Question 1

In what developmental stage does the human embryo implant in the wall of the uterus?

Accepted Answer

A)  As a zygote
B)  In the morula stage
C)  In the blastocyst stage
D)  In the gastrula stage
E)  During organogenesisF) A) and B)
G) All of the above

Question 2

This figure shows the three phases of fertilization.Which statement is not correct concerning fertilization?

Accepted Answer

A)  Digestive enzymes released from the acrosome eat away the intercellular connections in the corona radiata.
B)  Once a sperm has penetrated the oocyte,the zona pellucida hardens to prevent additional sperm from penetrating.
C)  Only the sperm nucleus enters the oocyte cytoplasm.
D)  Fusion of pronuclei produces a diploid nucleus.
E)  All of the choices are correct.F) D) and E)
G) All of the above

Question 3

A polar body is formed during

Accepted Answer

A)  mitosis.
B)  meiosis I.
C)  meiosis II.
D)  meiosis I and meiosis II.
E)  ovulation.F) D) and E)
G) None of the above

Question 4

The correct chronological pathway of fertilization is

Accepted Answer

A)  zona pellucida penetration  →\rarr→  corona radiata penetration  →\rarr→  pronuclei fusion.
B)  corona radiata penetration  →\rarr→  zona pellucida penetration  →\rarr→  pronuclei fusion.
C)  pronuclei fusion  →\rarr→  corona radiata penetration  →\rarr→  zona pellucida penetration.
D)  pronuclei fusion  →\rarr→  zona pellucida penetration  →\rarr→  corona radiata penetration.
E)  corona radiata penetration  →\rarr→  pronuclei fusion  →\rarr→  zona pellucida penetration. F) B) and D)
G) A) and C)

Question 5

From which primary germ layer is the lining of the digestive tract derived?

Accepted Answer

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

Question 6

A major difference between oogenesis and spermatogenesis is that each cycle of oogenesis results in

Accepted Answer

A)  four viable eggs,whereas a single cycle of spermatogenesis produces only one sperm.
B)  three viable eggs,whereas a single cycle of spermatogenesis produces only one sperm.
C)  only one viable egg,whereas a single cycle of spermatogenesis produces four spermatozoa.
D)  three viable polar bodies,whereas a single cycle of spermatogenesis produces no polar bodies.
E)  a tiny viable egg,whereas a single cycle of spermatogenesis produces four sperm,each much larger than the egg.F) C) and D)
G) B) and C)

Question 7

Of the millions of sperm deposited into the vagina during intercourse,only a few hundred reach the secondary oocyte.What happens to the rest?

Accepted Answer

A)  Many leak out of the vagina.
B)  Some never become motile.
C)  They may be destroyed by the acidic environment of the female tract.
D)  They may become disoriented and lose direction.
E)  All of the choices are correct.F) All of the above
G) C) and E)

Question 8

During which fetal stage do reproductive organs and permanent kidneys begin to develop?

Accepted Answer

A)  Weeks 1-8
B)  Weeks 9-12
C)  Weeks 13-16
D)  Weeks 17-20
E)  Weeks 21-38F) A) and B)
G) C) and E)

Question 9

From which primary germ layer is the gall bladder derived?

Accepted Answer

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

Question 10

What happens to the polar bodies that are produced during oogenesis?

Accepted Answer

A)  They participate in the formation of the extra-embryonic membranes.
B)  They provide yolk to nourish the early embryo.
C)  They help to form the placenta.
D)  They degenerate.
E)  They are incorporated into the inner cell mass.F) A) and D)
G) D) and E)

Question 11

Differentiation refers to the

Accepted Answer

A)  moment of conception (when sperm and egg unite) .
B)  time when the blastocyst implants in the uterine wall.
C)  formation and organization of the diverse cell types in the body.
D)  formation of the various organ systems in the body.
E)  separation of the placenta from the fetus at birth.F) A) and B)
G) B) and E)

Question 12

The implantation process begins by about day _____ following fertilization.

