma membrane? A. The mitochondria makes proteins that become a part of the plasma membrane. B. The mitochondria makes a gas that the plasma membrane uses. C. The mitochondria ...
Sunday, October 25, 2015 by john

Biology
How does chloroplasts move when placed in a different solution? I understand that chloroplasts are just randomly scattered through out the cytoplasm, but what does placing the cell in a different solution that can be hypotonic or hypertonic affect the placement of chloroplasts?
Saturday, October 24, 2015 by Lily

Biology ASAP
All I need is pretty much an analogy for the Smooth and Rough ER in a house.
Friday, October 23, 2015 by Derpy Pegasus

Biology
What's the difference between the Smooth and the Rough ER? Can you help me apply them to, say a house? Like for example, the living room is the nucleus, and the mitochondria is a generator? It's the last part in my bio project. Thanks in advance, Derpy Pegasus
Friday, October 23, 2015 by Derpy Pegasus

science, biology
1. What is/are the main factor(s) that determine(s) that your plants will grow into bean plants (or other fast-growing plants that you used for your experiment) and not some other type of plant (genetics, environment, or both)? Explain your answer.
Thursday, October 22, 2015 by kat

Regents biology
Baby chickens require a constant source of food.As chick's grow,more energy is required for daily activities.The following table gives the grams of food eaten by a chuck over a five day period:
Wednesday, October 21, 2015 by Jorge

biology
The American curl is a breed of cat that has curly ears. The allele for curly ears is dominant. Suppose a male cat with the heterozygous genotype is bred to a female cat with the homozygous recessive genotype. Predict the number of kittens that will have the phenotype for ...
Wednesday, October 21, 2015 by marie

Biology
How much sterile saline would you have to add to add to 0.25 mL of a serum sample in order to prepare 1/50 dilution of the serum?
Tuesday, October 20, 2015 by Tony

Biology
Is cooking oil healthy why or why not and are proteins more or less nutritious than fats why or why not?
Monday, October 19, 2015 by Daniela

HELP AP BIOLOGY
How would the results of the experiment be affected if you were sloppy and sometimes did not dry off the outside and/or ends of the dialysis bags prior to determining their masses? explain why this would matter.
Sunday, October 18, 2015 by Anonymous

Biology
What holds nitrogen bases together in a Double Helix? (DNA)
Saturday, October 17, 2015 by Anonymous

Biology
What do Nucleotide Chains create
Saturday, October 17, 2015 by Anonymous

Biology
Which features are common to all cells? Check all that apply. All cells have cytoskeleton lysosomes vacuoles the cytoplasm flagella and fimbriae photosynthetic membranes the plasma membrane ribosomes the cell wall genetic information (DNA) in chromosomes chloroplasts the ...
Saturday, October 17, 2015 by Anonymous

Biology
What are three sub unites or parts of a nucleotide
Saturday, October 17, 2015 by Anonymous

Biology
What are the four nitrogen bases of a DNA nucleotide
Saturday, October 17, 2015 by Anonymous

biology
A researcher wanted to know how many fish were in a dam.He caught 20 fish and marked them by clipping out a small section of their tail fins.He then released them back into dam.A few days later he caught 25 fish and found that 8 had been marked 1.estimate the total number of ...
Friday, October 16, 2015 by jeremy

biology
In an investigation to find the number of african potato plants in a field of area 6 000m^2 three plots were selected.each with an area of 10^2.Pot 1 contained three and the other plots contained seven and two african potato plans,respectively. 1.name two advantages of ...
Friday, October 16, 2015 by nicole

Biology
Cite a way the excretory system helps maintain homeostasis, besides removing wastes,water,carbon dioxide, and salts.
Wednesday, October 14, 2015 by Cassie

biology
why is anaphase the shortest stage in the cell cycle?
Wednesday, October 14, 2015 by alyssa

HELP HELP AP BIOLOGY
A. Explain the term "concentration gradient". Make sure to discuss the difference between a solution's concentration and a concentration gradient. B. An artificial cell contains 0.2 M FRUCTOSE and 0.8 M glucose, AND 2M SUCROSE. It is placed into a solution ...
Sunday, October 11, 2015 by Anonymous

