13. Steroid hormones such as estrogen act on target cells bya. initiating ion channel activity.b. binding to membrane proteins.c. initiating DNA transcription.d. activating enzymes.e. binding to membrane lipids.
Question
- Steroid hormones such as estrogen act on target cells bya. initiating ion channel activity.b. binding to membrane proteins.c. initiating DNA transcription.d. activating enzymes.e. binding to membrane lipids.
Solution
Steroid hormones such as estrogen act on target cells by initiating DNA transcription. So, the correct answer is c. initiating DNA transcription.
Here's a step-by-step explanation:
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Steroid hormones like estrogen are lipid-soluble and can easily pass through the cell membrane of the target cells.
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Once inside the cell, these hormones bind to specific intracellular receptors in the cytoplasm. This binding forms a hormone-receptor complex.
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This complex then moves into the nucleus of the cell, where it binds to specific DNA sequences.
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The binding initiates the process of transcription, where the DNA's information is copied into messenger RNA (mRNA).
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The mRNA then moves out of the nucleus and into the cytoplasm, where it directs the synthesis of specific proteins.
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These proteins then bring about the changes in the cell associated with the hormone's action.
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