AP Biology 6.5.B Operon and Regulatory Sequences
Practise AP Biology 6.5.B questions by linking regulatory-sequence location with operon activation, repression and coordinated gene expression.
- Syllabus
- Effective Fall 2025
- Course
- AP Biology
Exam points
- explain how operon operators, repressors and activators regulate prokaryotic transcription
- predict coordinated gene expression from nutrient availability and regulatory-sequence location
- distinguish inducible and repressible operon responses to cellular conditions
6.5.B—Explain how the location of regulatory sequences relates to their function question 1
Which of the following best explains how the prokaryotic expression of a metabolic protein can be regulated when the protein is already present at a high concentration?
Figure 1. Activity levels of two digestive enzymes over a range of pH
A
Repressor proteins can be activated and bind to regulatory sequences to block transcription.
B
Transcription factors can bind to regulatory sequences to increase RNA polymerase binding.
C
Regulatory proteins can be inactivated to increase gene expression.
D
Histone modification can prevent transcription of the gene.
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