Practise AP Biology 6.5.B questions by linking regulatory-sequence location with operon activation, repression and coordinated gene expression.
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
Repressor proteins can be activated and bind to regulatory sequences to block transcription.
Transcription factors can bind to regulatory sequences to increase RNA polymerase binding.
Regulatory proteins can be inactivated to increase gene expression.
Histone modification can prevent transcription of the gene.