THE CELL
CELL COMMUNICATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
testosterone cannot cross the plasma membrane
|
|
|
not all cells have cytoplasmic receptors for testosterone
|
|
|
not all cells in the body have membrane receptors for testosterone
|
|
|
it is a local regulator
|
|
|
it affects only cells that have ion-channel receptors
|
Detailed explanation-1: -Only target cells have the cell surface receptor able to bind with testosterone. Only target cells contain the genes regulated by testosterone. Only target cells possess the phosphorylation cascade uniquely activated by testosterone. Only target cells possess the intracellular receptor able to bind with testosterone.
Detailed explanation-2: -Answer and Explanation: B) Testosterone. Testosterone is a steroid hormone, meaning that it is hydrophobic and can freely diffuse through the cell membrane of a target cell, thereby binding to a receptor found inside of the target cell.
Detailed explanation-3: -In general, testosterone and other androgens promote protein synthesis and growth of those tissues with androgen receptors. More specifically, the effects of testosterone cause an increase in muscle mass and strength, an increase in bone density and strength and stimulation of linear growth.
Detailed explanation-4: -Testosterone acts on cells through intracellular transcription-regulating androgen receptors (ARs).