Carlson: Human Embryology and Developmental Biology, 5th Edition

Chapter 01: Getting Ready for Pregnancy

Test Bank

Multiple Choice

1.	In a court case, a company was sued because a pregnant woman was exposed to chemical vapors one day and subsequently gave birth to an infant with a cleft lip/palate. The embryo was said to have had a menstrual age of 10 weeks at the time of exposure. What was the fertilization age of the embryo?
A.	6 weeks
B.	8 weeks
C.	10 weeks
D.	12 weeks
E.	14 weeks

ANS: B

2.	The first meiotic block in the human female gamete occurs in the ____________.
A.	Zygotene stage
B.	Diplotene stage
C.	Diakinesis stage
D.	Metaphase I stage
E.	Metaphase II stage

ANS: B

3.	As spermatozoa leave the testes and are joined by fluids from the prostate and seminal vesicles, they become motile because seminal fluid contains an external energy source. What is that energy source?
A.	Glucose
B.	Glycogen
C.	Ca++
D.	Fructose
E.	K+

ANS: D

4.	
What is a major function of protamines in spermatogenesis?
A.	They prevent autoimmune reactions against the spermatozoa.
B.	They are instrumental in the formation of the acrosome.
C.	They are associated with the membrane receptors for luteinizing hormone on the primary spermatocyte.
D.	They displace nuclear histones and allow compaction of the nuclear chromatin.
E.	They coat the maturing spermatozoa in the epididymis.

ANS: D

5.	In a lawsuit, a woman contends that a congenital malformation of her child was due to her falling down on an icy sidewalk when she was in her eighth week of pregnancy (menstruation age). How many weeks after fertilization (fertilization age) was the embryo at the time of the fall?
A.	4 weeks
B.	6 weeks
C.	8 weeks
D.	10 weeks
E.	12 weeks

ANS: B

6.	After it leaves a seminiferous tubule of the testes, a spermatozoon that fertilizes an ovum spends the longest time in the ____________.
A.	Epididymis
B.	Ductus deferens
C.	Seminal vesicle
D.	Cervical crypt
E.	Uterine tube

ANS: A

7.	An alkaline fluid secreted by the ________ helps to raise the pH of the upper vagina after insemination.
A.	Testes
B.	Ovaries
C.	Prostate
D.	Seminal vesicles
E.	None of the above

ANS: D

8.	
Two systems—menstrual age and fertilization age—are used in signifying the age of embryos. To convert from menstrual age to fertilization age:
A.	Add 1 week
B.	Add 2 weeks
C.	Subtract 1 week
D.	Subtract 2 weeks

ANS: D

9.	A woman is told by her obstetrician that she is already 7 weeks pregnant. What is the fertilization age of her embryo?
A.	5 weeks
B.	6 weeks
C.	7 weeks
D.	8 weeks
E.	9 weeks
	
ANS: A

10.	Functional maturation of spermatozoa occurs in the _________.
A.	Epididymis
B.	Ductus deferens
C.	Prostate
D.	Seminal vesicle
E.	Upper vagina

ANS: A