Question 1

When does the embryonic period officially begin?

Accepted Answer

A)  With the onset of cleavage
B)  At the time of implantation
C)  With the establishment of the three primary germ layers
D)  When the umbilical cord becomes functional
E)  At fertilizationF) B) and C)
G) A) and E)

Question 2

-This figure shows the transit of the pre-embryo through the uterine tube.What developmental stage implants in the uterine wall?

Accepted Answer

A)  Gastrula
B)  Morula
C)  Secondary oocyte
D)  Blastocyst
E)  ZygoteF) A) and B)
G) D) and E)

Question 3

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 radiate.
D)  acrosome.
E)  primary oocyte.F) A) and C)
G) All of the above

Question 4

It takes about _______ for the placenta to become fully formed.

Accepted Answer

A)  1 week
B)  2 weeks
C)  1 month
D)  2 months
E)  3 monthsF) All of the above
G) C) and E)

Question 5

In the human,the diploid genetic condition occurs

Accepted Answer

A)  when the number of chromosomes equals the number of genes.
B)  when a cell has 23 pairs of chromosomes.
C)  when a cell has the (n) number of chromosomes.
D)  when a cell has 23 chromosomes.
E)  in each gamete just before fertilization.F) A) and E)
G) C) and D)

Question 6

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

Question 7

-This figure shows the transit of the pre-embryo through the uterine tube.What event does number 1 indicate?

Accepted Answer

A)  Fertilization
B)  Implantation
C)  Cleavage
D)  Gastrulation
E)  OvulationF) C) and E)
G) B) and E)

Question 8

Why does meiosis pass through two complete cycles?

Accepted Answer

A)  To assure that the gametes will be of the correct size
B)  To allow crossing over to occur
C)  So that the zygote will have the diploid number of chromosomes
D)  Because two cycles are necessary to produce the proper shape of the gametes
E)  Because the chromosomes are still double-stranded at the end of meiosis IF) None of the above
G) C) and E)

Question 9

The formation of sex cells in the human is termed

Accepted Answer

A)  gametogenesis.
B)  karyogenesis.
C)  sporogenesis.
D)  typogenesis.
E)  differentiation.F) None of the above
G) A) and B)

Question 10

A double-stranded chromosome consists of two genetically identical sister chromatids.What important biological event produced the sister chromatids?

Accepted Answer

A)  Crossing over
B)  Genetic mutation
C)  Mitosis
D)  Replication
E)  Reduction divisionF) B) and C)
G) A) and D)

Question 11

Spermiogenesis is

Accepted Answer

A)  the formation of a spermatid.
B)  the transformation of a spermatid into a functional sperm.
C)  the process of a sperm finding an oocyte.
D)  reduction division of a spermatogonium.
E)  the process of a sperm losing its tail following fertilization.F) A) and C)
G) C) and D) B

Question 12

From which primary germ layer is the heart derived?

Accepted Answer

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

Question 13

The fetal period

Accepted Answer

A)  extends from the beginning of the 9th week until birth.
B)  extends from the beginning of the 12th week until birth.
C)  includes only the middle trimester.
D)  includes only the last trimester.
E)  extends from the end of the 4th week until birth.F) C) and D)
G) A) and E)

Question 14

The human sex cells are called

Accepted Answer

A)  spores.
B)  germ plasm.
C)  genes.
D)  gonads.
E)  gametes.F) C) and D)
G) A) and B)

Question 15

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

Question 16

The acrosome

Accepted Answer

A)  carries the DNA.
B)  is responsible for movement of a spermatozoan.
C)  provides nourishment to the sperm.
D)  contains enzymes to break through protective layers surrounding the secondary oocyte.
E)  initiates growth of the sperm tail.F) B) and D)
G) B) and C)

Question 17

The process of separating homologous chromosomes is termed

Accepted Answer

A)  replication.
B)  reduction division.
C)  nondisjunction.
D)  cleavage.
E)  differentiation.F) All of the above
G) B) and C)

Question 18

-This figure shows the transit of the pre-embryo through the uterine tube.What event does number 2 indicate?

Accepted Answer

A)  Fertilization
B)  Implantation
C)  Cleavage
D)  Gastrulation
E)  OvulationF) C) and E)
G) None of the above

Question 19

-This figure depicts cleavage.Number 2 indicates a pre-embryo in the _________ stage of development.

Accepted Answer

A)  2-cell
B)  4-cell
C)  8-cell
D)  morula
E)  blastocystF) A) and D)
G) B) and D)

Question 20

During this critical period the subcutaneous fat is deposited and testes descend into the scrotum.

Accepted Answer

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

Exam 3: Embryology

When does the embryonic period officially begin?

Correct AnswerverifiedShow Answer

-This figure shows the transit of the pre-embryo through the uterine tube.What developmental stage implants in the uterine wall?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

It takes about _______ for the placenta to become fully formed.

Correct AnswerverifiedShow Answer

In the human,the diploid genetic condition occurs

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

-This figure shows the transit of the pre-embryo through the uterine tube.What event does number 1 indicate?

Correct AnswerverifiedShow Answer

Why does meiosis pass through two complete cycles?

Correct AnswerverifiedShow Answer

The formation of sex cells in the human is termed

Correct AnswerverifiedShow Answer

A double-stranded chromosome consists of two genetically identical sister chromatids.What important biological event produced the sister chromatids?

Correct AnswerverifiedShow Answer

Spermiogenesis is

Correct AnswerverifiedB

From which primary germ layer is the heart derived?

Correct AnswerverifiedB

The fetal period

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The human sex cells are called

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What is capacitation?

Correct AnswerverifiedE

The acrosome

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The process of separating homologous chromosomes is termed

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-This figure shows the transit of the pre-embryo through the uterine tube.What event does number 2 indicate?

Correct AnswerverifiedShow Answer

-This figure depicts cleavage.Number 2 indicates a pre-embryo in the _________ stage of development.

Correct AnswerverifiedShow Answer

During this critical period the subcutaneous fat is deposited and testes descend into the scrotum.

Correct AnswerverifiedShow Answer

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B

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B

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E

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