Question 1

The hollow crater formed during gastrulation is known as the

Accepted Answer

A)  acrosome.
B)  archenteron.
C)  morulla.
D)  cleavage furrow.
E)  trophoblast.F) A) and B)
G) A) and C)

Question 2

Segmented blocks of tissue that form on either side of the notochord and are continuously added during development are called

Accepted Answer

A)  blastopores.
B)  gastropores.
C)  somites.
D)  amniotic cells.
E)  sensory neurons.F) C) and E)
G) A) and E)

Question 3

The elaboration of a notochord and a dorsal nerve chord,the key developmental event that marks the evolution of the chordates,is referred to as

Accepted Answer

A)  morphogenesis.
B)  organogenesis.
C)  gastrulation.
D)  neural crest formation.
E)  neurulation.F) B) and D)
G) C) and E) E

Question 4

Working in an experimental fertility clinic,a researcher removes one cell in an 8-cell stage chimpanzee blastula.What is the likely result?

Accepted Answer

A)  Both the cell and the blastula will die.
B)  The removed cell can develop into a viable chimp.
C)  All the cells are already committed and therefore are not viable.
D)  The blastula still has the capability of implantation and growth.
E)  Both can be implanted and will result in identical twin chimps.F) B) and C)
G) B) and E)

Question 5

Neurulation is the developmental stage in which tissue differentiation begins,with the formation of which of the following morphological features?

Accepted Answer

A)  notochord
B)  ectoderm,endoderm,and mesoderm
C)  hollow dorsal nerve cord
D)  notochord and hollow dorsal nerve cord
E)  ectoderm,endoderm,mesoderm,and hollow dorsal nerve cordF) B) and C)
G) B) and E)

Question 6

_________ is the initial event in development.

Accepted Answer

A)  Fertilization
B)  Cleavage
C)  Gastrulation
D)  OrganogensisE) All of the above
F) A) and B)

Question 7

The period of rapid division in which the embryo does not increase in overall size is called

Accepted Answer

A)  syngamy.
B)  cleavage.
C)  neurulation.
D)  meiosis.
E)  crest formation.F) All of the above
G) C) and D)

Question 8

The milk ejection reflex requires the action of the hormone ___________.

Accepted Answer

A)  prolactin
B)  estradiol
C)  oxytocin
D)  somatomammotropinE) B) and C)
F) A) and D)

Question 9

The appearance of the __________ in the developing embryo marked the beginning of the first truly vertebrate phase of development.

Accepted Answer

A)  limb buds
B)  heart
C)  neural crest
D)  gastrulaE) All of the above
F) None of the above

Question 10

The cleavage pattern is influenced by the amount of __________ and its distribution in the egg.

Accepted Answer

A)  albumen
B)  yolk
C)  shell
D)  airE) A) and B)
F) A) and C)

Question 11

Which of the following is not the developmental product of the primary cell layer,ectoderm?

Accepted Answer

A)  epidermis
B)  gonads
C)  central nervous system
D)  sense organs
E)  neural crestF) All of the above
G) C) and D)

Question 12

What actually begins the uterine contractions which leads to giving birth?

Accepted Answer

A)  oxytocin
B)  prolactin
C)  estrogen
D)  prostaglandins
E)  the movement of the fetusF) C) and D)
G) A) and B)

Question 13

Which of the following are stages in fertilization?

Accepted Answer

A)  cleavage and fusion
B)  fusion
C)  activation
D)  penetration
E)  fusion,activation,and penetrationF) B) and C)
G) None of the above E

Question 14

The production of milk,called lactation,is stimulated by ____________.

Accepted Answer

A)  adrenaline
B)  prolactin
C)  estradiol
D)  oxytocinE) A) and B)
F) C) and D)

Question 15

During the ______ month,morphogenesis,the formation of the shape of the adult in miniature limb formation takes place.

Accepted Answer

A)  first
B)  second
C)  third
D)  fourthE) None of the above
F) All of the above

Question 16

Brain growth in humans is different from other mammals in that

Accepted Answer

A)  in humans brain growth is complete by the third trimester.
B)  in humans brain growth stops at birth.
C)  human growth is not allometriC.
D)  in humans brain growth continues after birth.
E)  only humans develop a cerebrum.F) None of the above
G) B) and C)

Question 17

Select the correct sequence of vertebrate development beginning with fertilization.

