In recombinant DNA technology, restriction enzymes are used to: MCQ with Answer and Explanation

Explanation:
After ovulation, the ruptured Graafian follicle transforms into a temporary endocrine structure called the corpus luteum. Its primary function is to secrete large amounts of progesterone (and some estrogen). Progesterone is crucial for maintaining the thickened, highly vascularized uterine endometrium (secretory phase), making it receptive for the implantation of a blastocyst. If fertilization does not occur, the corpus luteum degenerates, progesterone levels drop, and menstruation begins.

Explanation:
During pregnancy, high progesterone and estrogen from the corpus luteum and placenta suppress gonadotropin secretion, preventing follicular development and menstruation. R correctly explains A.

Explanation:
Urobilin is derived from bilirubin, a heme breakdown product, and gives urine its yellow color. R is true and explains A.