A Repressible Operon Is Usually Controlled By

question 51

Multiple Choice

A repressible operon is usually controlled by:

• A) an inactive repressor that allows it to be in the "on" state
• B) the supply of the precursor product for the enzymes
• C) an inactive repressor that keeps it in the "off" state
• D) tryptophan
• E) being turned "on," usually by the end product of the pathway

---

Definitions:

Hamstring Group

A group of three muscles at the back of the thigh that are involved in bending the knee and extending the hip.

Ischial Tuberosity

The protrusion of the ischium, one of the bones that make up the pelvis, which bears the body's weight when sitting.

Knee Joint

A complex hinge joint in the human body that connects the thigh bone (femur) to the shin bone (tibia), enabling leg movement.

Origins

The points at which muscles are attached to stationary bone structures, serving as the starting point for muscle contraction.