Question 1

From which primary germ layer is the epidermis of the skin derived?

Accepted Answer

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

Question 2

The formation of sex cells in the human is termed

Accepted Answer

A)  gametogenesis.
B)  karyogenesis.
C)  sporogenesis.
D)  typogenesis.
E)  differentiation.F) All of the above
G) A) and B)

Question 3

The correct chronological pathway of fertilization is

Accepted Answer

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

Question 4

What is capacitation?

Accepted Answer

A)  Another term for fertilization
B)  Implantation of the embryo into the uterine wall
C)  Movement of the fertilized egg down the fallopian tube
D)  Release of the secondary oocyte from the ovary
E)  Conditioning of the sperm within the female reproductive tractF) A) and B)
G) A) and C)

Question 5

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

Question 6

The function of the chorion is to

Accepted Answer

A)  prevent desiccation of the embryo.
B)  assist in the formation of the circulatory system.
C)  form red blood cells.
D)  aid in the formation of the placenta.
E)  cover the embryo in a protective layer of mucus.F) B) and C)
G) C) and D)

Question 7

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

Accepted Answer

A)  chorion.
B)  cytotrophoblast.
C)  endometrium.
D)  corpus luteum.
E)  syncytiotrophoblast.F) A) and D)
G) None of the above

Question 8

From which primary germ layer is the dermis of the skin derived?

Accepted Answer

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

Question 9

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

Question 10

Down syndrome is the result of

Accepted Answer

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

Question 11

The two items that form protective layers around the secondary oocyte are the zona pellucida and

Accepted Answer

A)  polar body.
B)  transverse membrane.
C)   corona radiata.
D)  acrosome.
E)  primary oocyte.F) A) and C)
G) B) and E)

Question 12

During this fetal stage,lanugo covers the skin and the limbs near their final proportions.

Accepted Answer

A)  Weeks 1-8
B)  Weeks 9-12
C)  Weeks 13-16
D)  Weeks 17-20
E)  Weeks 21-38F) None of the above
G) A) and C)

Question 13

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) B) and C)

Question 14

Some estimates claim that approximately ______ percent of all pregnancies result in spontaneous abortion,many due to chromosomal abnormalities.

Accepted Answer

A)  10
B)  20
C)  30
D)  40
E)  50F) A) and D)
G) B) and C)

Question 15

The number of chromosomes in a secondary oocyte is

Accepted Answer

A)  greater than the number in a mature sperm.
B)  less than the number in a mature sperm.
C)  the same as the number in a mature sperm.
D)  greater than the number in a polar body.
E)  less than the number in a polar body.F) A) and B)
G) B) and C)

Question 16

The number of possible combinations of genes in humans is virtually limitless.One reason is random assortment of chromosomes and the other is

Accepted Answer

A)  random mating.
B)  crossing over.
C)  reduction division.
D)  nondisjunction.
E)  spermiogenesis.F) None of the above
G) B) and E)

Question 17

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

Question 18

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) None of the above

Question 19

The event called "crossing over" in meiosis results in

Accepted Answer

A)  greater genetic variety in sex cells and thus in embryos.
B)  less genetic variety in sex cells.
C)  greater vitality of sex cells making them more active.
D)  a change in the gender (sex) of the embryo.
E)  irreversible mutations.F) C) and D)
G) A) and B)

Question 20

Which is not correct concerning cephalocaudal folding of the embryonic disc?

Accepted Answer

A)  It occurs before the primary germ layers have formed.
B)  It occurs in the cephalic and caudal regions of the embryo.
C)  It occurs because of differential growth in different regions of the embryonic disc.
D)  It occurs during the late third and fourth weeks of development.
E)  It helps create the future head and buttocks regions of the embryo.F) A) and B)
G) C) and D)

Exam 3: Embryology

What is capacitation?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A polar body is formed during

Correct AnswerverifiedShow Answer

The correct chronological pathway of fertilization is

Correct AnswerverifiedShow Answer

What happens during gastrulation?

Correct AnswerverifiedShow Answer

Which is not correct concerning cephalocaudal folding of the embryonic disc?

Correct AnswerverifiedShow Answer

The number of chromosomes in a secondary oocyte is

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

From which primary germ layer is the epidermis of the skin derived?

Correct AnswerverifiedShow Answer

The two items that form protective layers around the secondary oocyte are the zona pellucida and

Correct AnswerverifiedShow Answer

From which primary germ layer is the dermis of the skin derived?

Correct AnswerverifiedShow Answer

The formation of sex cells in the human is termed

Correct AnswerverifiedShow Answer

Down syndrome is the result of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The event called "crossing over" in meiosis results in

Correct AnswerverifiedShow Answer

The number of possible combinations of genes in humans is virtually limitless.One reason is random assortment of chromosomes and the other is

Correct AnswerverifiedShow Answer

Some estimates claim that approximately ______ percent of all pregnancies result in spontaneous abortion,many due to chromosomal abnormalities.

Correct AnswerverifiedShow Answer

During this fetal stage,lanugo covers the skin and the limbs near their final proportions.

Correct AnswerverifiedShow Answer

The function of the chorion is to

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified