In genetic code, how many codons code for the amino acid tryptophan?
A. 6
B. 1
C. 2
D. 4
Answer: Option B
Solution (By JKSSB Mock Tests)
Tryptophan is encoded by a single codon, UGG. Methionine (AUG) is also encoded by a single codon. The other amino acids have multiple codons (degeneracy). For example, leucine has 6 codons. The single codons for Trp and Met are significant as they are less likely to tolerate mutations.
Explanation:
Relaxin is a peptide hormone produced by the corpus luteum and the placenta during pregnancy. Its primary roles are to relax the smooth muscles of the uterus (inhibiting contractions to maintain pregnancy) and to soften and increase the flexibility of the connective tissues in the pelvis, specifically the pelvic ligaments and the pubic symphysis. This relaxation and widening of the pelvic joints facilitate the passage of the baby through the birth canal during delivery.
Explanation:
Renin is secreted by juxtaglomerular cells of the kidney in response to low blood pressure or sodium. It converts angiotensinogen to angiotensin I, initiating the RAAS. Liver produces angiotensinogen, adrenal aldosterone, heart ANP.
Explanation:
Gibberellins stimulate seed germination by activating synthesis of hydrolytic enzymes (amylase) that break down stored food reserves. They also promote stem elongation. Abscisic acid inhibits germination and promotes dormancy. Ethylene is for ripening, cytokinins for cell division. The GA:ABA ratio determines germination vs dormancy.
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