Multiple Choice
What is the primary function of messenger RNA (mRNA) in gene expression?
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7. DNA and Chromosome Structure
RNA
Multiple Choice
In both DNA and RNA, which nitrogenous bases are present?
A
Ribose and deoxyribose
B
Thymine and uracil
C
Adenine, guanine, and cytosine
D
Adenine, guanine, thymine, and uracil
Verified step by step guidance1
Step 1: Understand that DNA and RNA are nucleic acids composed of nitrogenous bases attached to sugar molecules (deoxyribose in DNA and ribose in RNA).
Step 2: Recall that the four main nitrogenous bases in DNA are adenine (A), guanine (G), cytosine (C), and thymine (T).
Step 3: Recall that the four main nitrogenous bases in RNA are adenine (A), guanine (G), cytosine (C), and uracil (U), where uracil replaces thymine.
Step 4: Identify the nitrogenous bases common to both DNA and RNA, which are adenine, guanine, and cytosine.
Step 5: Conclude that thymine is unique to DNA, uracil is unique to RNA, and adenine, guanine, and cytosine are present in both DNA and RNA.
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