Question 1

The figure shows that,relative to the rest of the body,the _______ in a newborn baby is/are larger than in an adult.

Accepted Answer

A)   It would have a notochord.
B)   It would lack a tail.
C)   It would have a ventral nerve chord.
D)   Its body would be much smaller than that of an adult but with the same proportions,because a tunicate goes through direct development.
E)   Its body would have different proportions from that of an adult,because tunicate growth is allometric.F) B) and E)
G) A) and E)

Question 2

If a cell is removed from an eight-cell embryo and a particular portion of the organism fails to form,the development is termed

Accepted Answer

A)   regulative.
B)   controlled.
C)   induced.
D)   irreversible.
E)   mosaic.F) B) and C)
G) D) and E)

Question 3

Hans Spemann and Hilde Mangold's famous experiment involved transplanting mesodermal tissue from the _______ of an early gastrula stage salamander embryo.

Accepted Answer

dorsal bla...

Question 4

The developing human is most susceptible to the occurrence of birth defects from radiation or chemical insults

Accepted Answer

A)   at the time of birth.
B)   during the third trimester of gestation.
C)   during the first trimester of gestation.
D)   when it is a zygote.
E)   during the final stages of organ formation.F) All of the above
G) C) and D)

Question 5

In humans,the amnion forms from the

Accepted Answer

A)   hypoblast.
B)   epiblast.
C)   chorion.
D)   trophoblast.
E)   yolk sac.F) A) and B)
G) B) and D)

Question 6

Exposure to toxins is particularly dangerous to the embryo in the first trimester of pregnancy because

Accepted Answer

A)   induction of organ systems is occurring during this period.
B)   rapid cell division is taking place during this period.
C)   tissue differentiation is occurring at its highest levels during this period.
D)   organs are beginning to form during this period.
E)   All of the aboveF) A) and E)
G) A) and C)

Question 7

What is the difference between a human fetus and embryo?

Accepted Answer

A)   The term "fetus" applies only to the earliest stages of embryonic development.
B)   A fetus is an embryo carried longer than 200 days.
C)   A fetus is the medical and legal term for a human embryo after the first trimester.
D)   An embryo becomes a fetus when the internal organs are completely developed.
E)   An embryo becomes a fetus at birth.F) B) and C)
G) B) and E)

Question 8

If the blastopore dorsal lip is grafted from one salamander embryo onto a second embryo,the second dorsal lip will

Accepted Answer

A)   change the polarity of the adjacent segments.
B)   block gastrulation.
C)   change the developmental fate of the surrounding cells.
D)   change the prospective potency of the surrounding cells.
E)   cause rapid cell division.F) A) and B)
G) C) and D)

Question 9

Following gastrulation in vertebrates,the mesodermal cells contribute to the developing

Accepted Answer

A)   brain and nervous system.
B)   skeletal system and muscles.
C)   inner lining of the gut and respiratory tract.
D)   pigment cells.
E)   epidermis.F) B) and C)
G) A) and B)

Question 10

Experiments on amphibian embryos have shown that the notochord secretes Chordin and Noggin.If you performed an experiment in which you blocked the production of Chordin and Noggin in the early embryo,the expected result would be an embryo

Accepted Answer

A)   that did not gastrulate.
B)   that formed two embryos,joined belly-to-belly.
C)   that lacked a developing nervous system.
D)   that lacked an outer covering of epidermis.
E)   in which the blastopore became the mouth.F) A) and E)
G) B) and C)

Question 11

Which statement about the neural tube is true?

Accepted Answer

A)   It gives rise to the forebrain,midbrain,and hindbrain.
B)   It gives rise to the epidermis.
C)   It is formed from the notochord.
D)   It develops from endoderm.
E)   It forms at the beginning of gastrulation.F) B) and D)
G) C) and E)

Question 12

The mesoderm

Accepted Answer

A)   is located on the outside of the embryo.
B)   is formed during cleavage.
C)   is found in blastula-stage embryos.
D)   gives rise to the lining of the gut.
E)   lies between the endoderm and ectoderm.F) A) and E)
G) A) and B)

Question 13

Genetic testing of an embryo is available to couples who want to avoid passing on a genetic defect to their offspring.One method of testing involves removing a single blastomere from an 8-cell stage embryo and analyzing it to determine if it carries the mutant gene.If no mutation is found,the now 7-cell embryo can be implanted in the woman,and it can go on to develop into a healthy infant.These results indicate that

Accepted Answer

A)   at least one of the cells in the human embryo at the 8-cell stage is not used in development.
B)   the embryo can compensate for the loss of a cell.
C)   not all cells are equally important.
D)   the human embryo at the 8-cell stage has not yet formed an inner-cell mass.
E)   the cell that is removed for testing is derived from the trophoblast.F) A) and C)
G) A) and B)

Question 14

The cells that form the neural tube come from the

Accepted Answer

A)   notochord.
B)   mesoderm.
C)   endoderm.
D)   ectoderm.
E)   neural crest.F) A) and E)
G) A) and B)

Question 15

Following gastrulation in vertebrates,the endodermal cells contribute predominantly to the developing

Accepted Answer

A)   brain,nervous system,and nails.
B)   skeletal system and muscles.
C)   lining of the digestive and respiratory tracts.
D)   sweat glands and milk secretory glands.
E)   heart and blood vesselsF) A) and E)
G) A) and D)

Question 16

The region of the frog egg that is darkly pigmented is known as the _______ pole.

Accepted Answer

The answer of The region of the frog egg that...

Question 17

The process in development by which germ layers form and take specific positions relative to one another is called _______.

Accepted Answer

The answer of The process in development by which germ...

