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Which set correctly lists the four nitrogenous bases found in DNA?
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7. DNA and Chromosome Structure
DNA Structure
Scelta multipla
In double-stranded DNA, what is the correct base-pairing rule (Watson–Crick base pairing)?
A
A pairs with U, and G pairs with C.
B
A pairs with T, and G pairs with C.
C
A pairs with G, and C pairs with T.
D
A pairs with C, and G pairs with T.
Guida verificata passo dopo passo1
Recall that DNA is composed of four nitrogenous bases: adenine (A), thymine (T), guanine (G), and cytosine (C).
Understand that Watson–Crick base pairing describes how these bases pair specifically in double-stranded DNA to maintain a consistent structure.
Remember the key rule: adenine (A) pairs with thymine (T) through two hydrogen bonds, and guanine (G) pairs with cytosine (C) through three hydrogen bonds.
Note that uracil (U) is found in RNA, not DNA, so A does not pair with U in DNA.
Therefore, the correct base-pairing rule in double-stranded DNA is: \(A \leftrightarrow T\) and \(G \leftrightarrow C\).
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