Multiple Choice
Each carbon atom can bond with as many as ________ other atom(s) or molecule(s).
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11. Bonding & Molecular Structure
Chemical Bonds
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Which statement best describes the pairing of purines and pyrimidines in DNA?
A
Pyrimidines can bond with other pyrimidines.
B
Purines can bond with other purines.
C
Purines and pyrimidines do not form specific pairs.
D
Purines only bond with pyrimidines and vice versa.
Verified step by step guidance1
Understand the basic structure of DNA, which consists of two strands forming a double helix.
Recall that the nitrogenous bases in DNA are divided into two categories: purines (adenine and guanine) and pyrimidines (cytosine and thymine).
Recognize that base pairing in DNA follows specific rules known as complementary base pairing, where purines always pair with pyrimidines.
Specifically, adenine (a purine) pairs with thymine (a pyrimidine) via two hydrogen bonds, and guanine (a purine) pairs with cytosine (a pyrimidine) via three hydrogen bonds.
Conclude that this specific pairing maintains a uniform width of the DNA double helix and ensures accurate replication and transcription processes.
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