21) The sequence of development of sperm is:
A) primary spermatocyte, : 1380982.
21) The sequence of development of sperm is:
A) primary spermatocyte, secondary spermatocyte, tertiary spermatocyte, spermatid, sperm.
B) primary spermatocyte, spermatogonia, sperm.
C) immature sperm, mature sperm, secondary sperm, spermatocyte.
D) spermatogonia, spermatocyte, spermatid, sperm.
22) When a spermatogonium divides, it produces one primary spermatocyte and:
A) two secondary spermatocytes.
B) one spermatogonium.
C) one spermatid.
D) one nurse cell.
23) Sperm development takes about:
A) 1 month.
B) 28 days.
C) 6 months.
D) 2.5 months.
24) A fertility doctor is trying to determine why a couple is infertile. It has been determined that the woman is fertile, so the problem may be with the man. In analyzing his semen, the doctor notices adequate sperm production, but the sperm are largely inactive. He concludes that the semen may be lacking in proper nutrients for the sperm. Which structure would be the most likely candidate for the source of the problem?
A) urethra
B) seminiferous tubules
C) vas deferens
D) seminal vesicles
25) Why is it useful for accessory glands to produce alkaline substances to accompany sperm?
A) Alkaline substances neutralize the acidic environment of the vagina.
B) Alkaline substances produce a pH optimum for nutrient absorption.
C) Alkaline substances are mainly fats used for energy.
D) Alkaline substances function as enzymes needed for swimming.
26) A man has been experiencing reduced urine flow problems. After examination by his doctor, the diagnosis is an enlarged prostate gland. What is the connection between prostate enlargement and reduced urine flow?
A) The prostate is located where the ureters enter the bladder.
B) The prostate surrounds the urethra, the tube that transmits sperm and urine.
C) An enlarged prostate is a sign of cancer that affects the kidneys.
D) An enlarged prostate is a sign of cancer that affects the bladder.
27) The portion of a sperm that carries enzymes needed for fertilization is the:
A) tail.
B) nucleus.
C) acrosome.
D) mitochondrion.
28) Which of the following statements concerning sperm and fertilization is correct?
A) The first sperm that approaches the egg is the one to fertilize the egg.
B) Many sperm release their enzymes before one can get through.
C) The first capacitated sperm fertilizes the egg.
D) Several sperm must contribute their DNA to the egg for fertilization to occur.
29) What prevents multiple sperm from fertilizing one egg?
A) release of granules that harden the membrane outside of the oocyte
B) atresia
C) phagocytosis by accessory cells once one sperm contacts the membrane
D) egg immediately divides and becomes impervious to sperm
30) An ectopic pregnancy is:
A) implantation of the embryo in the uterus.
B) another name for fraternal twins.
C) another name for identical twins.
D) attachment of an embryo outside the uterus.
21) The sequence of development of sperm is:
A) primary spermatocyte, : 1380982
