Question 1

Imagine a drug that causes an increase in the signaling pathway activated by nitric oxide (NO) .What might be the effect of such a drug?

Accepted Answer

A)  increase sperm production
B)  initiate ovulation
C)  produce an erection
D)  downregulate testosteroneE) B) and C)
F) None of the above

Question 2

What is true of the corpus luteum?

Accepted Answer

A)  Secretions of the corpus luteum stimulate LH and FSH secretion.
B)  Secretions of the corpus luteum prepare the uterus for implantation of the embryo.
C)  Secretions of the corpus luteum induce maturation of primary oocytes.
D)  The major hormone secreted from the corpus luteum is estradiol.
E)  The major hormone secreted from the corpus luteum is LH.F) A) and D)
G) A) and E)

Question 3

Maintenance of the uterine lining during pregnancy in mammals requires

Accepted Answer

A)  testosterone.
B)  FSH.
C)  LH.
D)  progesterone.E) All of the above
F) B) and C)

Question 4

Imagine you are a doctor and you are presented with a female patient who has been unable to get pregnant despite 2 years of trying with the same partner. Rank the following factors from most important (#1)  to least important (#4)  in your determination of the cause of her apparent infertility.

Accepted Answer

A)   Her partner's age 
B)   Her age 
C)   Her STD history 
D)   Her hormone levels E) B) and D)
F) A) and C)

Question 5

The endoderm is a germ cell layer that tends to cover the embryo.

Accepted Answer

A) True 
 B)False

Question 6

Damage to the seminal vesicles would prevent sperm from becoming motile.

Accepted Answer

A) True 
 B)False

Question 7

In humans,nitric oxide is an important gaseous neurotransmitter.Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS) .What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?

Accepted Answer

A)  He would be unable to produce all the liquid components of semen.
B)  He would have a low sperm count due to decreased spermatogenesis.
C)  He would have high levels of mutation within his mature sperm.
D)  He would have difficulty getting and/or sustaining an erection.E) All of the above
F) B) and C) D

Question 8

Red blood cells are derived from endoderm.

Accepted Answer

A) True 
 B)False

Question 9

The process by which cells acquire specialized forms and functions is called

Accepted Answer

A)  cell growth.
B)  cell elasticity.
C)  cell differentiation.
D)  cell replication.
E)  None of the choices are correct.F) A) and E)
G) D) and E)

Question 10

What type of contraception is the least effective?

Accepted Answer

A)  RU486
B)  the rhythm method
C)  condoms
D)  birth control pills
E)  All of these contraceptive methods are equally effectivE.F) B) and E)
G) C) and D) B

Question 11

Cleavage occurs after implantation into the lining of the uterus.

Accepted Answer

A) True 
 B)False

Question 12

The central nervous system first forms during

Accepted Answer

A)  fertilization.
B)  cleavage.
C)  neurulation.
D)  gastrulation.
E)  organogenesis.F) A) and B)
G) C) and D)

Question 13

In placental mammals,how does the fetus obtain nutrients and oxygen?

Accepted Answer

A)  Maternal veins and and fetal arteries are directly connected in the chorionic villi.
B)  Diffusion into the umbilical capillaries from maternal blood surrounding the chorionic villi.
C)  Maternal blood cells are carried across the fetal capillary walls through special pores.
D)  Maternal arteries and fetal veins are directly connected in the chorionic villi.
E)  Diffusion into the umbilical cord from maternal blood surrounding the chorionic villi.F) A) and E)
G) A) and D)

Question 14

Neurulation begins with the thickening of the ectoderm over the neural tube.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following represents the proper order of events in embryonic development?

Accepted Answer

A)  fertilization,gastrulation,neurulation,cleavage,organogenesis
B)  fertilization,cleavage,gastrulation,organogenesis,neurulation
C)  fertilization,cleavage,gastrulation,neurulation,organogenesis
D)  fertilization,gastrulation,cleavage,neurulation,organogenesis
E)  fertilization,gastrulation,cleavage,organogenesis,neurulationF) B) and D)
G) A) and E)

Question 16

If a mammalian species that lives in an area with harsh winters and mild springs and summers has a gestation length of five months,when would you expect mating to occur? Assume implantation and pregnancy immediately follow mating.

