Question 1

A mutation in mice leads to overgrowth of the Sertoli cells,so they span across the diameter of the seminiferous tubules.What phenotype would you expect to see?

Accepted Answer

A)  infertility due to lack of mature oocytes
B)  overproduction of sperm,so they clog the bulbourethral gland
C)  overproduction of testosterone
D)  infertility due to lack of mature sperm entering the epididymisE) A) and B)
F) B) and C)

Question 2

Paland and Lynch showed that sexual populations have fewer deleterious mutations than asexual populations.What hypothesis do these results support?

Accepted Answer

A)  sexual reproduction prevents fertilization with gametes carrying alleles with deleterious alleles.
B)  sexual reproduction produces fewer random mutations than asexual reproduction.
C)  asexual reproduction is associated with lower genetic diversity,resulting in the accumulation of highly deleterious mutations.
D)  in sexual reproduction,the reassorting of alleles allows for the elimination of more detrimental alleles than in asexual reproduction.
E)  sexual strains are associated with higher genetic diversity and thus accumulate more beneficial mutations than asexual strains.F) A) and D)
G) B) and E)

Question 3

Stem cells (unspecialized cells) that develop into bone cells have undergone which type of process?

Accepted Answer

A)  involution
B)  embryonic development
C)  cellular differentiation
D)  cellular respirationE) A) and D)
F) A) and C)

Question 4

Which one of the structures below does NOT develop during neurulation?

Accepted Answer

A)  cells that form pigment
B)  the central nervous system
C)  the neural crest
D)  the archenteron
E)  somitesF) B) and D)
G) C) and E)

Question 5

What stage of development involves cell division without cell growth?

Accepted Answer

A)  fertilization
B)  cleavage
C)  neurulation
D)  gastrulation
E)  organogenesisF) All of the above
G) B) and E)

Question 6

The posterior end of the neural tube will develop into the brain.

Accepted Answer

A) True 
 B)False

Question 7

In chordates,which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?

Accepted Answer

A)  archenteron
B)  neural tube
C)  notochord
D)  epidermis
E)  intestinal tractF) C) and D)
G) B) and D)

Question 8

A certain drug has a side-effect of disrupting levels of luteinizing hormone (LH) .Which patients should be advised that this drug could affect their fertility?

Accepted Answer

A)  Men
B)  Women
C)  Men and women
D)  Neither -- it would only disrupt late fetal development.E) All of the above
F) A) and B)

Question 9

Place the following events of the acrosomal reaction in the correct chronological order.
(1) The acrosome releases hydrolytic enzymes.
(2) Sperm-binding proteins on the membrane bind the sperm.
(3) Sperm nucleus enters the egg.
(4) Sperm and egg plasma membranes fuse.
(5) Sperm contacts the egg's jelly coat.

Accepted Answer

A)  5,1,2,4,3
B)  1,5,4,3,2
C)  1,2,4,3,5
D)  5,2,4,3,1
E)  3,5,2,1,4F) None of the above
G) A) and E)

Question 10

The cortical reaction causes

Accepted Answer

A)  the vitelline layer to harden.
B)  the embryo to embed into the uterus.
C)  egg membrane depolarization.
D)  the sperm to bind to the egg membrane.
E)  follicle maturation.F) A) and D)
G) D) and E)

Question 11

What allows fetal hemoglobin to remove oxygen from maternal hemoglobin?

Accepted Answer

A)  Fetal hemoglobin has an extra heme group.
B)  Oxygen is more soluble in fetal blood than maternal blood.
C)  Fetal hemoglobin has a higher affinity for oxygen than does maternal hemoglobin.
D)  Fetal blood contains twice as many hemoglobin molecules than maternal blooD.
E)  Fetal hemoglobin molecules are much larger than maternal hemoglobin molecules.F) A) and B)
G) A) and D)

Question 12

Place the events of parturition in the correct order.
(1) Stretch-sensitive neurons send signals to the hypothalamus.
(2) Oxytocin receptors increase in the uterus.
(3) Prostaglandin levels increase.
(4) Estradiol levels increase.
(5) Oxytocin levels increase.
(6) Uterine muscles start to contract.

