Question

29. A hydrophilic peptide that signals the cell to transcribe genes involved in the breakdown of fat utilizes a/an _______ receptor and produces a ______ response

1. Cell-surface, slow

2. Intracellular, slow

3. Intracellular, fast

4. Cell surface, fast

Answer 1

The peptide being hydrophilic in nature cannot cross through the hydrophobic lipid bilayer and hence it has to communicate through the cell surface receptors only. Because it communicates it's signals through the cell surface receptors, there will be a downstream signalling cascade which will be in place and hence it will be relatively slow when compared to signalling that comes from intracellular response. Hence the correct answer is:

1. Cell surface, slow

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