Scelta multipla
Which type of nucleic acid is known to function as a nonprotein enzyme, catalyzing specific biochemical reactions?
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1. Introduction to Biochemistry
Nucleic Acids
Scelta multipla
Which nitrogenous base, if present in a nucleic acid, would indicate that the molecule is RNA and not DNA?
A
Adenine
B
Thymine
C
Uracil
D
Guanine
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Understand the difference between DNA and RNA: DNA contains the nitrogenous bases adenine (A), thymine (T), cytosine (C), and guanine (G), while RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G). RNA replaces thymine with uracil.
Identify the nitrogenous bases listed in the problem: Adenine, Thymine, Uracil, and Guanine.
Recall that the presence of uracil is a distinguishing feature of RNA, as DNA does not contain uracil.
Compare the options provided in the problem to determine which base is unique to RNA. Uracil is the correct answer because it is found in RNA but not in DNA.
Conclude that the presence of uracil in a nucleic acid indicates that the molecule is RNA and not DNA.
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