4
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 and choose the correct answerIn light of the above statements, choose the most appropriate answer from the options given below
EXPLANATION
Genetic Code Characteristics, Wobble Hypothes
- 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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