Question 1

The response to sperm fusing with the egg membrane causes enzyme-rich granules to ultimately cause the separation of the vitelline envelope and the egg membrane; this is called

Accepted Answer

A)   polyspermy.
B)   pronucleation.
C)   the cortical reaction.
D)   cytoplasmic localization.E) B) and C)
F) A) and D)

Question 2

A primitive streak appears during gastrulation of

Accepted Answer

A)   sea stars and humans.
B)   birds and reptiles.
C)   nemerteans.
D)   only mammals.E) B) and D)
F) A) and D)

Question 3

The internal pouch representing the developing gut in a gastrula is called a _______

Accepted Answer

A)   blastocoels.
B)   pseudocoelom.
C)   coelom.
D)   archenteron.E) B) and D)
F) B) and C)

Question 4

The concept that an egg contains the building material that must somehow be assembled is called

Accepted Answer

A)   induction.
B)   pronuclei.
C)   preformation.
D)   epigenesis.E) B) and C)
F) A) and D)

Question 5

In the human,which part of the blastocyst will develop into the embryo proper (versus the supporting placenta) ?

Accepted Answer

A)   Archenteron
B)   Blastopore
C)   Trophoblast
D)   Inner cell massE) A) and B)
F) A) and C)

Question 6

In nearly all metazoa,"germ layers" is a term that describes

Accepted Answer

A)   the germ cells.
B)   foreign cells that enter the embryonic process.
C)   mesoderm, ectoderm and endoderm.
D)   the germ line, in contrast to the somatic or body cells.E) C) and D)
F) B) and C)

Question 7

Which of the following is NOT characteristic of regulative development in animals?

Accepted Answer

A)   is a type in which the fate of a blastomere is heavily determined by its neighbor cells.
B)   occurs in most (but not all)  deuterostomes.
C)   is a type in which removing a blastomere causes the remaining blastomeres to "fill in" for the lost cell.
D)   usually occurs in protostomes.E) A) and C)
F) B) and C)

Question 8

The product of cleavage in a zygote produces a cluster of small cells called

Accepted Answer

A)   pronuclei.
B)   blastomeres.
C)   polar bodies.
D)   meroblasts.E) All of the above
F) B) and D)

Question 9

The sac that surrounds the fetus and usually ruptures just before childbirth is the

Accepted Answer

A)   amnion.
B)   placenta.
C)   chorion.
D)   yolk sac.
E)   allantois.F) B) and E)
G) A) and E)

Question 10

The major group of the animal kingdom that includes animals that in their development show spiral cleavage and mosaic development is the __________.

Accepted Answer

The answer of The major group of the animal kingdom...

Question 11

Entrance of more than one sperm

Accepted Answer

A)   is called polyspermy and is disastrous for animal zygotes.
B)   results in epigenesis.
C)   is neutralized by fusion with polar bodies.
D)   results in formation of a large pronucleus.
E)   initiates cleavage.F) C) and E)
G) B) and D)

Question 12

An enterocoelous animal has

Accepted Answer

A)   a true coelom.
B)   a pseudocoelom.
C)   no coelom.
D)   a schizocoelom.E) A) and B)
F) A) and C)

Question 13

In animals,indirect development

Accepted Answer

A)   occurs only in mammals.
B)   lacks a larval stage.
C)   involves a larval stage.
D)   occurs only when eggs develop without being fertilized.E) B) and C)
F) None of the above

Question 14

Mosaic development in animals

Accepted Answer

A)   is a type in which each of the fate of a blastomere is heavily determined by its neighbor cells.
B)   is synonymous with regulative development.
C)   is a type in which each of the early blastomeres lacks the potential of developing into a complete organism and removing a blastomere eliminates a future body part.
D)   None of the choices are correctE) A) and B)
F) B) and D)

Question 15

The cortical reaction that follows fertilization causes a hardening of the vitelline envelope to produce the _________ _________.

Accepted Answer

fertilizat...

Question 16

Somites,which form segmental muscles and vertebrae,develop from which germ layer?

Accepted Answer

A)   Ectoderm
B)   Endoderm
C)   Mesoderm
D)   MyodermE) B) and C)
F) None of the above

Question 17

The conclusion of Spemann's work,in which he tied off a zygote isolating the nucleus on one side and only cytoplasm on the other,helped prove

Accepted Answer

A)   origin of the coelom.
B)   nuclear equivalency.
C)   cytoplasmic specification.
D)   Embryonic inductionE) A) and B)
F) A) and C)

Question 18

Neighboring cells influence the development of each other,either by direct contact or by production of chemical signals,in

Accepted Answer

A)   neurulation.
B)   induction.
C)   maternal determinants.
D)   homeotic pattern formation.E) None of the above
F) B) and D)

Question 19

The special blastomere labeled the 4-d cell often gives rise to the

Accepted Answer

A)   endoderm of many protostomes.
B)   endoderm of many deuterostomes.
C)   mesoderm of many protostomes.
D)   mesoderm of many deuterostomes.
E)   ectoderm of many protostomes.F) A) and C)
G) C) and D)

Question 20

Rotational cleavage is unique to

Accepted Answer

A)   amphibians.
B)   mammals.
C)   sea stars.
D)   lophotrochozoa.E) None of the above
F) A) and B)

Exam 8: Principles of Development

A primitive streak appears during gastrulation of

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Mosaic development in animals

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The response to sperm fusing with the egg membrane causes enzyme-rich granules to ultimately cause the separation of the vitelline envelope and the egg membrane; this is called

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The internal pouch representing the developing gut in a gastrula is called a _______

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In animals,indirect development

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The product of cleavage in a zygote produces a cluster of small cells called

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The special blastomere labeled the 4-d cell often gives rise to the

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The sac that surrounds the fetus and usually ruptures just before childbirth is the

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Entrance of more than one sperm

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Which of the following is NOT characteristic of regulative development in animals?

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An enterocoelous animal has

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The conclusion of Spemann's work,in which he tied off a zygote isolating the nucleus on one side and only cytoplasm on the other,helped prove

Correct AnswerverifiedShow Answer

The concept that an egg contains the building material that must somehow be assembled is called

Correct AnswerverifiedShow Answer

Neighboring cells influence the development of each other,either by direct contact or by production of chemical signals,in

Correct AnswerverifiedShow Answer

The cortical reaction that follows fertilization causes a hardening of the vitelline envelope to produce the _________ _________.

Correct Answerverifiedfertilizat...View AnswerShow Answer

In the human,which part of the blastocyst will develop into the embryo proper (versus the supporting placenta) ?

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In nearly all metazoa,"germ layers" is a term that describes

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Somites,which form segmental muscles and vertebrae,develop from which germ layer?

Correct AnswerverifiedShow Answer

Rotational cleavage is unique to

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The major group of the animal kingdom that includes animals that in their development show spiral cleavage and mosaic development is the __________.

Correct AnswerverifiedShow Answer

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The cortical reaction that follows fertilization causes a hardening of the vitelline envelope to produce the _ _.

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fertilizat...
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