AP Biology 6.1.B DNA Structure and Heredity
Practise AP Biology 6.1.B questions by interpreting base pairing, hydrogen bonding, GC content and experimental evidence for DNA heredity.
- Syllabus
- Effective Fall 2025
- Course
- AP Biology
Exam points
- interpret base-pairing rules and purine-pyrimidine composition in DNA or RNA
- connect hydrogen bonding and GC content to DNA denaturation temperature
- use molecular-labeling evidence to identify DNA as hereditary material
6.1.B—Describe the characteristics of DNA that allow it to be used as hereditary material question 1
[Maximum number: 1]
A researcher measured the temperature at which two different samples of double-stranded DNA denature (separate into single strands). Sample 1 denatured at a significantly lower temperature than sample 2 did. Based on the data, the researcher claims that the DNA in sample 2 is composed of a higher percentage of guanine and cytosine than the DNA in sample 1 is. Which of the following best supports the researcher's claim?
A
The bonds between guanine and cytosine are covalent bonds, which require more energy to disrupt than those between adenine and thymine.
B
Guanine-cytosine pairs denature at a higher temperature because they have more hydrogen bonds between them than adenine-thymine pairs do.
C
Adenine-thymine pairs require less energy to separate because adenine and thymine are both single-ring bases.
D
Guanine-cytosine pairs require more energy to separate because one is a purine and one is a pyrimidine. The corals' adaptation is an example of adaptive radiation because it has resulted in a wide range of species adapting to the new ocean conditions.
B
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