Question 1

An embryo becomes a fetus about

Accepted Answer

A)   14 days after fertilization.
B)   30 days after fertilization.
C)   60 days after fertilization.
D)   3 months after fertilization.
E)   6 months after fertilization.F) A) and E)
G) A) and B)

Question 2

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

Accepted Answer

A)   Turner Syndrome (XO) 
B)   Klinefelter Syndrome (XXY) 
C)   Down Syndrome (Trisomy 21) 
D)   Barker Syndrome
E)   All of the choices are correct.F) D) and E)
G) A) and B)

Question 3

The oropharyngeal and cloacal membranes, when opened, allow the ________ to open to the outside.

Accepted Answer

A)   liver
B)   skin
C)   lungs
D)   digestive tract
E)   earsF) All of the above
G) B) and D)

Question 4

Which germ layer is covering of the exposed region of the tooth derived from?

Accepted Answer

A)   Ectoderm
B)   Mesoderm
C)   EndodermD) A) and B)
E) A) and C)

Question 5

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 sacF) C) and D)
G) A) and B)

Question 6

The lungs develop from

Accepted Answer

A)   somitomeres.
B)   neural crest cells.
C)   an evagination from the foregut.
D)   an evagination from the floor of the diencephalon.
E)   an invagination from the hindgut.F) A) and D)
G) C) and D)

Question 7

The inclusion of ________ in a woman's diet during the early stages of her pregnancy significantly reduces the risk for neural tube defects in her developing embryo.

Accepted Answer

A)   Vitamin E
B)   Vitamin D
C)   Vitamin A
D)   Folic acid
E)   CalciumF) None of the above
G) A) and D)

Question 8

The prenatal period during which the major organ systems form is the ________ period.

Accepted Answer

A)   fetal
B)   germinal
C)   embryonic
D)   neonatalE) A) and D)
F) All of the above

Question 9

What is the acrosomal reaction?

Accepted Answer

A)   The formation of the acrosome in the epididymis
B)   The activation of enzymes for action on the surface of the oocyte
C)   The release of ADP from the mitochondria on the midpiece
D)   The release of prostatic fluid to produce the semenE) C) and D)
F) None of the above

Question 10

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

Accepted Answer

A)   colostrum
B)   jaundice
C)   bile
D)   meconium
E)   prolactinF) A) and D)
G) A) and E)

Question 11

The embryonic membrane that completely encloses the embryo in a watery sac is the ________.

Accepted Answer

A)   yolk sac
B)   amnion
C)   allantois
D)   chorion
E)   ectodermal sacF) B) and E)
G) A) and B)

Question 12

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) None of the above
F) A) and B)

Question 13

The major difference between an embryo and a fetus is that

Accepted Answer

A)   a fetus can survive outside the mother's womb but an embryo cannot.
B)   a fetus is smaller than an embryo.
C)   organ systems are developing in an embryo while all organs are present in a fetus.
D)   a fetus is a male child while an embryo is a female child.
E)   None of the choices are correct.F) B) and C)
G) A) and D)

Question 14

What event separates childhood from adolescence?

Accepted Answer

A)   Onset of puberty
B)   Infancy
C)   Formation of germ layers
D)   Beginning to walkE) A) and C)
F) None of the above

Question 15

Some epiblast cells migrate and emerge between the epiblast and endoderm as a new germ layer called the ________.

Accepted Answer

A)   yolk sac
B)   mesoglia
C)   notochord
D)   mesoderm
E)   primitive streakF) D) and E)
G) A) and D)

Question 16

Before parturition,

Accepted Answer

A)   the placenta secretes increased amounts of oxytocin.
B)   the uterus stretches, causing the release of ACTH from the adenohypophysis.
C)   there is an increase in the stimulatory effects of progesterone on the uterine muscle.
D)   prostaglandin synthesis is inhibited.
E)   fetal glucocorticoids decrease the production of progesterone by the placenta.F) A) and D)
G) A) and C)

Question 17

Once the embryonic mass has 12 or more cells, it is called a ________.

Accepted Answer

A)   morula
B)   gastrula
C)   blastula
D)   blastocyst
E)   trophoblastF) B) and D)
G) B) and C)

Question 18

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 tongueF) All of the above
G) None of the above

Question 19

Colostrum differs from milk in that it contains ________.

Accepted Answer

A)   little fat
B)   no antibodies
C)   more protein
D)   more lactose
E)   more fatF) All of the above
G) A) and D)

Question 20

By the end of 8 weeks, the individual is considered a fetus because

Accepted Answer

A)   all the primary germ layers are formed.
B)   the amniotic cavity has formed.
C)   all of the organ systems are present.
D)   the neural tube and yolk sac have formed.
E)   the mesoderm has formed.F) All of the above
G) B) and C)

Exam 29: Development, Growth, Aging, and Genetics

The prenatal period during which the major organ systems form is the ________ period.

Correct AnswerverifiedShow Answer

An embryo becomes a fetus about

Correct AnswerverifiedShow Answer

What is the acrosomal reaction?

Correct AnswerverifiedShow Answer

Colostrum differs from milk in that it contains ________.

Correct AnswerverifiedShow Answer

The embryonic disk is initially composed of ________.

Correct AnswerverifiedShow Answer

The major difference between an embryo and a fetus is that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The inclusion of ________ in a woman's diet during the early stages of her pregnancy significantly reduces the risk for neural tube defects in her developing embryo.

Correct AnswerverifiedShow Answer

By the end of 8 weeks, the individual is considered a fetus because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The lungs develop from

Correct AnswerverifiedShow Answer

The oropharyngeal and cloacal membranes, when opened, allow the ________ to open to the outside.

Correct AnswerverifiedShow Answer

Some epiblast cells migrate and emerge between the epiblast and endoderm as a new germ layer called the ________.

Correct AnswerverifiedShow Answer

What event separates childhood from adolescence?

Correct AnswerverifiedShow Answer

Before parturition,

Correct AnswerverifiedShow Answer

The embryonic membrane that completely encloses the embryo in a watery sac is the ________.

Correct AnswerverifiedShow Answer

If the secondary palate does not fuse, the result is a ________.

Correct AnswerverifiedShow Answer

Which germ layer is covering of the exposed region of the tooth derived from?

Correct AnswerverifiedShow Answer

Once the embryonic mass has 12 or more cells, it is called a ________.

Correct AnswerverifiedShow Answer

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