Which of the following statements best defines the term ‘spare receptors’? ‘Spare receptors’ refers to receptors that are broken down by cells because they are surplus to requirements. ‘Spare receptors’ occur when the KD for agonist binding to the receptor is smaller than the EC50 determined for a particular physiological response. ‘Spare receptors’ refers to the pool of intracellular receptors that are able to translocate to the plasma membrane. ‘Spare receptors’ can be defined as the number of receptors not occupied by agonist when a maximal response has been achieved, compared to the total number of receptors in the cell.

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.