THE CELL
CELL COMMUNICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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on the cell surface; within the cell
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within the cell; on the cell surface
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on the cell surface; within the membrane interior
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on the nuclear membrane; on the cell surface
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on the cell surface; on the nuclear membrane
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Detailed explanation-1: -Polar receptor ligands are found on the outside of the plasma membrane because they cannot cross the plasma membrane.
Detailed explanation-2: -They are found in the cytoplasm of a cell and are often targeted by hydrophobic ligands that can cross the lipid bilayer of the animal plasma cell membrane. Often these receptors act to modify mRNA synthesis and thus protein synthesis within the cell.
Detailed explanation-3: -Internal receptors are found in the cell cytoplasm. Here, they bind ligand molecules that cross the plasma membrane; these receptor-ligand complexes move to the nucleus and interact directly with cellular DNA. Cell-surface receptors transmit a signal from outside the cell to the cytoplasm.
Detailed explanation-4: -Not all receptors exist on the exterior of the cell. Some exist deep inside the cell, or even in the nucleus. These receptors typically bind to molecules that can pass through the plasma membrane, such as gases like nitrous oxide and steroid hormones like estrogen.