Which one of the following hormones is a modified amino acid?
Correct answer: A. Epinephrine
- A. Epinephrine
- B. Progesterone
- C. Prostaglandin
- D. Estrogen
Explanation
Epinephrine is synthesized from tyrosine which is a non-essential amino acid possessing a cyclic structure with a straight side chain bearing carboxylic and amino group. The conversion of tyrosine to epinephrine involves 4 steps - (i) ring hydroxylation (ii) decarboxylation, (iii) sidechain hydroxylation (iv) N-methylation.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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