Question 1
Which statement is true of DNA’s structure?
(a) The hydrogen bonding of cytosine to guanine is an example of complementary base pairing.
(b) In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine.
(c) Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base.
(d) When adenine base pairs with thymine, they are linked by three hydrogen bonds.
(e) All four bases in DNA can be found in equal quantities.
Question 2
Which Of The Following Statements About The Structure And Packaging Of Chromosomal DNA Is True?
Question 3
Which of the following are TRUE statements about DNA vs RNA?
a) Both DNA and RNA use the same sugar in their nucleotides
b) DNA and RNA use the same pyrimidine nucleotides as monomers
c) Both DNA and RNA generally exist in a double helix structure
d) RNA, but not DNA, leaves the nucleus
Answer to question 1
The correct statement is a because DNA complementary base pairing occurs when C binds to G and A binds to T. Statement b is incorrect because adenine base pairs with thymine, not guanine, and cytosine base pairs with guanine, not thymine. Statement c is incorrect because A and G have purine nitrogen-containing bases whereas C and T have pyrimidine nitrogen-containing bases. Statement d is incorrect because A and T are linked by two hydrogen bonds, instead of three. Statement e is incorrect because the four bases are not found in different quantities, however, the complementary base pairs are found in equal quantities because anytime A is present, T is also present and anytime G is present, C is also present.
Answer to question 2
Answer to question 3
Which of the following are TRUE statements about DNA vs RNA?
Answer : d) RNA, but not DNA, leaves the nucleus