The Promoters of Positively Controlled Operons Require Activator Proteins, Because

question 54

Multiple Choice

The promoters of positively controlled operons require activator proteins, because

• A) the promoters have nucleotide sequences that bind RNA polymerase weakly, which are not close matches to the consensus sequence.
• B) they are needed to bind to the allosteric site of RNA polymerase.
• C) RNA polymerase easily recognizes the consensus sequence.
• D) they are required to inactivate the repressor proteins.

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Definitions:

Voltage-gated

Pertaining to ion channels in the plasma membrane that open or close in response to changes in membrane potential.

Aerobic Respiration

The process of producing cellular energy involving oxygen. It's used by cells to convert glucose into energy.

Cardiac Muscle Cells

Specialized, striated muscle cells found in the heart, responsible for pumping blood throughout the body through involuntary contractions.

Mitochondria

Organelles found in the cytoplasm of eukaryotic cells that are involved in energy production through the process of oxidative phosphorylation.