Which of the following is (are) not characteristics of the pathways activated by second messengers?
Some phosphatases and protein kinases in the pathway have numerous proteins as their substrates; others act on only a single protein substrate or a single amino acid of a protein substrate. |
Alterations in the conformations of signaling proteins are often accomplished by protein kinases and protein phosphatases that, respectively, add or remove phosphate groups from other proteins. |
Each protein in the pathway typically acts by altering the conformation of the previous (upstream) protein in the series, an event that activates or inhibits the protein. |
Each signaling pathway consists of a series of distinct proteins that operate in sequence. |
Correct answer:- (C) Each protein in the pathway typically acts by altering the conformation of the previous (upstream) protein in the series, an event that activates or inhibits the protein.
Explanation- Second messengers are molecules that relay signals from receptors on the cell surface to target molecules inside the cell.
E.g - cAMP, cGMP etc.
- In second messenger some phosphatases and protein kinases in the pathway have numerous proteins as their substrates; others act on only a single protein substrate or a single amino acid of a protein substrate.
- Alterations in the conformations of signaling proteins are often accomplished by protein kinases and protein phosphatases that, respectively, add or remove phosphate groups from other proteins.
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