Accepted Answer

A)  1,2,4,5,3,6
B)  4,2,1,5,6,3
C)  5,2,4,1,3,6
D)  1,6,4,2,5,3
E)  4,3,1,2,5,6F) C) and D)
G) None of the above

Question 13

The sharp peak of estradiol secretion during the ovarian cycle

Accepted Answer

A)  inhibits the secretion of LH and FSH.
B)  stimulates the secretion of LH and ovulation.
C)  stimulates growth of the uterine lining.
D)  stimulates completion of meiosis I.
E)  inhibits progesterone production.F) A) and D)
G) A) and E)

Question 14

Neural crest cells at the dorsal surface of the neural tube

Accepted Answer

A)  form the notochord.
B)  form the overlying ectoderm.
C)  migrate to many different regions of the body.
D)  differentiate into the brain.
E)  control the segmentation of somatic mesoderm.F) A) and C)
G) None of the above

Question 15

What would happen if the cortical reaction proceeded before the acrosomal reaction was complete?

Accepted Answer

A)  Fertilization would not occur.
B)  This is the normal situation.
C)  Multiple sperm would fertilize the egg.
D)  Twins may form.E) B) and D)
F) B) and C)

Question 16

Why don't chickens menstruate?

Accepted Answer

A)  It has been bred out of them.
B)  The early embryo receives nutrients from the egg yolk.
C)  The corpus luteum of a chicken is much smaller and passes without notice.
D)  The eggshell serves the same purpose as the endometrium.E) A) and B)
F) B) and C)

Question 17

What are the three glands that produce the liquid portion of semen?

Accepted Answer

A)  prostate,seminal vesicles,bulbourethral
B)  hypothalamus,prostate,Leydig
C)  Leydig,prostate,bulbourethral
D)  seminal vesicles,hypothalamus,bulbourethral
E)  seminal vesicle,Leydig,hypothalamusF) A) and C)
G) A) and B)

Question 18

Mesoderm gives rise to

Accepted Answer

A)  epidermis.
B)  respiratory tract.
C)  digestive tract.
D)  skeletal muscle.
E)  peripheral nervous system.F) A) and D)
G) None of the above

Question 19

One type of illegal doping in sports is the abuse of anabolic steroids such as testosterone.Doctors measure the testosterone (T) to LH ratio in athletes' urine to detect such doping.Why is this an effective indicator?

Accepted Answer

A)  Testosterone upregulates LH,so the doping athlete will have an unusually low T/LH ratio.
B)  LH downregulates testosterone,so the doping athlete will have an unusually low T/LH ratio.
C)  LH has negative feedback onto testosterone,so the doping athlete will have an unusually high T/LH ratio.
D)  Testosterone has negative feedback onto LH production,so the doping athlete will have an unusually high T/LH ratio.E) B) and C)
F) B) and D)

Question 20

Erection occurs when

Accepted Answer

A)  the spongy erectile tissue of the penis becomes engorged with blood.
B)  the veins flowing out of the penis vasoconstrict.
C)  the arteries of the penis vasodilate.
D)  nitric oxide is releaseD.
E)  All of these events occur to promote an erection.F) A) and B)
G) B) and E)

Exam 40: Animal Reproduction and Development

A certain drug has a side-effect of disrupting levels of luteinizing hormone (LH) .Which patients should be advised that this drug could affect their fertility?

Correct Answer
verified

Place the events of parturition in the correct order. (1) Stretch-sensitive neurons send signals to the hypothalamus. (2) Oxytocin receptors increase in the uterus. (3) Prostaglandin levels increase. (4) Estradiol levels increase. (5) Oxytocin levels increase. (6) Uterine muscles start to contract.

Correct Answer
verified

What allows fetal hemoglobin to remove oxygen from maternal hemoglobin?

