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?
14. DNA Synthesis
Discovering the Structure of DNA
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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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