Question 1

Which gland is formed by an evagination from the floor of the diencephalon?

Accepted Answer

A)  anterior pituitary gland
B)  posterior pituitary gland
C)  thyroid gland
D)  adrenal glands
E)  pancreasF) C) and D)
G) A) and E)

Question 2

The hormone(s) responsible for preparing the breasts for lactation during pregnancy is (are) .

Accepted Answer

A)  estrogen.
B)  progesterone.
C)  oxytocin.
D)  prolactin.
E)  both estrogen and progesterone.F) A) and E)
G) C) and E)

Question 3

The male and female reproductive systems begin as an indifferent stage.If testosterone is present,which of the following occurs?

Accepted Answer

A)  The paramesonephric duct forms the vagina.
B)  The mesonephric ducts form the ductus deferens.
C)  The mesonephric ducts atrophy.
D)  The paramesonephric ducts enlarge to form the scrotum.
E)  The paramesonephric duct atrophies.F) C) and E)
G) A) and B)

Question 4

Which germ layer is the cardiovascular system derived from?

Accepted Answer

A)  ectoderm
B)  mesoderm
C)  endodermD) B) and C)
E) A) and B)

Question 5

When the embryonic mass of cells develops an internal cavity,the mass of cells is called a(n)

Accepted Answer

A)  zygote.
B)  morula.
C)  blastocyst.
D)  embryonic disc.
E)  trophoblast.F) A) and B)
G) All of the above

Question 6

The embryonic disk is initially composed of

Accepted Answer

A)  ectoderm and hypoblast.
B)  epiblast and mesoderm.
C)  epiblast and hypoblast.
D)  hypoblast and yolk sac.
E)  epiblast and yolk sac.F) A) and E)
G) A) and D)

Question 7

If neither testosterone nor mullerian-inhibiting hormone is secreted during embryonic development

Accepted Answer

A)  the paramesonephric duct system degenerates.
B)  the mesonephric duct system is stimulated.
C)  internally female reproductive structures form.
D)  the individual appears as a male.
E)  internally male reproductive structures form.F) A) and E)
G) B) and E)

Question 8

Which of the following structures is NOT involved in the formation of the face?

Accepted Answer

A)  apical ectodermal ridges
B)  frontonasal process
C)  maxillary processes
D)  mandibular processesE) A) and D)
F) C) and D)

Question 9

The placenta plays an important role in

Accepted Answer

A)  implantation.
B)  onset of lactation.
C)  beginning of parturition.
D)  provision of nutrients to the fetus.
E)  insulating the fetus.F) B) and E)
G) A) and E)

Question 10

When the dominant allele does not completely mask the effects of the recessive allele in the heterozygote,it is called

Accepted Answer

A)  dominance.
B)  polygenic dominance.
C)  codominance.
D)  incomplete dominance.
E)  corecessive.F) B) and D)
G) C) and D)

Question 11

What genetic disorder is characterized by lack of skin,hair,eye coloration?

Accepted Answer

A)  albinism
B)  sickle-cell disease
C)  hemophilia
D)  Down syndrome
E)  achondroplasiaF) None of the above
G) C) and D)

Question 12

Which of the following vitamins are thought to play a role in decreasing the physiological changes in aging?

Accepted Answer

A)  vitamins A and B12
B)  vitamins A and B6
C)  vitamins E and C
D)  vitamins A and D
E)  vitamins A and KF) A) and B)
G) A) and C)

Question 13

Down Syndrome is an example of an aneuploidy called

Accepted Answer

A)  monosomy 21.
B)  trisomy 21.
C)  monosomy 23.
D)  trisomy 17.
E)  disomy 21.F) A) and B)
G) B) and D)

Question 14

If the secondary palate does not fuse the result is a

Accepted Answer

A)  cleft palate.
B)  cleft throat.
C)  facial cleft.
D)  cleft lip.
E)  cleft tongue.F) A) and E)
G) A) and D)

Question 15

Which of the following statements concerning development of the integumentary system is true?

Accepted Answer

A)  The epidermis is derived from mesoderm.
B)  The melanocytes are derived from ectoderm.
C)  Nails,hair,and glands develop from the dermis.
D)  Sensory receptors in the skin are derived from the epidermis.
E)  Collagen fibers do not appear until after birth.F) B) and D)
G) A) and E)

Question 16

Which of the following chromosome anomalies can be found in either sex?

Accepted Answer

A)  Turner's Syndrome (XO) 
B)  Klinefelter's Syndrome (XXY) 
C)  Down Syndrome (Trisomy 21) 
D)  Barker's Syndrome
E)  They all can be found in either sex.F) A) and B)
G) A) and C)

Question 17

What term means that both alleles are different?

Accepted Answer

A)  locus
B)  alleles
C)  homozygous
D)  heterozygous
E)  karyotypeF) A) and B)
G) A) and C)

Question 18

Organogenesis is generally completed by day _____ of development.

Accepted Answer

A)  20
B)  30
C)  45
D)  60
E)  75F) C) and D)
G) B) and D)

Question 19

The cytotrophoblast

Accepted Answer

A)  forms the chorionic villi.
B)  replaces the syncytiotrophoblast.
C)  remains throughout development.
D)  forms branches that protrude into the amniotic cavity.
E)  is not an embryonic part of the placenta.F) None of the above
G) D) and E)

Question 20

The greenish discharge from the lower digestive tract shortly after birth is called

Accepted Answer

A)  colostrum.
B)  jaundice.
C)  bile.
D)  meconium.
E)  prolactin.F) All of the above
G) B) and C)

Exam 29: Development,growth,aging,and Genetics

If neither testosterone nor mullerian-inhibiting hormone is secreted during embryonic development

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Which germ layer is the cardiovascular system derived from?

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Which gland is formed by an evagination from the floor of the diencephalon?

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The hormone(s) responsible for preparing the breasts for lactation during pregnancy is (are) .

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The cytotrophoblast

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Which of the following vitamins are thought to play a role in decreasing the physiological changes in aging?

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Which of the following chromosome anomalies can be found in either sex?

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If the secondary palate does not fuse the result is a

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The greenish discharge from the lower digestive tract shortly after birth is called

Correct AnswerverifiedShow Answer

Down Syndrome is an example of an aneuploidy called

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Which of the following structures is NOT involved in the formation of the face?

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Which of the following statements concerning development of the integumentary system is true?

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What genetic disorder is characterized by lack of skin,hair,eye coloration?

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The embryonic disk is initially composed of

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The placenta plays an important role in

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The male and female reproductive systems begin as an indifferent stage.If testosterone is present,which of the following occurs?

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When the embryonic mass of cells develops an internal cavity,the mass of cells is called a(n)

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What term means that both alleles are different?

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When the dominant allele does not completely mask the effects of the recessive allele in the heterozygote,it is called

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Organogenesis is generally completed by day _____ of development.

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