Multiple Choice
In the DNA double helix, which components form the sugar-phosphate backbone of each strand?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA, cytosine (C) always pairs with which nitrogenous base?
A
Guanine (G)
B
Uracil (U)
C
Adenine (A)
D
Thymine (T)
Verified step by step guidance1
Recall the base pairing rules in DNA, which state that specific nitrogenous bases pair together through hydrogen bonds.
Identify that DNA contains four nitrogenous bases: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Remember that Adenine (A) pairs with Thymine (T) in DNA, forming two hydrogen bonds.
Recognize that Cytosine (C) pairs with Guanine (G) in DNA, forming three hydrogen bonds.
Conclude that Cytosine (C) always pairs with Guanine (G) in DNA.
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