Question 1

A couple conceives a child on January 1st.Which day falls within the period of somitogenesis?

Accepted Answer

A)  January 3
B)  January 7
C)  January 17
D)  January 31E) A) and B)
F) A) and C)

Question 2

What developmental event was key to the evolution of the chordates,by forming the notochord and dorsal nerve cord?

Accepted Answer

A)  morphogenesis
B)  organogenesis
C)  gastrulation
D)  neural crest formation
E)  neurulationF) B) and D)
G) A) and E)

Question 3

What prevents menstruation from occurring in the 10th week when the corpus luteum regresses?

Accepted Answer

A)  The follicle takes over secretion of hCG.
B)  The follicle takes over secretion of estradiol and progesterone.
C)  The placenta takes over secretion of estradiol and progesterone.
D)  The cervix takes over secretion of oxytocin and prostaglandins.E) A) and C)
F) A) and B)

Question 4

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) B) and D)
G) A) and E)

Question 5

Referring to the figure of sperm penetration and fusion,match the lettered description with the correct numbered step in the figure.
 
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 corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.

-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 corona radiata.
E)  The sperm nucleus dissociates and enters the cytoplasm.F) Additional sperm can no longer penetrate.G) B) and C)
H) All of the above

Question 6

The snakes include some rather short and some incredibly long species,with a variation from about 100 to over 300 vertebrae.What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?

Accepted Answer

A)  Changes in genes that lay down extracellular matrix in bone
B)  Changes in genes necessary for neural crest development
C)  Changes in genes that control mitosis
D)  Changes in the somitogenesis clockE) B) and D)
F) A) and C)

Question 7

What would result if too many cells left the surface of the embryo to move inside during gastruation?

Accepted Answer

A)  Too little endoderm,resulting in missing gut and organs
B)  Too little ectoderm,resulting in missing nervous system or skin
C)  Problems in muscle development
D)  Too little protoderm,resulting in missing organsE) A) and D)
F) A) and B)

Question 8

New mothers may benefit from the aid of lactation consultants when learning to breastfeed.These consultants give advice on technique,and help the mother to feel relaxed and confident.What hormone is associated with calm,warm emotions and is also critical for the milk let-down reflex?

Accepted Answer

A)  prolactin
B)  estradiol
C)  oxytocin
D)  mammotropinE) All of the above
F) C) and D)

Question 9

Referring to the figure of sperm penetration and fusion,match the lettered description with the correct numbered step in the figure.
 
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 corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.

-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 corona radiata.
E)  The sperm nucleus dissociates and enters the cytoplasm.F) Additional sperm can no longer penetrate.G) A) and B)
H) B) and E)

Question 10

Referring to the figure of sperm penetration and fusion,match the lettered description with the correct numbered step in the figure.
 
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 corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.

-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 corona radiata.
E)  The sperm nucleus dissociates and enters the cytoplasm.F) Additional sperm can no longer penetrate.G) C) and F)
H) A) and D)

Question 11

Which are structures formed from the neural crest? (Check all that apply.)

Accepted Answer

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

Question 12

What is the main role of human chorionic gonadotropin?

Accepted Answer

A)  It stimulates the release of oxytocin from the mother's pituitary.
B)  It allows the mother to realize she is pregnant,via pregnancy tests.
C)  It is similar to FSH in stimulating follicle development.
D)  It maintains the corpus luteum.E) None of the above
F) C) and D)

Question 13

What structure is formed from both fetal and maternal tissue?

Accepted Answer

A)  chorion
B)  placenta
C)  yolk sac
D)  amnionE) None of the above
F) A) and B)

Question 14

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

Accepted Answer

A)  Both the cell and the blastula will die.
B)  All the cells are already committed and therefore are not viable.
C)  The embryo from which the cell was removed still remains viable and can form a normal chimp.D) All of the above
E) B) and C)

Question 15

Which of the following are fetal membranes? (Check all that apply.)

Accepted Answer

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

Question 16

When the placenta is delivered,what event allows secretion of prolactin and milk production?

Accepted Answer

A)  a surge of adrenaline and endorphins
B)  sudden drop in progesterone and estradiol
C)  gradual drop in oxytocin
D)  sudden rise in FSH and LHE) C) and D)
F) B) and C)

Question 17

Choose the letter of the best match from the following:
-The embryo is now called the fetus.

