External stimuli would be received most quickly by a plant cell if the receptors for signal transduction were located in the
A) plasma membrane.
B) cytoplasmic matrix.
C) endoplasmic reticulum.
D) nuclear membrane.
E) nucleoplasm.

Question

Quizplus · Accepted Answer

External stimuli, such as light or touch, would be received by the plasma membrane of a plant cell. This is because the plasma membrane is the outermost layer of the cell and is in direct contact with the environment. Receptors for signal transduction, such as photoreceptors or mechanoreceptors, are located on the plasma membrane and initiate a signal cascade inside the cell upon receiving a stimulus. Thus, the plasma membrane is the most ideal location for receptors to quickly receive external stimuli.

External Stimuli Would Be Received Most Quickly by a Plant