Multiple Choice
Cytosine (C) makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine (T)?
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14. DNA Synthesis
Chargaff's Rules
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What are the base pairing rules for DNA according to Chargaff's Rules?
A
Adenine pairs with Cytosine, and Guanine pairs with Thymine.
B
Adenine pairs with Thymine, and Guanine pairs with Cytosine.
C
Adenine pairs with Uracil, and Guanine pairs with Cytosine.
D
Adenine pairs with Guanine, and Thymine pairs with Cytosine.
Verified step by step guidance1
Understand that DNA is composed of four nucleotide bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).
Learn Chargaff's Rules, which state that in DNA, the amount of Adenine is equal to Thymine, and the amount of Guanine is equal to Cytosine.
Recognize that these rules imply specific base pairing: Adenine pairs with Thymine, and Guanine pairs with Cytosine.
Visualize the DNA double helix structure where these base pairs form hydrogen bonds, stabilizing the DNA structure.
Remember that Uracil is not found in DNA; it is a base found in RNA, where it pairs with Adenine.
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