How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Andrea Your Own Question

Andrea, Graduate Student
Category: Homework
Satisfied Customers: 187
Experience:  Doctoral Candidate and Adjunct Prof. of Biology
Type Your Homework Question Here...
Andrea is online now
A new question is answered every 9 seconds

1) Compare and contrast DNA and RNA. How many strands does

This answer was rated:

1)     Compare and contrast DNA and RNA. How many strands does each have? What are their bases? What are their sugars? What are their functions?
2)   If this is one strand of DNA: ATTGCGTCAATTACGCTA, what would its complementary strand be?
3)   If this is a strand of DNA: ATTGCGTCAATTACGCTA, what would the mRNA strand look like after transcription? What would the amino acid sequence be of the mRNA?
4) What are the functions of mRNA, tRNA, and rRNA?
5) Compare and contrast mitosis and meiosis. What is the purpose of each? In what types of cells are each occurring? What are the differences in the divisions of each? What is the final outcome of each (number of cells and genetic make-up)?
6) Name the 4 phases of the cell cycle and describe what is happening in each.
7) Define the following: sporophyte, gametophyte, allele, zygote, egg
8) In humans, brown eyes (B) are dominant over blue (b). A brown-eyed man marries a blue-eyed woman and they have children. What are the phenotypes



Here are your answers, I hope they help!






1) DNA, or deoxyribonucleic acid, is a double-stranded helix that contains the genetic code for all animals and plants. DNA is made of DNA includes the information for genes which are eventually translated into protein, and sequences before and after genes that allow genes to be transcribed. DNA also contains "junk" information that is not yet understood by scientists. DNA is made up of an alternating deoxyribose sugar and phosphate backbone. Between the two backbones are four types of bases: guanine, adenine, cytosine, and thymine, which basically join the backbones by hydrogen bonds. RNA, or ribonucleic acid, is single-stranded and is transcribed (or copied) from a strand of DNA. RNA includes the sequence of genes that are to be translated into proteins and is referred to as messenger RNA (mRNA). RNA does not form a helix, but it can form other secondary structures, such as hairpins. RNA's backbone consists of ribose sugars alternating with phosphate and has bases similar to DNA, but thymine is replaced with uricil.




3) Assuming the DNA strand is the transcribed strand, the mRNA would be:

UAA CGC AGU UAA UGC GAU and the amino acid sequence would be Stop, Arg, Ser, Stop, Cys, Asp


4) mRNA-messenger RNA is transcribed from DNA and tells the ribosome which amino acids to use when building a protein (called translation). Every three bases corresponds to an amino acid.

tRNA-transfer RNA is a smaller chain of nucleotides that transfers the correct amino acid to the polypeptide chain that is being made by a ribosome during translation.

rRNA-ribosomal RNA is the catalytic component of the ribosome and is made in the nucleus (as opposed to the cytosol).


5) Mitosis is the process of a diploid cell duplicating itself, resulting in two cells with identical genetic information and the proper organelles. Meiosis is part of sexual reproduction and the process of a diploid cell duplicating itself and dividing into a total of four haploid cells. Mitosis occurs in all cells, except for germ cells and meiosis occurs only in germ cells (to produce sperm or eggs). Below is a table that shows the differences in the phases:

Mitosis Meiosis

Prophase-chromatin condenses Prophase I-same, but recombination occurs

and forms chromosomes

Metaphase-chromosomes align Metaphase I-same

in center of cell

Anaphase-sister chromotids are Anaphase I-same but whole chromosomes are pulled to

Pulled apart to the centrioles one side, so each side has half of the total of chrom.

Telophase-nuclear envelope forms Telophase I -same

and chromosomes decondense ProphaseII-TelophaseII-similar to Mitosis, but DNA is

not duplicated


6) G1-part of interphase, where cells increase in size and cellular functions (such as protein synthesis) occur at a high rate

S phase-part of interphase, where DNA replication occurs to prepare for mitosis

G2-part of interphase, where the cells continue to grow and make sure that everything is prepared and in proper order before mitosis begins

M phase-part of cell division, where cell growth stops and the cell enters mitosis


7) Sporophyte-a diploid non-sexual reproductive phase in a plant's life cycle where it can produce spores

Gametophyte-the haploid phase of a plant's life cycle, w here the plant produces gametes for sexual reproduction

Allele-one copy of a gene. Humans have two copies of every gene, or two alleles, one from each parent

Zygote-the diploid fertilized cell produced from the joining of a haploid sperm with a haploid egg

Egg-the female animal's gamete or sex cell, which is haploid


8) The husband's genotype is either Bb or BB and the mother's genotype is bb. Therefore, the offspring's phenotypes could include brown or blue eyes, depending on the father's genotype. If the father is heterozygous, then most of the offspring would have brown eyes, but it is possible for some of them to have blue eyes. If the father is homozygous, then all of the children will have brown eyes.

Customer: replied 7 years ago.
There was a question missing. number 9.), but number (1) I didnt really like the way you answer that question and its not the same answer as my own written, bur once this question is answered i will pay asap meaning today

9) In some cats the gene for tail length shows incomplete dominance. Cats with long tails are homozygous dominant and cats with no tails are homozygous recessive. Heterozygous cats have short tails. For each of the following construct a punnett square and give phenotypic and genotype ratios of the offspring.
a) a long tail cat and a cat with no tail
b) a long tail cat and a short tail cat
c) a short tail cat and a cat with no tail
d) two short tail cats.

You need to spend $3 to view this post. Add Funds to your account and buy credits.
Andrea, Graduate Student
Category: Homework
Satisfied Customers: 187
Experience: Doctoral Candidate and Adjunct Prof. of Biology
Andrea and 5 other Homework Specialists are ready to help you
Customer: replied 7 years ago.
Thank you I accept the work. Great job
Customer: replied 7 years ago.
i might need ur help this week ,


Thanks! I'm glad you liked it!


I would be glad to help you. I probably won't check in too much over this weekend (Sat-Monday) because it is a holiday weekend. If this is a problem, feel free to allow other experts to answer your questions. I will definately be checking for questions Tuesday, and I will try to periodically check in over the weekend.


Thanks again!


JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Previous | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX

Meet The Experts:

  • LogicPro



    Satisfied Customers:

    Expert in Java C++ C C# VB Javascript Design SQL HTML
< Last | Next >
  • LogicPro's Avatar



    Satisfied Customers:

    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany


    Satisfied Customers:

    More than 5000 online tutoring sessions.
  • Linda_us's Avatar


    Finance, Accounts & Homework Tutor

    Satisfied Customers:

    Post Graduate Diploma in Management (MBA)
  • Chris M.'s Avatar

    Chris M.

    M.S.W. Social Work

    Satisfied Customers:

    Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
  • F. Naz's Avatar

    F. Naz

    Chartered Accountant

    Satisfied Customers:

    Experience with chartered accountancy
  • Bizhelp's Avatar



    Satisfied Customers:

    Bachelors Degree and CPA with Accounting work experience
  • Seanna's Avatar



    Satisfied Customers:

    3,000+ satisfied customers, all topics, A+ work

Related Homework Questions