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

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.

Quizplus · Accepted Answer

Complementary base pairing is the hydrogen bonding between specific nitrogenous base pairs in DNA. The pairing of cytosine and guanine is an example of complementary base pairing.

Answer: B is incorrect because adenine base pairs with thymine and guanine base pairs with cytosine.

Answer: C is incorrect because each nucleotide has one of four different nitrogen-containing bases, either adenine, thymine, guanine or cytosine.

Answer: D is incorrect because adenine and thymine are linked by two hydrogen bonds, and guanine and cytosine are linked by three hydrogen bonds.

Answer: E is incorrect because the four bases are not always found in equal quantities in DNA.

Which Statement Is True of DNA's Structure