Question 1

What is the prenatal organ that joins the pregnant woman and the developing embryo during the second week of prenatal development?

Accepted Answer

A)   Placenta
B)   Amniotic cavity
C)   Yolk sac
D)   Primitive streakE) None of the above
F) All of the above

Question 2

Which of the following statements concerning prenatal development is correct?

Accepted Answer

A)   Most congenital malformations occur during the last prenatal week.
B)   Maturation of existing structures occurs during the second to eighth week.
C)   Initiation of embryonic layers occurs during the first week.
D)   The fetus is the structure present during the embryonic period.E) A) and C)
F) A) and B) C

Question 3

How many X-type chromosomes are necessary for the embryo to become of the female gender when present during prenatal development?

Accepted Answer

A)   One
B)   Two
C)   Three
D)   FourE) A) and C)
F) None of the above

Question 4

Which period of prenatal development is characterized by increased cellular differentiation?

Accepted Answer

A)   Unattached conceptus
B)   Embryonic period
C)   Preimplantation period
D)   Fetal periodE) A) and B)
F) A) and C)

Question 5

During prenatal development,the oropharyngeal membrane of the embryo:

Accepted Answer

A)   consists of three embryonic layers.
B)   is located superior to the first branchial arch.
C)   disintegrates during the third week of prenatal development.
D)   is located superior to the maxillary process.E) A) and B)
F) All of the above

Question 6

How many pairs of somites form the cuboidal segments of mesoderm within the embryo during the third week of prenatal development?

Accepted Answer

A)   12
B)   18
C)   38
D)   42E) B) and C)
F) All of the above

Question 7

By the end of the first week of prenatal development,the blastula stops traveling and undergoes:

Accepted Answer

A)   implantation.
B)   migration.
C)   disintegration.
D)   amniocentesis.E) C) and D)
F) B) and D) A

Question 8

The folding of the embryo during prenatal development causes _____ to be on the _____.

Accepted Answer

A)   endoderm; inside of the embryo
B)   ectoderm; inside of endoderm
C)   endoderm; outside of the mesoderm
D)   mesoderm; outside of the ectodermE) B) and D)
F) B) and C)

Question 9

The neural crest cells migrate from which embryonic structures during prenatal development?

Accepted Answer

A)   Stomodeum
B)   First branchial arch
C)   Neural folds
D)   Frontonasal processE) B) and D)
F) A) and C)

Question 10

What exact cells are localized to the neural plate of the embryo during the third week of prenatal development?

Accepted Answer

A)   Neuroectoderm
B)   Mesenchyme
C)   Somites
D)   EndodermE) A) and C)
F) C) and D)

Question 11

If there is failure of migration of the neural crest cells to the facial region during prenatal development,_____ can develop in the embryo.

Accepted Answer

A)   ectodermal dysplasia
B)   fetal alcohol syndrome
C)   Down syndrome
D)   Treacher Collins syndromeE) C) and D)
F) B) and D)

Question 12

In which of the following do the final stages of meiosis occur during prenatal development?

Accepted Answer

A)   Placenta
B)   Ovum
C)   Sperm
D)   Yolk sacE) A) and B)
F) A) and C)

Question 13

Which of the following can occur that mainly involves the abnormal development of one or more structures from ectoderm within the embryonic period?

Accepted Answer

A)   Treacher Collins syndrome
B)   Ectodermal dysplasia
C)   Congenital syphilis
D)   Fetal alcohol syndromeE) C) and D)
F) A) and B) B

Question 14

What exact cells or structures develop from neuroectoderm and migrate from the neural folds to then join mesoderm to form mesenchyme during the third week of prenatal development?

Accepted Answer

A)   Somites
B)   Neural crest cells
C)   Mesoderm
D)   Yolk sacE) All of the above
F) None of the above

Question 15

Found in early prenatal development,the neural tube will form in the future which of the following structures?

Accepted Answer

A)   Heart
B)   Spinal cord
C)   Face
D)   Digestive tractE) None of the above
F) All of the above

Question 16

During which week of prenatal development does the neural plate differentiate?

Accepted Answer

A)   Second week
B)   Third week
C)   Fourth week
D)   Fifth weekE) A) and B)
F) B) and C)

Question 17

When does the blastocyte stop traveling and undergo implantation during prenatal development?

Accepted Answer

A)   First week
B)   Second week
C)   Third week
D)   Fourth weekE) B) and C)
F) A) and C)

Question 18

From which embryonic layer is mesoderm derived during prenatal development?

Accepted Answer

A)   Epiblast layer
B)   Hypoblast layer
C)   Endoderm
D)   NeuroectodermE) A) and B)
F) None of the above

Question 19

What best characterizes the first week of prenatal development so that the blastocyst splits into smaller and more numerous cells?

Accepted Answer

A)   Implantation
B)   Mitotic cleavage
C)   Meiosis
D)   FertilizationE) B) and C)
F) A) and D)

Question 20

Which of the following structures initially forms during the third week of prenatal development?

Accepted Answer

A)   Primitive streak
B)   Embryoblast layer
C)   Bilaminar embryonic disc
D)   Trophoblast layerE) A) and B)
F) B) and C)

Exam 3: Prenatal Development

What is the prenatal organ that joins the pregnant woman and the developing embryo during the second week of prenatal development?

Correct AnswerverifiedShow Answer

Which of the following statements concerning prenatal development is correct?

Correct AnswerverifiedC

How many X-type chromosomes are necessary for the embryo to become of the female gender when present during prenatal development?

Correct AnswerverifiedShow Answer

Which period of prenatal development is characterized by increased cellular differentiation?

Correct AnswerverifiedShow Answer

During prenatal development,the oropharyngeal membrane of the embryo:

Correct AnswerverifiedShow Answer

How many pairs of somites form the cuboidal segments of mesoderm within the embryo during the third week of prenatal development?

Correct AnswerverifiedShow Answer

By the end of the first week of prenatal development,the blastula stops traveling and undergoes:

Correct AnswerverifiedA

The folding of the embryo during prenatal development causes _____ to be on the _____.

Correct AnswerverifiedShow Answer

The neural crest cells migrate from which embryonic structures during prenatal development?

Correct AnswerverifiedShow Answer

What exact cells are localized to the neural plate of the embryo during the third week of prenatal development?

Correct AnswerverifiedShow Answer

If there is failure of migration of the neural crest cells to the facial region during prenatal development,_____ can develop in the embryo.

Correct AnswerverifiedShow Answer

In which of the following do the final stages of meiosis occur during prenatal development?

Correct AnswerverifiedShow Answer

Which of the following can occur that mainly involves the abnormal development of one or more structures from ectoderm within the embryonic period?

Correct AnswerverifiedB

What exact cells or structures develop from neuroectoderm and migrate from the neural folds to then join mesoderm to form mesenchyme during the third week of prenatal development?

Correct AnswerverifiedShow Answer

Found in early prenatal development,the neural tube will form in the future which of the following structures?

Correct AnswerverifiedShow Answer

During which week of prenatal development does the neural plate differentiate?

Correct AnswerverifiedShow Answer

When does the blastocyte stop traveling and undergo implantation during prenatal development?

Correct AnswerverifiedShow Answer

From which embryonic layer is mesoderm derived during prenatal development?

Correct AnswerverifiedShow Answer

What best characterizes the first week of prenatal development so that the blastocyst splits into smaller and more numerous cells?

Correct AnswerverifiedShow Answer

Which of the following structures initially forms during the third week of prenatal development?

Correct AnswerverifiedShow Answer

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C

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A

The folding of the embryo during prenatal development causes _ to be on the _.

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B

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