Which of the following are receptor sites on the outer surface of the plasma membrane?
A)ATP
B)carbohydrates
C) cyclic AMP
D) proteins
For the following questions, assume a hypothetical postsynaptic neuron has three presynaptic inputs: X, Y, and Z. Also assume that presynaptic neurons Y and Z are excitatory.

Question

Quizplus · Accepted Answer

Proteins can serve as receptor sites on the outer surface of the plasma membrane for receiving signals from other cells or extracellular signaling molecules.

Answer: XY
 The hypothetical neuron receives inputs from three presynaptic neurons, X, Y, and Z. We know that presynaptic neurons Y and Z are excitatory, which means they increase the likelihood of the postsynaptic neuron firing an action potential. Therefore, the best choice would be the combination of X and Y, as they would provide both excitatory and inhibitory inputs to the postsynaptic neuron, allowing for more precise control of its firing.

Which of the Following Are Receptor Sites on the Outer