Biology
I put them in order, but am not sure. Please take a look? Question: Put the following events of the adaptive immune response in the order they occur. (c) You cut yourself and bacteria enter the wound. (f) A dendrite near the cut phagocytizes some bacteria and uses MHC proteins...
Friday, October 9, 2015 by Anonymous

biology
why did dinosaurs evolve earlier than humans?
Friday, October 9, 2015 by mark

Biology
In phylogenetics, we use the terms monophyletic, polyphyletic, and paraphyletic. What do each of these terms mean? How might the concept of shared, derived traits fit with these terms? I know what each of the terms mean. I am not sure about the second question.
Thursday, October 8, 2015 by Sarah

Biology
List 3 differences between eukaryotic and prokaryotic genomes. Describe how one of these differences might impact laboratory applications. What are two issues that might arise when genetically engineering a prokaryotic cell to express a eukaryotic protein. I know three ...
Thursday, October 8, 2015 by Ana

Biology
The function of diastase and how it is affected by temperature. I got the function.. but i dont know how temperature affects diastase
Thursday, October 8, 2015 by Rose

Biology
What are the three conditions that must be met for natural selection to occur? What should happen if those three conditions are met? Define each type of natural selection, and describe what you expect to happen over time if these types of natural selection occur. Do these ...
Thursday, October 8, 2015 by Sarah

Biology
Why is the Hardy-Weinberg Theorem useful for studying evolutionary change? What are the assumptions of this model? How does it work (in other words, describe the procedure which is used and how you figure out genotype frequencies)?
Thursday, October 8, 2015 by Sarah

Biology
What 2 bio molecules are the cell membrane primarily made of?
Wednesday, October 7, 2015 by Janey

Biology
What is the difference between an environment with freshwater and an environment with pristine wates? I need to design an experiment with a shrimp that is found in freshwater but not in pristine but I don't understand what is the difference between the two. Thanks!
Wednesday, October 7, 2015 by Anonymous

Gr.11 Biology
In guinea pigs, black cot is dominant to albino. Rough coat us dominant to smooth coat. A black smooth guinea pig was mated with an albino rough guinea pig. Their offspring were black rough and black smooth. If these were the only produced over a period of years of matings, ...
Tuesday, October 6, 2015 by Helen

biology
You are preparing 500 mL of Denaturation Buffer containing 1.5 M NaCl and 0.5 M NaOH. Your stock solutions are 5 M NaCl and 6 M NaOH. How would you prepare the Denaturation Buffer? Include all of the solutions needed to make the buffer. For Nacl, C1V1=C2V2 5*V1=500*1.5 V1=150 ...
Monday, October 5, 2015 by sara

Biology
a. A human cell is placed in a container of sugar water. Explain what would occur, if the cell membrane is impermeable to sugar. I know that the water in the cell is the high concentration and will go to the sugar water which is the low concentration. b. Another cell is placed...
Monday, October 5, 2015 by Judy

biology
I am doing msc., degree . I want do project on clown fish but i did not select the topic till now. Can you help me to select topic
Monday, October 5, 2015 by madhumitha

Biology
Is the oval window soft or hard? Explain the advantage to your answer Personally I think it's soft and it's because being soft would it to be amplified to the ear hear things more clearly. Explain why a person with a sore throat may end up with a mild ear infection. I ...
Sunday, October 4, 2015 by Alex

Biology
Compare and contrast natural selection and artificial selection. All I can think of is that man controls what happens in artificial selection.
Sunday, October 4, 2015 by Anonymous

Biology
Evolution by artificial selection is a common way by which people breed plants and animals to have characteristics that we find desirable. Imagine that you are working in a lab where scientists are trying to breed a strain of apple that has much higher sugar content. How might...
Sunday, October 4, 2015 by Anonymous

Biology
You place a piece of paper on a balance and find that its mass is 0.63 g. You add a lump of NaOH to the paper and get a mass of 22.21 g. You remember that you forgot to tare the balance before taking this measurement. You tare the balance, add another lump of NaOH, and read 20...
Sunday, October 4, 2015 by Misaki

