NEET Zoology Hormone Action Mechanism MCQ Question
Which combination of statements correctly describes the mechanisms of hormone action?
Peptide hormones generate second messengers after binding to membrane receptors. 2. Steroid hormones typically enter target cells and regulate gene expression directly.
Steroid hormones act only through second messengers. 2. Peptide hormones can pass through the cell membrane freely.
Hormones always require a receptor to exert their effects. 2. Only steroid hormones can affect gene expression.
All hormones act directly on DNA. 2. Peptide hormones can only affect metabolic pathways without receptors.
Correct Answer
Detailed Explanation
Statement A correctly identifies that peptide hormones utilize second messengers after binding to membrane receptors, while steroid hormones can penetrate the cell membrane and influence gene expression directly. Statement B incorrectly suggests that steroid hormones act only through second messengers, and Statement C wrongly implies that only steroid hormones affect gene expression. Statement D is incorrect as not all hormones act directly on DNA.
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