Q.54
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
A: Hormones binds to receptors present on cell surface or inside the cells R: All hormones are protein in nature Read the statements andchoose the correct answer
In light of the above statements, choose the most appropriate answer from the options given below
- Evaluation of Statements:
- Assertion (A): Hormones bind to receptors present on the cell surface or inside the cells.
- True. Hydrophilic hormones (peptides, catecholamines) bind to transmembrane cell-surface receptors (GPCRs, RTKs), while lipophilic hormones (steroids, thyroid hormones) cross the plasma membrane to bind intracellular cytoplasmic or nuclear receptors.
- Reason (R): All hormones are protein in nature.
- False. Hormones exhibit diverse chemical structures:
- Steroid hormones (estrogens, progesterone, testosterone, cortisol, aldosterone) are lipids derived from cholesterol.
- Amine hormones (epinephrine, norepinephrine, thyroxine, melatonin) are derived from single amino acids (tyrosine, tryptophan).
- Eicosanoids (prostaglandins) are derived from fatty acids.
- Therefore, claiming all hormones are protein in nature is false.
- nalysis:
- ((A) is correct but (R) is not correct): Correct.
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
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