Accepted Answer

A)  2
B)  4
C)  7
D)  10
E)  12F) B) and C)
G) A) and D)

Question 13

The fetal portion of the placenta forms from the

Accepted Answer

A)  amnion.
B)  yolk sac.
C)  inner cell mass.
D)  chorion.
E)  blastocoel.F) C) and E)
G) D) and E)

Question 14

What happens during gastrulation?

Accepted Answer

A)  The three primary germ layers are formed.
B)  The embryo implants in the wall of the uterus.
C)  The placenta becomes functional.
D)  The chorion disintegrates.
E)  The amnionic fluid appears.F) C) and D)
G) A) and E)

Question 15

Which is true regarding the process of meiosis?

Accepted Answer

A)  Meiosis begins in a haploid state and concludes in the diploid condition.
B)  Meiosis forms haploid daughter cells from a diploid cell.
C)  Meiosis is represented by the notation: n  →\rarr→  2n.
D)  Most growth in the body is accomplished through meiosis.
E)  Meiosis results in identical sex cells. F) B) and E)
G) A) and D)

Question 16

Two standard measurements are used to determine fetal length.Which of these would be the longer of the two measurements on any normal fetus?

Accepted Answer

A)  CHL
B)  CRL
C)  HTL
D)  HRL
E)  CFLF) A) and E)
G) A) and B)

Question 17

This figure shows a sperm cell.What structure does number 1 indicate?

Accepted Answer

A)  Flagellum
B)  Acrosome
C)  Nucleus
D)  Midpiece
E)  CrownF) A) and C)
G) C) and D)

Question 18

The embryonic period occurs during the

Accepted Answer

A)  first three weeks of development.
B)  third through the eighth week of development.
C)  eighth through the twenty-fourth week of development.
D)  last eight weeks of development.
E)  full term of pregnancy.F) None of the above
G) A) and D)

Question 19

What process does the pre-embryo undergo in order to from into a tightly grouped ball of cells?

Accepted Answer

A)  Meiosis
B)  Implantation
C)  Dissolution
D)  Compaction
E)  MorulationF) C) and D)
G) A) and B)

Question 20

Trisomy refers to

Accepted Answer

A)  the development of three primary germ layers.
B)  three layers of cells.
C)  the formation of triplets.
D)  there being three copies of a given chromosome instead of two.
E)  the formation of the three extra-embryonic membranes.F) A) and D)
G) A) and C)

Exam 3: Embryology

The correct chronological pathway of fertilization is

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In what developmental stage does the human embryo implant in the wall of the uterus?

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From which primary germ layer is the gall bladder derived?

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Differentiation refers to the

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Trisomy refers to

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What happens during gastrulation?

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This figure shows a sperm cell.What structure does number 1 indicate?

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During which fetal stage do reproductive organs and permanent kidneys begin to develop?

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What happens to the polar bodies that are produced during oogenesis?

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Of the millions of sperm deposited into the vagina during intercourse,only a few hundred reach the secondary oocyte.What happens to the rest?

Correct AnswerverifiedShow Answer

Two standard measurements are used to determine fetal length.Which of these would be the longer of the two measurements on any normal fetus?

Correct AnswerverifiedShow Answer

From which primary germ layer is the lining of the digestive tract derived?

Correct AnswerverifiedShow Answer

A polar body is formed during

Correct AnswerverifiedShow Answer

This figure shows the three phases of fertilization.Which statement is not correct concerning fertilization?

Correct AnswerverifiedShow Answer

Which is true regarding the process of meiosis?

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The implantation process begins by about day _____ following fertilization.

Correct AnswerverifiedShow Answer

The fetal portion of the placenta forms from the

Correct AnswerverifiedShow Answer

A major difference between oogenesis and spermatogenesis is that each cycle of oogenesis results in

Correct AnswerverifiedShow Answer

The embryonic period occurs during the

Correct AnswerverifiedShow Answer

What process does the pre-embryo undergo in order to from into a tightly grouped ball of cells?

Correct AnswerverifiedShow Answer

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