Multiple Choice
Which of the following descriptions best fits the class of molecules known as nucleotides?
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4. Biomolecules
Nucleic Acids
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Which of the following is true regarding complementary base pairing in DNA and RNA molecules?
A
Although a DNA molecule demonstrates complementary base pairing between two DNA polynucleotides to form a double helix, an RNA molecule can base-pair only along stretches of nucleotides in the same RNA molecule, such as in transfer RNA molecules.
B
Complementary base pairing promotes an antiparallel orientation in the structure of DNA and RNA molecules.
C
Complementary base pairing within single strands of DNA and RNA gives them particular three-dimensional structures that are necessary for their function.
D
None of the listed responses is correct.
E
Although the base pairing between two strands of DNA in a DNA molecule can be thousands to millions of base pairs long, base pairing in an RNA molecule is limited to short stretches of nucleotides in the same molecule or between two RNA molecules.
Verified step by step guidance1
Understand the concept of complementary base pairing: In DNA, complementary base pairing involves adenine (A) pairing with thymine (T) and cytosine (C) pairing with guanine (G). In RNA, adenine pairs with uracil (U) instead of thymine.
Recognize the structural differences between DNA and RNA: DNA is typically a double-stranded helix, while RNA is usually single-stranded but can form secondary structures through base pairing within the same molecule.
Identify the role of complementary base pairing in DNA: It stabilizes the double helix structure and allows for accurate replication and transcription processes.
Examine the role of complementary base pairing in RNA: It contributes to the formation of secondary structures like hairpins and loops, which are crucial for the function of molecules like transfer RNA (tRNA) and ribosomal RNA (rRNA).
Evaluate the statement regarding base pairing in RNA: Base pairing in RNA is often limited to short stretches within the same molecule or between two RNA molecules, unlike the extensive base pairing seen in DNA.
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