Question 1

Figure 51-4 .  Refer to the accompanying figure. Which structure gives rise to the spinal cord?

Accepted Answer

A)   1
B)   2
C)   5
D)   8
E)   9F) B) and E)
G) A) and E)

Question 2

Which of the following occurs during gastrulation?

Accepted Answer

A)   formation of the gray crescent region
B)   formation of ectoderm, mesoderm, and endoderm
C)   closure of the archenteron
D)   formation of the blastocoel
E)   radial cleavage takes placeF) A) and E)
G) None of the above

Question 3

The first breath of the neonate is initiated by the:

Accepted Answer

A)   passage through the birth canal.
B)   removal of amniotic fluid from its mouth.
C)   accumulation of carbon dioxide in the blood.
D)   detection of light by its visual receptors.
E)   increase in oxygen concentration in the lungs.F) A) and C)
G) A) and B)

Question 4

Match between columns
                        Premises: in humans, the embryo implants in the uterus when in this stage
contains an archenteron
produced by the process of invagination
the formation of a blastopore begins this stage
the neural tube forms during this stage
the first stage of embryonic development
a hollow ball of cells with a fluid filled cavity
the formation of a primitive groove begins this stage
a solid ball of blastomeres
in mammals, this is called a blastocyst
many instances of induction occur during this stage
the neural crest arises during this stage
a three-layered embryo
the first stage to contain a blastocoel

Accepted Answer

The Answer of blastula and stage of organogenesis and gastrula is...

Question 5

Inside the zona pellucida is a layer of granulosa cells.

Accepted Answer

A) True 
 B)False

Question 6

Figure 51-4 .  Refer to the accompanying figure. Which structure is from a different germ layer than the rest?

Accepted Answer

A)   2
B)   3
C)   6
D)   7
E)   8F) A) and B)
G) A) and C)

Question 7

What is cellular aging and what causes its occurrence?

Accepted Answer

Concepts to Consider: In cellular aging,...

Question 8

The gray crescent region of the amphibian zygote is thought to contain:

Accepted Answer

A)   growth factors and developmental determinants.
B)   hormones and ribosomes.
C)   yolk and dark pigment granules.
D)   mitochondria and ribosomes.
E)   neurotransmitters and hormones.F) C) and E)
G) A) and E)

Question 9

The function of the chorion is to:

Accepted Answer

A)   absorb shock.
B)   form blood cells.
C)   provide nourishment.
D)   permit freedom of movement.
E)   permit gas exchange.F) A) and C)
G) B) and D)

Question 10

Dizygotic twins are also called fraternal twins.

Accepted Answer

A) True 
 B)False

Question 11

Which statement about a blastodisc is FALSE?

Accepted Answer

A)   It can be further divided into an upper epiblast and below that, the hypoblast.
B)   It results from meroblastic cleavage.
C)   It is found in isolecithal eggs.
D)   It is a small disc of cytoplasm at the animal pole.
E)   It is characteristic of cell division in bird eggs.F) B) and C)
G) A) and E)

Question 12

The eggs of birds and reptiles are telolecithal .

Accepted Answer

A) True 
 B)False

Question 13

Following cleavage of the zygote, which of the following is the first to occur?

Accepted Answer

A)   blastula
B)   gastrula
C)   neural crest
D)   morula
E)   primitive streakF) A) and B)
G) A) and C)

Question 14

Figure 51-1  What type of cleavage pattern is represented in the accompanying figure?

Accepted Answer

A)   holoblastic and radial
B)   holoblastic and spiral
C)   meroblastic and radial
D)   meroblastic and spiral
E)   holoblastic and mosaicF) A) and E)
G) C) and D)

Question 15

The trophoblast secretes ____, which signals the corpus luteum that pregnancy has begun.

Accepted Answer

A)   estrogen
B)   a gray crescent
C)   progesterone
D)   hCG
E)   an enzymeF) B) and D)
G) C) and D)

Question 16

During an acrosome reaction, the acrosome:

Accepted Answer

A)   detaches, allowing the sperm to penetrate the egg.
B)   releases enzymes that digest the outer layer of the egg.
C)   secretes calcium ions, which cause the sperm to fuse with the egg.
D)   releases bindin, which causes the sperm to bind to the egg.
E)   secretes a chemical that attracts the egg to the sperm.F) A) and E)
G) A) and B)

Question 17

Relate nuclear equivalence and differential gene expression.

Accepted Answer

In nuclear equivalence no genetic change...

Question 18

Which of the following are incorrectly paired?

