Spermatogenesis Review Quiz

 

1. In the male, estradiol only has a negative feedback effect on the levels of GnRH.
True
False
2. GnRH binds to receptors on the surface of Leydig cells and via a calcium second messenger system, testosterone production and secretion is increased.
True
False
3. In the bull, spermatogenesis involves the mitotic divisions of the sequence: Spermatogonium A to I to B and finally a primary spermatocyte.
True
False
4. Meiosis is a part of spermatocytogenesis.
True
False
5. In the bull, there is the potential to produce 64 round spermatids from each type A spermatogonium that enters into spermatogenesis. However this amount rarely occurs due to the natural process of apoptosis.
True
False
6. Cytoplasmic bridges are a likely explanation for why protein expression on the surface of spermatozoa is not different between X and Y spermatozoa.
True
False
7. Indentify which of the following will increase apoptosis in stallions.
Going from April to November.
Being exposed to trichamoniasis.
Being kicked in the groin by a mare that was not in heat. Swelling did oocur from this incidence.
An injection of testosterone.
An increase in fat accumilation in the scrotum such that the testis temperature increases.
Testicular torsion.
8. In the bull FSH is involved in the stimulation of mitotic divisions of spermatogonia type A while in the primate it causes the entry of stem cell spermatogonia into the proliferating pool.
True
False
9. The golgi phase of spermiogenesis involves which of the following; (identify all that apply)
Proacrosomal granules are formed from the golgi apparatus.
Acrosomal granules come together to intiate the formation of the acrosome.
Migration of the centrioles.
Elongation of the acrosome.
Elongation of the flagellum.
The acrosome is completed.
The mitochondria migrate around the flagellum.
Dense fibers form.
10. The cap phase of spermiogenesis involves which of the following; (identify all that apply)
Proacrosomal granules are formed from the golgi apparatus.
Acrosomal granules come together to intiate the formation of the acrosome.
Migration of the centrioles.
Elongation of the acrosome.
Elongation of the flagellum.
The acrosome is completed.
The mitochondria migrate around the flagellum.
Dense fibers form.
11. The acrosomal phase of spermiogenesis involves which of the following; (identify all that apply)
Proacrosomal granules are formed from the golgi apparatus.
Acrosomal granules come together to intiate the formation of the acrosome.
Migration of the centrioles.
Elongation of the acrosome.
Elongation of the flagellum.
The acrosome is completed.
The mitochondria migrate around the flagellum.
Dense fibers form.
12. The maturation phase of spermiogenesis involves which of the following; (identify all that apply)
Proacrosomal granules are formed from the golgi apparatus.
Acrosomal granules come together to intiate the formation of the acrosome.
Migration of the centrioles.
Elongation of the acrosome.
Elongation of the flagellum.
The acrosome is completed.
The mitochondria migrate around the flagellum.
Dense fibers form.
13. Spermiation is the release of spermatozoa from Sertoli cells and the phagocytosis of the residual bodies by the Sertoli cells.
True
False
14. A reseacher examines a cross section of a rocky mountain sheep testis and observes that in some of the seminiferous tubules are type A spermatogonia, primary spermatocytes and round spermatids with the start of acrosomal granules. In other semiferous tubules he observes type A spermatogonia, type B spermatogonia, primary spermatocytes and elongated spermatids. These observations are evidence of
spermiogenesis.
meiosis.
cycles.
stages.
15. A research article says that exposure to cadmium was found to lengthen cycles of the seminiferous epithelium by 2 days. This will result in spermatogenesis to be lengthen by approximately 9-10 days.
True
False
16. The daily sperm production is largest among the farm animals in the boar because of (indicate all that apply)
testicular size
short length of cycles
short length of stages
waves in the seminiferous tubules
17. The blood testis barrier forms in the bull
prior to birth but after the testes descend into the scrotum.
by 3-6 months of age as the testis is growing but prior to puberty.
at 11 - 12 months of age when puberty begins.
at 5 years of age.
18. If the blood testis barrier fails to form, then mitosis but not meiosis will occur in the adult male.
True
False
19. Indicate the cells which are present in the adluminal compartment of the seminiferous tubules.
Type A spermatogonia
Type I spermatogonia
Type B spermatogonia
Primary Spermatocyte
Secondary Spermatocyte
Round spermatid
elongated spermatid
20. A human male is found to express a genetic mutation in the BCL gene that is involved in apoptosis. As a consequence, apoptosis is inhibited. This individual would be
fertile as this would not affect spermatogenesis.
Sterile as the blood testis barrier would be destroyed if apoptosis did not occur in spermatogonia.
Sterile because Sertoli cells would over populate the seminiferous tubules.
Infertile as some damaged spermatogonia would now develop into ejaculated spermatozoa.