Question 1

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

Question 2

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

Question 3

From which primary germ layer are muscles derived?

Accepted Answer

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

Question 4

The blastodisc (bilaminar germinal disc) of the early embryo consists of the

Accepted Answer

A)  hypoblast and the epiblast.
B)  hypoblast and the trophoblast.
C)  epiblast and the trophoblast.
D)  hypoblast and the cytotrophoblast.
E)  cytotrophoblast and the epiblast.F) B) and C)
G) A) and E)

Question 5

The axial skeleton,most muscle,cartilage,dermis,and connective tissues are derived from blocklike embryonic structures called

Accepted Answer

A)  teratogens.
B)  dermatomes.
C)  notochords.
D)  lateral plates.
E)  somites.F) B) and E)
G) A) and C)

Question 6

What is the feature that first signals gastrulation?

Accepted Answer

A)  Invagination of cells from the epiblast occurs.
B)  Folding of the embryonic disc occurs.
C)  The yolk sac disappears.
D)  The embryonic disc forms.
E)  The primitive streak forms.F) C) and D)
G) B) and D) E

Question 7

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

Question 8

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

Question 9

What would be the result if the notochord failed to develop?

Accepted Answer

A)  The digestive system could not develop properly.
B)  The circulatory system could not develop properly.
C)  The skeletal system could not develop properly.
D)  The nervous system could not develop properly.
E)  The reproductive system could not develop properly.F) C) and E)
G) A) and E)

Question 10

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) B) and D)

Question 11

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 E)
G) A) and D)

Question 12

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 E)
G) A) and D)

Question 13

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

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

Question 15

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 16

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 haploid nucleus.E) A) and B)
F) B) and D)

Question 17

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

Question 18

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

Question 19

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

Accepted Answer

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

Question 20

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) All of the above A

Exam 3: Embryology

Why does meiosis pass through two complete cycles?

Correct AnswerverifiedShow Answer

The fetal period occurs during the

Correct AnswerverifiedShow Answer

From which primary germ layer are muscles derived?

Correct AnswerverifiedShow Answer

The blastodisc (bilaminar germinal disc) of the early embryo consists of the

Correct AnswerverifiedShow Answer

The axial skeleton,most muscle,cartilage,dermis,and connective tissues are derived from blocklike embryonic structures called

Correct AnswerverifiedShow Answer

What is the feature that first signals gastrulation?

Correct AnswerverifiedE

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What would be the result if the notochord failed to develop?

Correct AnswerverifiedShow Answer

The fetal period

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Spermiogenesis is

Correct AnswerverifiedShow Answer

The embryonic period occurs during the

Correct AnswerverifiedShow Answer

Which is not a function of the placenta in humans?

Correct AnswerverifiedD

From which primary germ layer is the gall bladder derived?

Correct AnswerverifiedShow Answer

Which statement is not correct concerning fertilization?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is not correct about fertilization?

Correct AnswerverifiedA

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E

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D

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A