AP Biologymediummcq1 pt
One strand of a DNA double helix reads 5'-GATTACAG-3'. Written in the 5' to 3' direction, what is its partner strand?
A.5'-CTGTAATC-3'
B.5'-CTAATGTC-3'
C.5'-GATTACAG-3'
D.5'-CTGTAATG-3'
Explanation
Core Concept
Pairing rules put T opposite A and G opposite C, and the two strands run antiparallel. Complementing the given strand base by base produces a 3' to 5' sequence, so the answer must then be reversed to report it 5' to 3', giving CTGTAATC. Copying the original order without flipping, duplicating the starting strand, or slipping one base all describe the classic errors.
Correct Answer
A5'-CTGTAATC-3'
More Unit 1: Chemistry of Life practice questions
- easyAn enzyme's function is destroyed by extreme pH. The most direct explanation is that
- easyWhat is the monomer of proteins?
- mediumBoth starch and glycogen are glucose polymers used for storage. Their structural difference is that
- easyIf a solution of a biomolecule turns a pH indicator acidic, which group is most likely present?
- easySulfur is most notably found in which biomolecules?
Practice more AP Biology questions with full explanations
Practice Unit 1: Chemistry of Life Questions →