Nucleic Acid 1
Nucleic Acid 2
y
Figure 1. Nucleic acid segments
DNA and RNA are nucleic acids that can store biological information based on the sequence of their nucleotide monomers. Figure 1 shows a short segment of each of the two types of nucleic acids.
Which of the following best describes a structural difference between DNA and RNA?
(A) DNA contains four types of nitrogenous bases, whereas RNA contains only two types of nitrogenous bases.
(B) The backbone of DNA contains deoxyribose, whereas the backbone of RNA contains ribose.
(C) A DNA molecule is composed of two parallel strands with the same 5^(') to 3^(') directionality, whereas an
RNA molecule is composed of only one 5^(') to 3^(') strand.
(D) Phosphate groups provide rigidity to DNA, but RNA is flexible and contains no phosphate groups.
Nucleic Acid1
Nucleic Acid 2
Figure 1.Nucleic acid segments
DNA and RNA are nucleic acids that can store biological information based on the sequence of their nucleotide monomers. Figure l shows a short segment of each of the two types of nucleic acids.
Which of the following best describes a structural difference between DNA and RNA? DNA contains four types of nitrogenous bases, whereas RNA contains only two types of nitrogenous (A) bases.
A DNA molecule is composed of two parallel strands with the same 5' to 3' directionality, whereas an (C) RNA molecule is composed of only one 5'to 3strand.