Accepted Answer

A)  fertilization  →\rarr→  cleavage  →\rarr→  gastrulation  →\rarr→  neurulation  →\rarr→  organogenesis →\rarr→ neural crest formation
B)  fertilization  →\rarr→ gastrulation  →\rarr→  cleavage  →\rarr→  neurulation  →\rarr→  neural crest formation  →\rarr→  organogenesis
C)  fertilization  →\rarr→  neurulation  →\rarr→  gastrulation →\rarr→  organogenesis  →\rarr→  neural crest formation  →\rarr→ cleavage
D)  fertilization  →\rarr→  gastrulation  →\rarr→  neurulation  →\rarr→  neural crest formation  →\rarr→ cleavage  →\rarr→  organogenesis
E)  fertilization  →\rarr→  cleavage  →\rarr→  gastrulation  →\rarr→  neurulation  →\rarr→  neural crest formation  →\rarr→  organogenesis F) B) and C)
G) B) and E) E

Question 18

Select the incorrectly matched germ layer and its developmental tissue fate.

Accepted Answer

A)  ectoderm-lining of the digestive tract
B)  ectoderm-epidermis
C)  mesoderm-blood vessels
D)  mesoderm-gonads
E)  endoderm-lining of the respiratory tractF) B) and C)
G) A) and E)

Question 19

There is a protective layer between the granulosa cells and the egg's plasma membrane or zona pellucida.This layer is made of a

Accepted Answer

A)  glycoprotein.
B)  glycolipid.
C)  protein.
D)  lipoprotein.
E)  saturated fatty acid.F) A) and B)
G) None of the above

Question 20

All of the following are features representing blastula except

Accepted Answer

A)  each cell is in contact with a different set of neighboring cells.
B)  some blastomeres are larger than the others and thus not equivalent.
C)  differentiation into notochord and the hollow nerve chord takes place.
D)  different blastomeres receive different components of the egg cytoplasm.
E)  some blastomeres may divide slower than others depending on the amount of yolk.F) A) and E)
G) A) and D)

Exam 54: Animal Development

The hollow crater formed during gastrulation is known as the

Correct AnswerverifiedShow Answer

Segmented blocks of tissue that form on either side of the notochord and are continuously added during development are called

Correct AnswerverifiedShow Answer

The elaboration of a notochord and a dorsal nerve chord,the key developmental event that marks the evolution of the chordates,is referred to as

Correct AnswerverifiedE

Working in an experimental fertility clinic,a researcher removes one cell in an 8-cell stage chimpanzee blastula.What is the likely result?

Correct AnswerverifiedShow Answer

Neurulation is the developmental stage in which tissue differentiation begins,with the formation of which of the following morphological features?

Correct AnswerverifiedShow Answer

_________ is the initial event in development.

Correct AnswerverifiedShow Answer

The period of rapid division in which the embryo does not increase in overall size is called

Correct AnswerverifiedShow Answer

The milk ejection reflex requires the action of the hormone ___________.

Correct AnswerverifiedShow Answer

The appearance of the __________ in the developing embryo marked the beginning of the first truly vertebrate phase of development.

Correct AnswerverifiedShow Answer

The cleavage pattern is influenced by the amount of __________ and its distribution in the egg.

Correct AnswerverifiedShow Answer

Which of the following is not the developmental product of the primary cell layer,ectoderm?

Correct AnswerverifiedShow Answer

What actually begins the uterine contractions which leads to giving birth?

Correct AnswerverifiedShow Answer

Which of the following are stages in fertilization?

Correct AnswerverifiedE

The production of milk,called lactation,is stimulated by ____________.

Correct AnswerverifiedShow Answer

During the ______ month,morphogenesis,the formation of the shape of the adult in miniature limb formation takes place.

Correct AnswerverifiedShow Answer

Brain growth in humans is different from other mammals in that

Correct AnswerverifiedShow Answer

Select the correct sequence of vertebrate development beginning with fertilization.

Correct AnswerverifiedE

Select the incorrectly matched germ layer and its developmental tissue fate.

Correct AnswerverifiedShow Answer

There is a protective layer between the granulosa cells and the egg's plasma membrane or zona pellucida.This layer is made of a

Correct AnswerverifiedShow Answer

All of the following are features representing blastula except

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified