Deck 3: Prenatal Development

Question 1

A prenatal diagnostic procedure to detect chromosomal abnormalities is:

A) mitotic cleavage.
B) bilateral symmetry.
C) amniocentesis.
D) folding.

Answer 1

amniocentesis.

Question 2

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

A) 12
B) 18
C) 38
D) 42

Answer 2

38

Question 3

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

A) One
B) Two
C) Three
D) Four

Answer 3

Two

Question 4

The primitive streak forms in the embryonic disc during prenatal development,causing:

A) initiation of palatal development.
B) bilateral symmetry.
C) fusion of the mandibular processes.
D) disintegration of the oropharyngeal membrane.

Question 5

Which of the following statements concerning prenatal development is correct?

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.

Question 6

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

A) First week
B) Second week
C) Third week
D) Fourth week

Question 7

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

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

Question 8

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

A) Placenta
B) Ovum
C) Sperm
D) Yolk sac

Question 9

During prenatal development,the oropharyngeal membrane of the embryo:

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.

Question 10

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

A) Stomodeum
B) First branchial arch
C) Neural folds
D) Frontonasal process

Question 11

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

A) Unattached conceptus
B) Embryonic period
C) Preimplantation period
D) Fetal period

Question 12

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

A) Implantation
B) Mitotic cleavage
C) Meiosis
D) Fertilization

Question 13

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

A) implantation.
B) migration.
C) disintegration.
D) amniocentesis.

Question 14

Which of the following tissues listed will develop from the ectoderm layer of the embryo during prenatal development?

A) Epidermis
B) Liver
C) Muscle
D) Dermis

Question 15

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

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

Question 16

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

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

Question 17

From which embryonic layer is mesoderm derived during prenatal development?

A) Epiblast layer
B) Hypoblast layer
C) Endoderm
D) Neuroectoderm

Question 18

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

A) Heart
B) Spinal cord
C) Face
D) Digestive tract

Question 19

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

A) Neuroectoderm
B) Mesenchyme
C) Somites
D) Endoderm

Question 20

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

A) Second week
B) Third week
C) Fourth week
D) Fifth week

Question 21

Implantation of the zygote may also occur outside the uterus during prenatal development with a(n):

A) infection with rubella.
B) infection with syphilis.
C) ectopic pregnancy.
D) case of ectodermal dysplasia.

Question 22

What is the exact term for the process that affords the development of specific tissue structure or differing form due to embryonic cell migration and inductive interactions?

A) Folding
B) Morphogenesis
C) Proliferation
D) Appositional or interstitial growth

Question 23

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

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

Question 24

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

A) Placenta
B) Amniotic cavity
C) Yolk sac
D) Primitive streak

Question 25

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?

A) Somites
B) Neural crest cells
C) Mesoderm
D) Yolk sac