Correct Answer
verified

What would happen if the cortical reaction proceeded before the acrosomal reaction was complete?

Correct Answer
verified

The sharp peak of estradiol secretion during the ovarian cycle

Correct Answer
verified

Stem cells (unspecialized cells) that develop into bone cells have undergone which type of process?

Correct Answer
verified

Which one of the structures below does NOT develop during neurulation?

Correct Answer
verified

Why don't chickens menstruate?

Correct Answer
verified

Mesoderm gives rise to

Correct Answer
verified

In chordates,which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?

Correct Answer
verified

Correct Answer
verified

Erection occurs when

Correct Answer
verified

Neural crest cells at the dorsal surface of the neural tube

Correct Answer
verified

One type of illegal doping in sports is the abuse of anabolic steroids such as testosterone.Doctors measure the testosterone (T) to LH ratio in athletes' urine to detect such doping.Why is this an effective indicator?

Correct Answer
verified

A mutation in mice leads to overgrowth of the Sertoli cells,so they span across the diameter of the seminiferous tubules.What phenotype would you expect to see?

Correct Answer
verified

Paland and Lynch showed that sexual populations have fewer deleterious mutations than asexual populations.What hypothesis do these results support?

Correct Answer
verified

The cortical reaction causes

Correct Answer
verified

What stage of development involves cell division without cell growth?

Correct Answer
verified

What are the three glands that produce the liquid portion of semen?

Correct Answer
verified

The posterior end of the neural tube will develop into the brain.

Correct Answer
verified

Exam 40: Animal Reproduction and Development

A certain drug has a side-effect of disrupting levels of luteinizing hormone (LH) .Which patients should be advised that this drug could affect their fertility?

Correct AnswerverifiedShow Answer

Place the events of parturition in the correct order. (1) Stretch-sensitive neurons send signals to the hypothalamus. (2) Oxytocin receptors increase in the uterus. (3) Prostaglandin levels increase. (4) Estradiol levels increase. (5) Oxytocin levels increase. (6) Uterine muscles start to contract.

Correct AnswerverifiedShow Answer

What allows fetal hemoglobin to remove oxygen from maternal hemoglobin?

Correct AnswerverifiedShow Answer

What would happen if the cortical reaction proceeded before the acrosomal reaction was complete?

Correct AnswerverifiedShow Answer

The sharp peak of estradiol secretion during the ovarian cycle

Correct AnswerverifiedShow Answer

Stem cells (unspecialized cells) that develop into bone cells have undergone which type of process?

Correct AnswerverifiedShow Answer

Which one of the structures below does NOT develop during neurulation?

Correct AnswerverifiedShow Answer

Why don't chickens menstruate?

Correct AnswerverifiedShow Answer

Mesoderm gives rise to

Correct AnswerverifiedShow Answer

In chordates,which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Erection occurs when

Correct AnswerverifiedShow Answer

Neural crest cells at the dorsal surface of the neural tube

Correct AnswerverifiedShow Answer

One type of illegal doping in sports is the abuse of anabolic steroids such as testosterone.Doctors measure the testosterone (T) to LH ratio in athletes' urine to detect such doping.Why is this an effective indicator?

Correct AnswerverifiedShow Answer

A mutation in mice leads to overgrowth of the Sertoli cells,so they span across the diameter of the seminiferous tubules.What phenotype would you expect to see?

Correct AnswerverifiedShow Answer

Paland and Lynch showed that sexual populations have fewer deleterious mutations than asexual populations.What hypothesis do these results support?

Correct AnswerverifiedShow Answer

The cortical reaction causes

Correct AnswerverifiedShow Answer

What stage of development involves cell division without cell growth?

Correct AnswerverifiedShow Answer

What are the three glands that produce the liquid portion of semen?

Correct AnswerverifiedShow Answer

The posterior end of the neural tube will develop into the brain.

Correct AnswerverifiedShow Answer

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