paramamark1151 paramamark1151

21-01-2024
Biology

Answered

Differentiation among blastomeres is the result of
A) enzymes introduced by the sperm.
B) hormones produced by the ovum.
C) an unequal distribution of regulatory molecules in the cytoplasm of the ovum.
D) regulator molecules supplied by cells of the uterus.
E) enzymes activated by the sperm.

Answer :

Other Questions

During amphimixis, A) sperm become haploid. B) the ovum finishes meiosis II. C) the male and female pronuclei fuse. D) meiosis occurs. E) gametes are forme

Sperm cannot fertilize an oocyte until they A) undergo capacitation. B) undergo meiosis. C) lose their flagellum. D) are in the vagina for 3 days. E) are a

The placenta is a source of which of the following hormones? A) hCG B) relaxin C) placental lactogen D) progesterone E) All of the answers are correct.

By the end of gestation, maternal blood volume normally increases by almost ________ percent. A) 20 B) 25 C) 50 D) 80 E) 100

Contact of a sperm with the oocyte membrane causes A) oocyte activation. B) completion of the second meiosis. C) extrusion of the second polar body. D) memb

The trophoblast has many of the characteristics of ________ cells. A) cardiac B) cancer C) infectious D) rejuvenating E) epithelial

During gestation, contraction of the myometrium is inhibited by ________, produced by the corpus luteum. A) progesterone B) estrogen C) oxytocin D) prostaglandi

The site where fertilization normally occurs is in the A) cervix. B) fimbrae. C) uterine wall near the fundus. D) outer one-third of the uterine tube. E) u

Initially, the nutrients absorbed by the trophoblast easily reach the inner cell mass by simple A) osmosis. B) diffusion. C) peristalsis. D) ciliary action. E)