AP Biology Quiz
20 questions · no time limit
0:00
GENE EXPRESSION AND REGULATION
Question 1 of 20
No time limit
Current
Answered
Flagged
Not seen
A researcher heats double-stranded DNA, causing the strands to separate, and then cools the sample so strands re-form a double helix. Re-annealing occurs when nucleotides on one strand form hydrogen bonds with complementary nucleotides on the other strand while the sugar-phosphate backbones remain intact. The stability of the re-formed double helix depends on the pattern of base pairing along the strands. Which feature best explains how separated DNA strands can accurately re-anneal after cooling?
YOUR PROGRESS
20
QUESTIONS
Ready when you are
Answer in any order. Your progress shows here as you go.
QUESTIONS
KEYBOARD
Pick an answer ABCDE
Next question ↵→
Previous ←
Flag for review F
Answers save as you go · flagged questions come back at the end