Multiple Choice
Which sentence best defines nucleosomes?
1
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
In DNA, the two purines are __________, and the two pyrimidines are __________.
A
adenine and cytosine; guanine and thymine
B
cytosine and thymine; adenine and guanine
C
guanine and thymine; adenine and cytosine
D
adenine and guanine; cytosine and thymine
Verified step by step guidance1
Recall that purines and pyrimidines are two categories of nitrogenous bases found in DNA, distinguished by their chemical structure: purines have a two-ring structure, while pyrimidines have a single-ring structure.
Identify the purines in DNA: adenine (A) and guanine (G) are the two purines because they have the larger, two-ring structure.
Identify the pyrimidines in DNA: cytosine (C) and thymine (T) are the two pyrimidines because they have the smaller, single-ring structure.
Match the pairs accordingly: purines are adenine and guanine; pyrimidines are cytosine and thymine.
Use this knowledge to select the correct answer choice that lists adenine and guanine as purines and cytosine and thymine as pyrimidines.
Related Videos
Related Practice