Accepted Answer

A)   heroin − premature births and low birth weight
B)   thalidomide − babies born without toes
C)   accutane − associated with malformations of the brain
D)   cocaine − constricts fetal arteries, which leads to retarded development
E)   cigarette smoking − an addiction to nicotineF) C) and E)
G) D) and E)

Question 19

A human embryo is capable of movement and has gonads that are distinguishable as either testes or ovaries by the end of the:

Accepted Answer

A)   second week.
B)   fourth week.
C)   sixth week.
D)   eighth week.
E)   first trimester.F) A) and D)
G) All of the above

Question 20

Figure 51-3  Refer to the accompanying figure. The chorion is identified by number:

Accepted Answer

A)   1.
B)   2.
C)   3.
D)   4.
E)   5.F) B) and D)
G) A) and B)

Exam 51: Animal Development

The gray crescent region of the amphibian zygote is thought to contain:

Correct Answer
verified

Match the stage of embryonic development with its description.

During an acrosome reaction, the acrosome:

Correct Answer
verified

The eggs of birds and reptiles are telolecithal .

Correct Answer
verified

A human embryo is capable of movement and has gonads that are distinguishable as either testes or ovaries by the end of the:

Correct Answer
verified

What is cellular aging and what causes its occurrence?

Correct Answer
verified
Concepts to Consider: In cellular aging,...
View Answer

Which of the following are incorrectly paired?

Correct Answer
verified

Which statement about a blastodisc is FALSE?

Correct Answer
verified

Relate nuclear equivalence and differential gene expression.

Correct Answer
verified
In nuclear equivalence no genetic change...
View Answer

Figure 51-4 . Refer to the accompanying figure. Which structure is from a different germ layer than the rest?

Correct Answer
verified

Dizygotic twins are also called fraternal twins.

Correct Answer
verified

Figure 51-1 What type of cleavage pattern is represented in the accompanying figure?

Correct Answer
verified

Following cleavage of the zygote, which of the following is the first to occur?

Correct Answer
verified

Inside the zona pellucida is a layer of granulosa cells.

Correct Answer
verified

Which of the following occurs during gastrulation?

Correct Answer
verified

The function of the chorion is to:

Correct Answer
verified

The first breath of the neonate is initiated by the:

Correct Answer
verified

Figure 51-4 . Refer to the accompanying figure. Which structure gives rise to the spinal cord?

Correct Answer
verified

Figure 51-3 Refer to the accompanying figure. The chorion is identified by number:

Correct Answer
verified

The trophoblast secretes ____, which signals the corpus luteum that pregnancy has begun.

Correct Answer
verified

Exam 51: Animal Development

The gray crescent region of the amphibian zygote is thought to contain:

Correct AnswerverifiedShow Answer

Match the stage of embryonic development with its description.

During an acrosome reaction, the acrosome:

Correct AnswerverifiedShow Answer

The eggs of birds and reptiles are telolecithal .

Correct AnswerverifiedShow Answer

A human embryo is capable of movement and has gonads that are distinguishable as either testes or ovaries by the end of the:

Correct AnswerverifiedShow Answer

What is cellular aging and what causes its occurrence?

Correct AnswerverifiedConcepts to Consider: In cellular aging,...View AnswerShow Answer

Which of the following are incorrectly paired?

Correct AnswerverifiedShow Answer

Which statement about a blastodisc is FALSE?

Correct AnswerverifiedShow Answer

Relate nuclear equivalence and differential gene expression.

Correct AnswerverifiedIn nuclear equivalence no genetic change...View AnswerShow Answer

Figure 51-4 . Refer to the accompanying figure. Which structure is from a different germ layer than the rest?

Correct AnswerverifiedShow Answer

Dizygotic twins are also called fraternal twins.

Correct AnswerverifiedShow Answer

Figure 51-1 What type of cleavage pattern is represented in the accompanying figure?

Correct AnswerverifiedShow Answer

Following cleavage of the zygote, which of the following is the first to occur?

Correct AnswerverifiedShow Answer

Inside the zona pellucida is a layer of granulosa cells.

Correct AnswerverifiedShow Answer

Which of the following occurs during gastrulation?

Correct AnswerverifiedShow Answer

The function of the chorion is to:

Correct AnswerverifiedShow Answer

The first breath of the neonate is initiated by the:

Correct AnswerverifiedShow Answer

Figure 51-4 . Refer to the accompanying figure. Which structure gives rise to the spinal cord?

Correct AnswerverifiedShow Answer

Figure 51-3 Refer to the accompanying figure. The chorion is identified by number:

Correct AnswerverifiedShow Answer

The trophoblast secretes ____, which signals the corpus luteum that pregnancy has begun.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
Concepts to Consider: In cellular aging,...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
In nuclear equivalence no genetic change...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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