Multiple Choice
In DNA, base pairing follows A–T and C–G rules. What is the complementary DNA sequence to the strand 5′-TCGATGG-3′ (written 3′→5′)?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, what components form the backbone of the DNA double helix?
A
Alternating nitrogenous bases paired by hydrogen bonds
B
A continuous chain of amino acids connected by peptide bonds
C
Alternating deoxyribose sugars and phosphate groups linked by phosphodiester bonds
D
Ribose sugars linked to phosphate groups and uracil bases
Verified step by step guidance1
Recall the basic structure of DNA, which consists of a double helix formed by two strands running in opposite directions.
Identify the components of each DNA strand: a sugar-phosphate backbone and nitrogenous bases attached to the sugars.
Understand that the backbone is made up of alternating sugar and phosphate groups connected by phosphodiester bonds, providing structural stability.
Recognize that the nitrogenous bases (adenine, thymine, cytosine, guanine) pair with each other via hydrogen bonds, but these bases are not part of the backbone.
Conclude that the DNA backbone is specifically formed by alternating deoxyribose sugars and phosphate groups linked by phosphodiester bonds.
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