Histology, Cytology & Embryology MCQ Modules

1) regarding corpus luteum which is incorrect : a- it developed under the effect of LH b- it secretes progesterone c- when pregnancy occurs degeneration of corpus luteum is preventedby hCG d- if oocyte is not fertilized the corpus luteum degenerate 10-12 days after ovulation e- corpus luteum of pregnancy remain active throughout the gastation period   2) which of the following component plays the most active role in invading the endometrium during implantation: a- epiblast b- syncytiotrophoblast c- hypoblast d- extraembryonic somatic mesoderm e- extraembryonic splanchnic mesoderm   3) proliferative phase is influenced by the following hormones: a- estrogen

1. This phase in the development of sperm has no counterpart in ovum-development (a) spermiogenesis (b) phase of multiplication (c) phase of growth (d) polar body formation Answer: (a)   2. During this phase, the nuclear envelope begins to disappear (a) cytokinesis (b) S phase (c) Anaphase (d) Prometaphase Answer: (d)   3. In humans, the number of ova and sperms that would be produced from 100 secondary oocytes and 100 secondary spermatocytes during gametogenesis is (a) 50 ova, 100 sperms (b) 100 ova, 100 sperms (c) 100 ova, 200 sperms (d) 200 ova, 200 sperms Answer: (c)   4.

Directions: each of the following statements contains five suggested completions. Choose the one that is best in each case. 1. Each of the following statements concerning the plasmalemma is true, EXCEPT:    A – includes elementary cell membrane;     B – its supermembranous layer consists of glycolipids and glycoproteins;     C – its submembranous layer contains filaments and microtubules;     D – is a semi-permeable cell boundary;     E – is not an obligatory cell component. 2. The plasma membrane functions are as follows, EXCEPT:    A – is a selectively permeable barrier;    B –