Question 1

-This figure depicts cleavage.What structure does number 3 indicate?

Accepted Answer

A)  Trophoblast
B)  Zona pellucida
C)  Embryoblast
D)  Chorionic villi
E)  Yolk sacF) A) and D)
G) None of the above

Question 2

Reduction division occurs during

Accepted Answer

A)  mitosis.
B)  meiosis.
C)  both mitosis and meiosis.D) A) and B)
E) B) and C)

Question 3

From which primary germ layer is the thyroid gland derived?

Accepted Answer

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

Question 4

From which primary germ layer are muscles derived?

Accepted Answer

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

Question 5

The hormone hCG (human chorionic gonadotropin) is produced by the

Accepted Answer

A)  chorion.
B)  cytotrophoblast.
C)  endometrium.
D)  corpus luteum.
E)  syncytiotrophoblast.F) B) and D)
G) C) and D)

Question 6

What is the name given to substances that can cause birth defects or even death if exposure to them occurs during the embryonic period?

Accepted Answer

A)  Mutagens
B)  Antibiotics
C)  Fungicides
D)  Teratogens
E)  PesticidesF) A) and E)
G) C) and D)

Question 7

From which primary germ layer is the nervous system derived?

Accepted Answer

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

Question 8

Formation of the neural tube

Accepted Answer

A)  begins at the anterior (head) end and proceeds toward the posterior (tail) .
B)  begins at the posterior and proceeds toward the anterior.
C)  begins in the middle and proceeds toward the head and the tail.
D)  is random in that it can begin and proceed at any location along the neural plate.
E)  is caused by compaction of the neural plate.F) A) and C)
G) B) and E)

Question 9

Which is not one of the extraembryonic membranes that form early in the development of the embryo?

Accepted Answer

A)  Chorion
B)  Placenta
C)  Amnion
D)  Yolk sac
E)  All of these are correct.F) All of the above
G) C) and D)

Question 10

Which position of the three primary germ layers in the early embryo is correct?

Accepted Answer

A)  Ectoderm on the inside,endoderm on the outside,and mesoderm in the middle
B)  Endoderm on the inside,ectoderm on the outside,and mesoderm in the middle
C)  Mesoderm on the inside,endoderm on the outside,and ectoderm in the middle
D)  Ectoderm on the inside,mesoderm on the outside,and endoderm in the middle
E)  Mesoderm on the inside,ectoderm on the outside,and endoderm in the middleF) C) and D)
G) D) and E)

Question 11

Which is not correct about fertilization?

Accepted Answer

A)  It establishes the three primary germ layers.
B)  It combines male and female genetic material.
C)  It determines the sex of the organism.
D)  It initiates cleavage.
E)  It restores the diploid number of chromosomes.F) C) and D)
G) B) and D)

Question 12

Once implantation takes place the pre-embryo is divided into two general areas.Which of these two actually gives rise to the embryo?

Accepted Answer

A)  Trophoblast
B)  Cytotrophoblast
C)  Syncytiotrophoblast
D)  Embryoblast
E)  MorulaF) A) and E)
G) C) and D)

Question 13

Oogenesis is the formation of

Accepted Answer

A)  a new autosomal cell.
B)  a new somatosomal cell.
C)  a sperm.
D)  an egg.
E)  new ovaries.F) B) and D)
G) A) and B)

Question 14

What structure produces estrogen and progesterone until the placenta is fully formed?

Accepted Answer

A)  Endometrium
B)  Corpus luteum
C)  Pituitary gland
D)  Amnion
E)  Yolk sacF) A) and B)
G) A) and D)

Question 15

This figure shows a cross-sectional view of the developing embryo.Which of the three primary germ layers does number 1 indicate?

Accepted Answer

A)  Ectoderm
B)  Mesoderm
C)  EndodermD) None of the above
E) A) and B)

Question 16

Down syndrome is the result of

Accepted Answer

A)  improper crossing over.
B)  nondisjunction.
C)  improper implantation.
D)  incomplete capacitation.
E)  disassociation.F) A) and B)
G) B) and E)

Question 17

The fetal 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 30 weeks of development.
E)  full term of pregnancy.F) All of the above
G) B) and D)

Question 18

-The process of embryogenesis includes

Accepted Answer

A)  gastrulation.
B)  fertilization.
C)  gametogenesis.
D)  formation of a zygote.E) All of the above
F) A) and B)

Question 19

Neurulation is an example of

Accepted Answer

A)  compaction.
B)  blastulation.
C)  gastrulation.
D)  induction.
E)  organogenesis.F) A) and E)
G) All of the above

Question 20

Which is not a function of the placenta in humans?

Accepted Answer

A)  Exchange of nutrients
B)  Exchange of respiratory gases
C)  Transmission of maternal antibodies
D)  Transfer of blood between mother and embryo
E)  Production of hormonesF) A) and B)
G) D) and E)

Exam 3: Embryology

Which is not correct about fertilization?

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Which is not a function of the placenta in humans?

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Which position of the three primary germ layers in the early embryo is correct?

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From which primary germ layer is the nervous system derived?

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Down syndrome is the result of

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Oogenesis is the formation of

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Formation of the neural tube

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-The process of embryogenesis includes

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Which is not one of the extraembryonic membranes that form early in the development of the embryo?

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Neurulation is an example of

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What is the name given to substances that can cause birth defects or even death if exposure to them occurs during the embryonic period?

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Reduction division occurs during

Correct AnswerverifiedShow Answer

From which primary germ layer are muscles derived?

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-This figure depicts cleavage.What structure does number 3 indicate?

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The fetal period occurs during the

Correct AnswerverifiedShow Answer

From which primary germ layer is the thyroid gland derived?

Correct AnswerverifiedShow Answer

The hormone hCG (human chorionic gonadotropin) is produced by the

Correct AnswerverifiedShow Answer

This figure shows a cross-sectional view of the developing embryo.Which of the three primary germ layers does number 1 indicate?

Correct AnswerverifiedShow Answer

Once implantation takes place the pre-embryo is divided into two general areas.Which of these two actually gives rise to the embryo?

Correct AnswerverifiedShow Answer

What structure produces estrogen and progesterone until the placenta is fully formed?

Correct AnswerverifiedShow Answer

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