Question 1

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 E)
G) D) and E)

Question 2

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

Question 3

From which primary germ layer is the thyroid gland derived?

Accepted Answer

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

Question 4

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 C)
G) A) and E)

Question 5

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

Question 6

Neurulation is an example of

Accepted Answer

A)  compaction.
B)  blastulation.
C)  gastrulation.
D)  induction.
E)  organogenesis.F) A) and E)
G) A) and B)

Question 7

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) B) and E)
G) C) and D)

Question 8

-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 B)
G) A) and C)

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) A) and D)
G) A) and B)

Question 10

From which primary germ layer are muscles derived?

Accepted Answer

A)  Ectoderm
B)  Mesoderm
C)  EndodermD) B) and C)
E) All of the above

Question 11

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 B)
G) C) and E)

Question 12

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) All of the above

Question 13

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) B) and E)
G) None of the above

Question 14

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) B) and C)
G) C) and D)

Question 15

From which primary germ layer is the nervous system derived?

Accepted Answer

A)  Ectoderm
B)  Mesoderm
C)  EndodermD) All of the above
E) B) and C)

Question 16

-The process of embryogenesis includes

Accepted Answer

A)  gastrulation.
B)  fertilization.
C)  gametogenesis.
D)  formation of a zygote.E) None of the above
F) B) and D)

Question 17

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) None of the above
G) D) and E)

Question 18

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) All of the above
G) A) and E)

Question 19

Reduction division occurs during

Accepted Answer

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

Question 20

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 C)

Exam 3: Embryology

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

Correct AnswerverifiedShow Answer

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

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

Which is not a function of the placenta in humans?

Correct AnswerverifiedShow Answer

Reduction division occurs during

Correct AnswerverifiedShow Answer

Down syndrome is the result of

Correct AnswerverifiedShow Answer

Which is not correct about fertilization?

Correct AnswerverifiedShow Answer

Formation of the neural tube

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

-The process of embryogenesis includes

Correct AnswerverifiedShow Answer

From which primary germ layer is the nervous system derived?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

From which primary germ layer are muscles derived?

Correct AnswerverifiedShow Answer

Neurulation is an example of

Correct AnswerverifiedShow Answer

Oogenesis is the formation of

Correct AnswerverifiedShow Answer

The fetal period occurs during the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

From which primary germ layer is the thyroid gland derived?

Correct AnswerverifiedShow Answer

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