Question 1

The neural crest produces all of the following except

Accepted Answer

A)  a gill chamber of primitive chordates.
B)  sensory neurons of the dorsal root ganglia.
C)  Schwann cells.
D)  blastopores.
E)  olfactory and hearing organs.F) A) and E)
G) B) and E)

Question 2

The mesoderm gives rise to all except

Accepted Answer

A)  the head.
B)  somites.
C)  cartilage.
D)  dermis.
E)  the kidney.F) A) and D)
G) A) and B)

Question 3

The human placenta is formed by the interaction of uterine tissue and the

Accepted Answer

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

Question 4

Choose the letter of the best match from the following:
-Major nerve tracts are formed.

Accepted Answer

A)  third trimester of pregnancy
B)  second month of pregnancy
C)  first month of pregnancy
D)  second trimester of pregnancy
E)  third month of pregnancyF) All of the above
G) A) and B)

Question 5

Which of the following stages of development are incorrectly matched with the times elapsed from fertilization?

Accepted Answer

A)  implantation-six days
B)  gastrulation-two weeks
C)  neurulation-three weeks
D)  fetus formation-six weeks
E)  morphogenesis-second monthF) C) and E)
G) None of the above

Question 6

Referring to the figure below,choose the letter of the best match from with the following steps of sperm penetration and fusion. 
-Step IV

Accepted Answer

A)  Some of the zona pellucida is degraded by acrosomal enzymes.
B)  Enzymes are released by cortical granules that harden the zona pellucida.
C)  Sperm and egg fuse at the plasma membrane.
D)  Sperm penetrates the cronoa radiata.
E)  The sperm nucleus dissociates and enters the cytoplasm.F) Additional sperm can no longer penetrate.G) E) and F)
H) A) and B)

Question 7

Which of the following is not a mechanism to prevent polyspermy?

Accepted Answer

A)  change in membrane potential of egg
B)  altering composition of exterior egg coat
C)  cortical granule enzymes remove sperm receptors from egg
D)  vitelline envelopes lift off surface of egg
E)  sperm nuclei degraded inside egg allowing only one to fuseF) A) and B)
G) B) and E)

Question 8

The appearance of which of the following structures has been widely accepted as the key event in the evolution of vertebrates?

Accepted Answer

A)  neural crest
B)  neural groove
C)  neural tube
D)  spinal cord
E)  placentaF) B) and D)
G) B) and E)

Question 9

In the diagram,which of the following is true?

Accepted Answer

A)  Both diagrams show developmental sequences occurring in the same animal.
B)  Both diagrams show blastulas.
C)  Diagram II shows gastrulation in a bird.
D)  Diagram I shows gastrulation in a frog.
E)  Diagram II shows gastrulation in a mammal and diagram ii shows gastrulation in a reptilE.F) All of the above
G) A) and E)

Question 10

Milk production in mammary alveoli is stimulated by

Accepted Answer

A)  oxytocin.
B)  prolactin.
C)  chorionic gonadotropin.
D)  progesterone.
E)  estrogen.F) C) and D)
G) B) and E)

Question 11

The human placenta is formed from a combination of the

Accepted Answer

A)  chorionic frondosum and the chorionic villus.
B)  chorionic frondosum and the decidua basalis.
C)  decidua basalis and the chorionic villus.
D)  chorionic villus and the endometrium.
E)  chorionic frondosum and the amnion.F) B) and D)
G) A) and B)

Question 12

All of the following statements are correct about the human placenta except

Accepted Answer

A)  oxygen can diffuse from the mother's blood into the fetal blood.
B)  maternal blood and fetal blood are mixed in the placenta.
C)  alcohol is not prevented from entering the fetal blood supply.
D)  antibiotics that the mother is taking are not stopped by the placenta and can enter the fetal blooD.
E)  the human placenta releases hCG.F) A) and B)
G) A) and C)

Question 13

By the end of the _____ week of pregnancy,in the neurulation stage,the first somites appear from which the muscles,vertebrae,and connective tissues develop.

Accepted Answer

A)  first
B)  third
C)  eighth
D)  tenthE) B) and C)
F) C) and D)

Question 14

Choose the letter of the best match from the following:
-Neurulation occurs.

Accepted Answer

A)  third trimester of pregnancy
B)  second month of pregnancy
C)  first month of pregnancy
D)  second trimester of pregnancy
E)  third month of pregnancyF) C) and E)
G) B) and E)

Question 15

The developing embryo of reptiles,birds,and mammals is encased in the fluid-filled ________ membrane.

Accepted Answer

A)  amniotic.
B)  embryonic.
C)  chorioniC.
D)  yolk sac.
E)  allantois.F) D) and E)
G) All of the above

Question 16

In this diagram,which of the following numbers represents the actual event of egg activation?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) B) and C)
G) B) and D)

Question 17

Which of the following animals undergoes true holoblastic cleavage?

Accepted Answer

A)  butterfly
B)  ant
C)  snail
D)  tuna
E)  birdF) C) and D)
G) A) and B)

Question 18

There are enzymes located in the acrosome that enables a sperm to tunnel its way through the

Accepted Answer

A)  blastula to the egg's plasma membrane.
B)  zona pellucida to the egg's plasma membrane.
C)  archenteron to the egg's plasma membrane.
D)  allantois to the egg's plasma membrane.
E)  chorion to the egg's plasma membranE.F) A) and D)
G) B) and C)

Question 19

The head of a sperm is capped with an organelle that contains glycoprotein-digesting enzymes.This organelle is the

Accepted Answer

A)  zona pellucidA.
B)  acrosome.
C)  granulosa.
D)  blastula.
E)  neural cap.F) B) and C)
G) A) and D)

Question 20

Which of the following is not an effect resulting from sperm penetration?

Accepted Answer

A)  haploid nucleus of egg undergoes final mitotic division
B)  eggs complete meiosis
C)  outer pigmented cap of egg cytoplasm rotates toward point of entry
D)  sharp increase in protein synthesis
E)  movement of egg cytoplasmF) A) and E)
G) C) and D)

Exam 54: Animal Development

The head of a sperm is capped with an organelle that contains glycoprotein-digesting enzymes.This organelle is the

Correct AnswerverifiedShow Answer

By the end of the _____ week of pregnancy,in the neurulation stage,the first somites appear from which the muscles,vertebrae,and connective tissues develop.

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In the diagram,which of the following is true?

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Neurulation occurs.

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Choose the letter of the best match from the following: -Major nerve tracts are formed.

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All of the following statements are correct about the human placenta except

Correct AnswerverifiedShow Answer

The developing embryo of reptiles,birds,and mammals is encased in the fluid-filled ________ membrane.

Correct AnswerverifiedShow Answer

The human placenta is formed by the interaction of uterine tissue and the

Correct AnswerverifiedShow Answer

Milk production in mammary alveoli is stimulated by

Correct AnswerverifiedShow Answer

The human placenta is formed from a combination of the

Correct AnswerverifiedShow Answer

Referring to the figure below,choose the letter of the best match from with the following steps of sperm penetration and fusion. -Step IV

Correct AnswerverifiedShow Answer

There are enzymes located in the acrosome that enables a sperm to tunnel its way through the

Correct AnswerverifiedShow Answer

The neural crest produces all of the following except

Correct AnswerverifiedShow Answer

Which of the following stages of development are incorrectly matched with the times elapsed from fertilization?

Correct AnswerverifiedShow Answer

Which of the following animals undergoes true holoblastic cleavage?

Correct AnswerverifiedShow Answer

Which of the following is not an effect resulting from sperm penetration?

Correct AnswerverifiedShow Answer

The mesoderm gives rise to all except

Correct AnswerverifiedShow Answer

Which of the following is not a mechanism to prevent polyspermy?

Correct AnswerverifiedShow Answer

The appearance of which of the following structures has been widely accepted as the key event in the evolution of vertebrates?

Correct AnswerverifiedShow Answer

In this diagram,which of the following numbers represents the actual event of egg activation?

Correct AnswerverifiedShow Answer

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