Question 18

You are presented with an egg that is so rich in yolk that cleavage furrows do not pass entirely through the yolk.As development proceeds,a disc of cells accumulates on top of the yolk to form the embryo.This egg is most likely not the egg of a(n)

Accepted Answer

A)   turtle.
B)   bullfrog.
C)   goldfish.
D)   chicken.
E)   alligator.F) A) and E)
G) A) and D)

Question 19

Which statement about the umbilical cord is true?

Accepted Answer

A)   It contains blood vessels from the embryo and mother.
B)   It contains blood vessels just from the mother.
C)   It is derived from the inner cell mass.
D)   It is derived from the endometrium of the uterus.
E)   It carries nutrients and wastes.F) A) and B)
G) A) and E)

Question 20

In amphibian eggs,cells migrate to the interior of the embryo through the blastopore.In mammalian embryos,this migration occurs at the

Accepted Answer

A)   archenteron.
B)   primitive groove.
C)   notochord.
D)   blastopore.
E)   gray crescent.F) D) and E)
G) A) and B)

Exam 38: Animal Development

Hans Spemann and Hilde Mangold's famous experiment involved transplanting mesodermal tissue from the _______ of an early gastrula stage salamander embryo.

Correct Answer
verified
dorsal bla...
View Answer

The mesoderm

Correct Answer
verified

What is the difference between a human fetus and embryo?

Correct Answer
verified

In amphibian eggs,cells migrate to the interior of the embryo through the blastopore.In mammalian embryos,this migration occurs at the

Correct Answer
verified

The region of the frog egg that is darkly pigmented is known as the _______ pole.

Correct Answer
verified

The cells that form the neural tube come from the

Correct Answer
verified

You are presented with an egg that is so rich in yolk that cleavage furrows do not pass entirely through the yolk.As development proceeds,a disc of cells accumulates on top of the yolk to form the embryo.This egg is most likely not the egg of a(n)

Correct Answer
verified

If the blastopore dorsal lip is grafted from one salamander embryo onto a second embryo,the second dorsal lip will

Correct Answer
verified

The process in development by which germ layers form and take specific positions relative to one another is called _______.

Correct Answer
verified

Exposure to toxins is particularly dangerous to the embryo in the first trimester of pregnancy because

Correct Answer
verified

Correct Answer
verified

In humans,the amnion forms from the

Correct Answer
verified

Which statement about the neural tube is true?

Correct Answer
verified

The figure shows that,relative to the rest of the body,the _______ in a newborn baby is/are larger than in an adult.

Correct Answer
verified

The developing human is most susceptible to the occurrence of birth defects from radiation or chemical insults

Correct Answer
verified

Experiments on amphibian embryos have shown that the notochord secretes Chordin and Noggin.If you performed an experiment in which you blocked the production of Chordin and Noggin in the early embryo,the expected result would be an embryo

Correct Answer
verified

If a cell is removed from an eight-cell embryo and a particular portion of the organism fails to form,the development is termed

Correct Answer
verified

Following gastrulation in vertebrates,the endodermal cells contribute predominantly to the developing

Correct Answer
verified

Which statement about the umbilical cord is true?

Correct Answer
verified

Following gastrulation in vertebrates,the mesodermal cells contribute to the developing

Correct Answer
verified

Exam 38: Animal Development

Hans Spemann and Hilde Mangold's famous experiment involved transplanting mesodermal tissue from the _______ of an early gastrula stage salamander embryo.

Correct Answerverifieddorsal bla...View AnswerShow Answer

The mesoderm

Correct AnswerverifiedShow Answer

What is the difference between a human fetus and embryo?

Correct AnswerverifiedShow Answer

In amphibian eggs,cells migrate to the interior of the embryo through the blastopore.In mammalian embryos,this migration occurs at the

Correct AnswerverifiedShow Answer

The region of the frog egg that is darkly pigmented is known as the _______ pole.

Correct AnswerverifiedShow Answer

The cells that form the neural tube come from the

Correct AnswerverifiedShow Answer

You are presented with an egg that is so rich in yolk that cleavage furrows do not pass entirely through the yolk.As development proceeds,a disc of cells accumulates on top of the yolk to form the embryo.This egg is most likely not the egg of a(n)

Correct AnswerverifiedShow Answer

If the blastopore dorsal lip is grafted from one salamander embryo onto a second embryo,the second dorsal lip will

Correct AnswerverifiedShow Answer

The process in development by which germ layers form and take specific positions relative to one another is called _______.

Correct AnswerverifiedShow Answer

Exposure to toxins is particularly dangerous to the embryo in the first trimester of pregnancy because

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In humans,the amnion forms from the

Correct AnswerverifiedShow Answer

Which statement about the neural tube is true?

Correct AnswerverifiedShow Answer

The figure shows that,relative to the rest of the body,the _______ in a newborn baby is/are larger than in an adult.

Correct AnswerverifiedShow Answer

The developing human is most susceptible to the occurrence of birth defects from radiation or chemical insults

Correct AnswerverifiedShow Answer

Experiments on amphibian embryos have shown that the notochord secretes Chordin and Noggin.If you performed an experiment in which you blocked the production of Chordin and Noggin in the early embryo,the expected result would be an embryo

Correct AnswerverifiedShow Answer

If a cell is removed from an eight-cell embryo and a particular portion of the organism fails to form,the development is termed

Correct AnswerverifiedShow Answer

Following gastrulation in vertebrates,the endodermal cells contribute predominantly to the developing

Correct AnswerverifiedShow Answer

Which statement about the umbilical cord is true?

Correct AnswerverifiedShow Answer

Following gastrulation in vertebrates,the mesodermal cells contribute to the developing

Correct AnswerverifiedShow Answer

Correct Answer
verified
dorsal bla...
View Answer

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