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 D)
G) D) and E)

Question 18

The hollow crater formed during gastrulation is known as

Accepted Answer

A)  acrosome
B)  archenteron
C)  morula
D)  cleavage furrow
E)  trophoblastF) C) and D)
G) B) and E)

Question 19

Which of the following is an accurate statement?

Accepted Answer

A)  Both diagrams show developmental sequences occurring in the same animal.
B)  Both diagrams show blastulae.
C)  Diagram II shows gastrulation in a bird.
D)  Diagram I shows gastrulation in a frog.
E)  Diagram I shows gastrulation in a mammal and diagram II shows gastrulation in a reptile.F) C) and E)
G) A) and D)

Question 20

The placenta protects the developing fetus from harmful substances like alcohol or drugs.

Accepted Answer

A) True 
 B)False

Exam 52: Animal Development

Choose the letter of the best match from the following: -The embryo is now called the fetus.

Correct Answer
verified

A couple conceives a child on January 1st.Which day falls within the period of somitogenesis?

Correct Answer
verified

Which of the following is an accurate statement?

Correct Answer
verified

The placenta protects the developing fetus from harmful substances like alcohol or drugs.

Correct Answer
verified

Correct Answer
verified

When the placenta is delivered,what event allows secretion of prolactin and milk production?

Correct Answer
verified

What is the main role of human chorionic gonadotropin?

Correct Answer
verified

What would result if too many cells left the surface of the embryo to move inside during gastruation?

Correct Answer
verified

Which are structures formed from the neural crest? (Check all that apply.)

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Which of the following are fetal membranes? (Check all that apply.)

Correct Answer
verified

What prevents menstruation from occurring in the 10^th week when the corpus luteum regresses?

Correct Answer
verified

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

Correct Answer
verified

The snakes include some rather short and some incredibly long species,with a variation from about 100 to over 300 vertebrae.What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?

Correct Answer
verified

What developmental event was key to the evolution of the chordates,by forming the notochord and dorsal nerve cord?

Correct Answer
verified

The hollow crater formed during gastrulation is known as

Correct Answer
verified

What structure is formed from both fetal and maternal tissue?

Correct Answer
verified

New mothers may benefit from the aid of lactation consultants when learning to breastfeed.These consultants give advice on technique,and help the mother to feel relaxed and confident.What hormone is associated with calm,warm emotions and is also critical for the milk let-down reflex?

Correct Answer
verified

Correct Answer
verified

Exam 52: Animal Development

Choose the letter of the best match from the following: -The embryo is now called the fetus.

Correct AnswerverifiedShow Answer

A couple conceives a child on January 1st.Which day falls within the period of somitogenesis?

Correct AnswerverifiedShow Answer

Which of the following is an accurate statement?

Correct AnswerverifiedShow Answer

The placenta protects the developing fetus from harmful substances like alcohol or drugs.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When the placenta is delivered,what event allows secretion of prolactin and milk production?

Correct AnswerverifiedShow Answer

What is the main role of human chorionic gonadotropin?

Correct AnswerverifiedShow Answer

What would result if too many cells left the surface of the embryo to move inside during gastruation?

Correct AnswerverifiedShow Answer

Which are structures formed from the neural crest? (Check all that apply.)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following are fetal membranes? (Check all that apply.)

Correct AnswerverifiedShow Answer

What prevents menstruation from occurring in the 10th week when the corpus luteum regresses?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The snakes include some rather short and some incredibly long species,with a variation from about 100 to over 300 vertebrae.What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?

Correct AnswerverifiedShow Answer

What developmental event was key to the evolution of the chordates,by forming the notochord and dorsal nerve cord?

Correct AnswerverifiedShow Answer

The hollow crater formed during gastrulation is known as

Correct AnswerverifiedShow Answer

What structure is formed from both fetal and maternal tissue?

Correct AnswerverifiedShow Answer

New mothers may benefit from the aid of lactation consultants when learning to breastfeed.These consultants give advice on technique,and help the mother to feel relaxed and confident.What hormone is associated with calm,warm emotions and is also critical for the milk let-down reflex?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct Answer
verified

Correct Answer
verified

What prevents menstruation from occurring in the 10^th week when the corpus luteum regresses?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified