Question 1

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

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) All of the above

Question 2

Together,the chorionic frondosum and decidua basalis form a single functioning unit,the ________.

Accepted Answer

A)  chorion
B)  placenta
C)  yolk sac
D)  amnionE) A) and B)
F) B) and D)

Question 3

In mammals,egg activation is characterized by all of the following except

Accepted Answer

A)  prevention of entry of other sperm by changes in the egg membrane.
B)  stimulation of the egg chromosomes to complete the second meiotic division.
C)  one of the two nuclei is extruded from the egg as a second polar body.
D)  cytoplasmic movements triggered around the point of sperm entry.
E)  the cleavage of sperm nuclei.F) A) and B)
G) A) and E)

Question 4

Certain groups of cells move inward from the surface of the blastula in a carefully orchestrated migration called

Accepted Answer

A)  blastulation.
B)  archenteron formation.
C)  morulla formation.
D)  gastrulation.
E)  cleavagE.F) A) and C)
G) A) and D)

Question 5

Which of the following regarding the Spemann organizer is false?

Accepted Answer

A)  The dorsal lip cells directly activate dorsal development.
B)  The organizer forms in the area of the grey crescent.
C)  The organizer determines the dorsal-ventral axis.
D)  Signaling molecules from the organizer inhibit ventral development.
E)  The point of sperm entry determines the orientation of the organizer.F) A) and E)
G) C) and D)

Question 6

Which of the following leads to the occurrence of vertebrate sense organs?

Accepted Answer

A)  both adrenal medullary cells and sympathetic neurons derive from the neural crest
B)  neural crest cells form both neurons that carry messages and cartilaginous bars
C)  the neural crest and associated sensory ganglia
D)  formation of the endoderm
E)  formation of the autonomic nervous systemF) A) and B)
G) B) and D)

Question 7

Which of the following activates the egg?

Accepted Answer

A)  entrance of sperm into the zona pellucida
B)  contact of sperm with the outside of the zona pellucida
C)  contact of sperm with the vitelline envelope
D)  fusion of sperm and egg membranes
E)  fusion of sperm and egg nucleiF) A) and B)
G) C) and E)

Question 8

In mammals,the embryonic cells form an inner cell mass that will become the body of the embryo and a layer of surrounding cells called the ____________________.

Accepted Answer

A)  blastocoel
B)  yolk
C)  blastodisc
D)  trophoblastE) None of the above
F) A) and B)

Question 9

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

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) A) and E)
H) D) and E)

Question 10

Birth occurs in response to uterine contractions stimulated by

Accepted Answer

A)  FSH and prostaglandins.
B)  LH and prostaglandins.
C)  oxytocin and prostaglandins.
D)  prolactin and prostaglandins.
E)  hCG and prostaglandins.F) B) and C)
G) B) and E)

Question 11

Removing some fluid from directly around a developing human fetus is performed by inserting a long needle into the belly of the female patient.What membranes will be punctured in this process?

Accepted Answer

A)  chorion
B)  amnion
C)  chorionic villi
D)  external epithelium of motherE) B) and C)
F) None of the above

Question 12

An outpouching of the gut that serves to store the uric acid excretion in the urine of developing birds is called the

Accepted Answer

A)  acrosome.
B)  archenteron.
C)  placenta.
D)  chorion.
E)  allantois.F) C) and D)
G) B) and D)

Question 13

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

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) A) and E)
H) All of the above

Question 14

Choose the letter of the best match from the following:
-The heart begins to beat.

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) A) and C)
G) A) and D)

Question 15

Which of the following is not a fetal membrane?

Accepted Answer

A)  amnion
B)  endometrium
C)  chorion
D)  yolk sac
E)  allantoisF) B) and D)
G) None of the above

Question 16

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

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) C) and E)
H) B) and C)

Question 17

One of the hormones released by the placenta is __________,which maintains the mother's corpus luteum and is the hormone assayed in pregnancy tests.

Accepted Answer

A)  hCG
B)  estrogen
C)  progesterone
D)  FSH
E)  LHF) B) and C)
G) A) and E)

Question 18

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

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) A) and C)
H) D) and F)

Question 19

The trophoblast implants into the endometrial lining of the mother's uterus and becomes the ________ membrane.

Accepted Answer

A)  chorionic
B)  amnionic
C)  umbilical
D)  placentalE) B) and C)
F) A) and D)

Question 20

Which of the following statements about human chorionic gonadotropin is not correct?

Accepted Answer

A)  It is released by the placentA.
B)  It stimulates the release of oxytocin from the mother's pituitary.
C)  It is the hormone assayed in pregnancy tests.
D)  It is almost identical to the action of lutenizing hormone.
E)  It maintains the mother's corpus luteum.F) A) and D)
G) B) and D)

Exam 54: Animal Development

Birth occurs in response to uterine contractions stimulated by

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Which of the following regarding the Spemann organizer is false?

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

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In mammals,egg activation is characterized by all of the following except

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An outpouching of the gut that serves to store the uric acid excretion in the urine of developing birds is called the

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

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Which of the following leads to the occurrence of vertebrate sense organs?

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The trophoblast implants into the endometrial lining of the mother's uterus and becomes the ________ membrane.

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Which of the following is not a fetal membrane?

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

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Together,the chorionic frondosum and decidua basalis form a single functioning unit,the ________.

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Which of the following activates the egg?

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Certain groups of cells move inward from the surface of the blastula in a carefully orchestrated migration called

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Choose the letter of the best match from the following: -The heart begins to beat.

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

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In mammals,the embryonic cells form an inner cell mass that will become the body of the embryo and a layer of surrounding cells called the ____________________.

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Which of the following statements about human chorionic gonadotropin is not correct?

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

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One of the hormones released by the placenta is __________,which maintains the mother's corpus luteum and is the hormone assayed in pregnancy tests.

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Removing some fluid from directly around a developing human fetus is performed by inserting a long needle into the belly of the female patient.What membranes will be punctured in this process?

Correct AnswerverifiedShow Answer

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