HELP HELP ap biology
field of view for 1000x total magnification is it .2 micrometers? help!
Saturday, October 3, 2015 by Anonymous

Gr. 11 biology
Your aunt moves out of the town and leaves you her mouse, Henry. In order to make some money, you decide to breed mouse and sell the offspring. In looking over Henry's family history, you discover that Henry's grandfather expressed a rare genetic disorder which leads ...
Saturday, October 3, 2015 by Helen

Gr.11 Biology
In humans, muscular dystrophy is a condition in which the muscles waste away during early life, resulting in death in the early teens. It is due to recessive sec-linked gene. A certain couple have 5 children- 3 boys, ages one, three and ten; and 2 girls, ages five and seven. ...
Saturday, October 3, 2015 by Helen

Biology
a. A human cell is placed in a container of sugar water. Explain what would occur, if the cell membrane is impermeable to sugar. b. Another cell is placed into a container of sugar water. However, this cell has the capability to allow large molecules such as sugar to pass ...
Saturday, October 3, 2015 by Eliza

Biology
What is true of the energy that is passed from one trophic level to the next in a food chain? A)About 10% of the energy passed from one level to the next is released as heat. B)About 10% of the stored energy of one level becomes stored energy at the next higher level. C)The ...
Thursday, October 1, 2015 by SkatingDJ

Biology - Genetics
Can someone please help explain in a step by step process how to do this problem and what it means? I do not understand what it is asking for exactly in regards to positive, negative, and the resistance gene and so forth...especially about the media being selective. What does ...
Thursday, October 1, 2015 by Misa

Biology
Synthesis means the process by which simple compounds are united to form more complex materials. Dehydration means loss of water. Explain why chemists refer to the joining of monosaccharide molecules to form disacchardies as dehydration synthesis reaction
Wednesday, September 30, 2015 by Anonymous

Science
I am writing a mock biotechnology research proposal for class and I don't know what I should make this research plan about. What are some of the most breaking scientific news, or diseases and issues in this field(biology preferred, or chemistry) that are currently having ...
Wednesday, September 30, 2015 by Betty

Biology
You find 3 trees where each tree gives a different coloured fruit: red, pink or orange. You perform crosses between all three trees and get the following results: P: red x pink ---F1: ½ red: ½ pink P: red x orange --- F1: ½ red: ½ orange P: pink x ...
Sunday, September 27, 2015 by James

biology
What does a chameleon do for the environment?
Sunday, September 27, 2015 by anon

biology
Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status c?
Saturday, September 26, 2015 by Time

biology
In evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following provides the most convincing support for this hypothesis? a. there are more types of RNA than there are of DNA b. RNA can both store genetic information and act as an enzyme c. ...
Saturday, September 26, 2015 by Time

Biology
Could someone please help me with this question. 1100KJ in the form of x*y^2 Thank you for your time and help
Friday, September 25, 2015 by Cherie

biology-microscope
1. should the aperture diaphragm be adjusted to its most open or its least open setting, to begin? 2.where should the stage be set when you first observe the specimen, using the low power objective lens?
Friday, September 25, 2015 by Anonymous

biology
what is the difference between an exergonic reaction and an endergonic reaction?
Thursday, September 24, 2015 by daniel

biology
Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status c? confused cuz transcription is the first step in ...
Thursday, September 24, 2015 by help please

biology
In evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following provides the most convincing support for this hypothesis? a. there are more types of RNA than there are of DNA b. RNA can both store genetic information and act as an enzyme c. ...
Thursday, September 24, 2015 by Tim

Biology
Which of these classifications is most specific? Family Genus Phylum Order I really need help on this question, and if u can do it THANK YOU SO MUCH! Its for my Biology test.
Thursday, September 24, 2015 by Michael

Biology
2. Which macromolecules were present in your saliva
Thursday, September 24, 2015 by Shia

biology
In evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following provides the most convincing support for this hypothesis? a. there are more types of RNA than there are of DNA b. RNA can both store genetic information and act as an enzyme c. ...
Thursday, September 24, 2015 by Tim

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Homework Help: Science