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DNA Question (T/F)


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#1 strwberry

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Posted 19 October 2009 - 08:21 AM

1. The problem statement, all variables and given/known data

Which of the following are true statements ?

a) DNA is composed of a series of necleotides, each of which is made up of a phosphoric acid unit, a sugar unit and a cyclic nitrogen base.

:P In DNA the base must be either alanine, threonine, glutamine, or cysteine.

c) In the three-dimensional Watson-Crick structure of DNA, two polynucleotide DNA strands wind around each other to form a double helix.

d) The DNA sequence of base pairs in the nucleus of a cell represents the genetic code that controls inherited characteristics.

e) Genes are the sequence of bases in DNA that are the code for the synthesis of a single protein within the body.

2. The attempt at a solution

NOT SURE BUT :
a) [FALSE]It can not be a because it should be phosphate group instead of cyclic nitrogen base
B) [TRUE?] I thought it should be correct, since DNA bases are adenine (A), guanine (G), thymine (T), and cytosine ©
c) [TRUE] It's true that the two polynucleotide chains in DNA molecule.
d) [TRUE] the bases are unique, that tells the characteristics
e) [FALSE?] I'm not sure, but I thought that it should be since genes are code for synthesis of proteins.

I tried bcde and bcd but it's incorrect. :D Please help, thank you!

#2 mdfenko

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Posted 19 October 2009 - 08:31 AM

a) is true, b) is false (those are amino acids), e) is false because some genes code for more than one protein.

Edited by mdfenko, 19 October 2009 - 08:32 AM.

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#3 almost a doctor

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Posted 19 October 2009 - 08:37 AM

1. The problem statement, all variables and given/known data

Which of the following are true statements ?

a) DNA is composed of a series of necleotides, each of which is made up of a phosphoric acid unit, a sugar unit and a cyclic nitrogen base.

B) In DNA the base must be either alanine, threonine, glutamine, or cysteine.

c) In the three-dimensional Watson-Crick structure of DNA, two polynucleotide DNA strands wind around each other to form a double helix.

d) The DNA sequence of base pairs in the nucleus of a cell represents the genetic code that controls inherited characteristics.

e) Genes are the sequence of bases in DNA that are the code for the synthesis of a single protein within the body.

2. The attempt at a solution

NOT SURE BUT :
a) [FALSE]It can not be a because it should be phosphate group instead of cyclic nitrogen base
B) [TRUE?] I thought it should be correct, since DNA bases are adenine (A), guanine (G), thymine (T), and cytosine
c) [TRUE] It's true that the two polynucleotide chains in DNA molecule.
d) [TRUE] the bases are unique, that tells the characteristics
e) [FALSE?] I'm not sure, but I thought that it should be since genes are code for synthesis of proteins.

I tried bcde and bcd but it's incorrect. :( Please help, thank you!


I think a is true and b is false.

a: DNA is composed of dNTPs which are composed by a sugar (deoxyribose), a base (the cyclic nitrogen base: A, T, C or G) and a phosphate group (the phosphoric acid).

b: alanine, threonine, glutamine and cysteine are all aminoacids not bases. The DNA bases as you said are: Adenine, Thymine, Cytosine and Guanosine, so not sure why you thought b might be true.

c: true
d: true... although it could also be false (if being petty) as it does not include mitocondrial DNA which also codes for inherited characterisitcs
e: false. 1 gene is not always 1 protein as there can be splicing variants and things like that.

So my bet is that A and C are definitely true, B and E are definitely false... and I have my doubts about D.

Hope this helps :)

Edited by almost a doctor, 19 October 2009 - 08:37 AM.


#4 strwberry

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Posted 19 October 2009 - 08:50 AM

I tried c, ac, acd, cd :( they all are wrong =(
Thanks for helping though.

Edited by strwberry, 19 October 2009 - 08:54 AM.


#5 HomeBrew

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Posted 19 October 2009 - 01:19 PM

Should have tried acde...:lol:




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