Multiple Choice
In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and which of the following atoms or molecules of the last nucleotide in the DNA strand?
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14. DNA Synthesis
Discovering the Structure of DNA
Multiple Choice
In DNA, the two purines are __________, and the two pyrimidines are __________.
A
cytosine and guanine; adenine and thymine
B
cytosine and thymine; adenine and guanine
C
adenine and thymine; cytosine and guanine
D
adenine and cytosine; guanine and thymine
E
adenine and guanine; cytosine and thymine
Verified step by step guidance1
Understand the structure of DNA: DNA is composed of nucleotides, each containing a sugar, a phosphate group, and a nitrogenous base.
Identify the two categories of nitrogenous bases: Purines and Pyrimidines. Purines have a double-ring structure, while Pyrimidines have a single-ring structure.
Recall the purines in DNA: The two purines are adenine (A) and guanine (G). These bases have a larger, double-ring structure.
Recall the pyrimidines in DNA: The two pyrimidines are cytosine (C) and thymine (T). These bases have a smaller, single-ring structure.
Match the categories to the options provided: The correct answer is adenine and guanine for purines, and cytosine and thymine for pyrimidines.
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