Multiple Choice
A DNA nucleotide may be made up of a phosphate group along with which of the following components?
3
views
7. DNA and Chromosome Structure
DNA Structure
Struggling with Genetics?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The difference between purines and pyrimidines is that ______.
A
purines are found only in RNA, while pyrimidines are found only in DNA
B
purines have a double-ring structure, while pyrimidines have a single-ring structure
C
purines pair with each other, while pyrimidines pair with each other
D
purines contain only carbon and hydrogen, while pyrimidines contain nitrogen
Verified step by step guidance1
Understand the basic structure of nitrogenous bases in nucleic acids: DNA and RNA contain two types of nitrogenous bases called purines and pyrimidines.
Recall that purines are characterized by having a double-ring structure composed of a six-membered and a five-membered nitrogen-containing ring fused together.
Recognize that pyrimidines have a single six-membered nitrogen-containing ring, which distinguishes them structurally from purines.
Note that purines include adenine (A) and guanine (G), while pyrimidines include cytosine (C), thymine (T, in DNA), and uracil (U, in RNA).
Understand that the pairing rules in DNA involve purines pairing with pyrimidines (A with T, G with C), not purines pairing with purines or pyrimidines pairing with pyrimidines.
Related Videos
Related Practice