Accepted Answer

A)  mid-summer
B)  late fall
C)  early spring
D)  mid-springE) None of the above
F) A) and B)

Question 17

In a frog embryo,gastrulation

Accepted Answer

A)  produces a blastocoel displaced into the animal hemisphere.
B)  occurs along the primitive streak in the animal hemisphere.
C)  is impossible because of the large amount of yolk in the egg.
D)  proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore.
E)  occurs within the inner cell mass that is embedded in the large amount of yolk.F) B) and D)
G) All of the above

Question 18

How does the embryo of an egg-laying animal obtain nutrients for growth?

Accepted Answer

A)  from the mother's body
B)  from the yolk of the egg
C)  through tiny pores in the shell of the egg
D)  from the amniotic sac
E)  from the calcium carbonate found in the egg shellF) A) and B)
G) A) and C)

Question 19

The placenta develops from the endometrium while the fetus develops from embryonic tissue.

Accepted Answer

A) True 
 B)False

Question 20

What features would enable a doctor to distinguish conclusively between the proliferative and secretory phases of the uterine cycle?

Accepted Answer

A)   the ratio of estradiol to progesterone
B)   ratio of FSH to LH
C)   thickened endometrium
D)   loss of the endometriumE) B) and C)
F) A) and C) A

Exam 40: Animal Reproduction and Development

Imagine a drug that causes an increase in the signaling pathway activated by nitric oxide (NO) .What might be the effect of such a drug?

Correct AnswerverifiedShow Answer

What is true of the corpus luteum?

Correct AnswerverifiedShow Answer

Maintenance of the uterine lining during pregnancy in mammals requires

Correct AnswerverifiedShow Answer

Imagine you are a doctor and you are presented with a female patient who has been unable to get pregnant despite 2 years of trying with the same partner. Rank the following factors from most important (#1) to least important (#4) in your determination of the cause of her apparent infertility.

Correct AnswerverifiedShow Answer

The endoderm is a germ cell layer that tends to cover the embryo.

Correct AnswerverifiedShow Answer

Damage to the seminal vesicles would prevent sperm from becoming motile.

Correct AnswerverifiedShow Answer

In humans,nitric oxide is an important gaseous neurotransmitter.Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS) .What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?

Correct AnswerverifiedD

Red blood cells are derived from endoderm.

Correct AnswerverifiedShow Answer

The process by which cells acquire specialized forms and functions is called

Correct AnswerverifiedShow Answer

What type of contraception is the least effective?

Correct AnswerverifiedB

Cleavage occurs after implantation into the lining of the uterus.

Correct AnswerverifiedShow Answer

The central nervous system first forms during

Correct AnswerverifiedShow Answer

In placental mammals,how does the fetus obtain nutrients and oxygen?

Correct AnswerverifiedShow Answer

Neurulation begins with the thickening of the ectoderm over the neural tube.

Correct AnswerverifiedShow Answer

Which of the following represents the proper order of events in embryonic development?

Correct AnswerverifiedShow Answer

If a mammalian species that lives in an area with harsh winters and mild springs and summers has a gestation length of five months,when would you expect mating to occur? Assume implantation and pregnancy immediately follow mating.

Correct AnswerverifiedShow Answer

In a frog embryo,gastrulation

Correct AnswerverifiedShow Answer

How does the embryo of an egg-laying animal obtain nutrients for growth?

Correct AnswerverifiedShow Answer

The placenta develops from the endometrium while the fetus develops from embryonic tissue.

Correct AnswerverifiedShow Answer

What features would enable a doctor to distinguish conclusively between the proliferative and secretory phases of the uterine cycle?

Correct AnswerverifiedA

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D

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B

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A