Question 1

In a bird egg, the__________ provides the watery environment in which the embryo develops.

Accepted Answer

A)   amnion
B)   allantois
C)   yolk sac
D)   chorion
E)   blastocyst

Question 2

In a reptile egg, which membrane is analogous to a lung?

Accepted Answer

A)   Amnion
B)   Allantois
C)   Blastocyst
D)   Chorion
E)   Yolk sac

Question 3

At 10 weeks, the blastocyst becomes an embryo.

Accepted Answer

A) True 
 B)False

Question 4

The developmental fate of each cell is determined by chemical interactions among cells in a process called __________.

Accepted Answer

The answer of The developmental fate of each cell is...

Question 5

Most microbes cannot gain access to the fetus. However,__________ , which causes syphilis in adults, can cross the placenta and attack the fetus, causing stillbirths and mental retardation.

Accepted Answer

A)   HIV
B)   Treponema pallidum
C)   Listeria
D)   rubella
E)   Staphylococcus

Question 6

A morula is a solid ball of undifferentiated cells.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is the result of gastrulation?

Accepted Answer

A)   A hollow ball of cells
B)   The formation of organs
C)   A zygote
D)   A three-layered embryo
E)   A blastula

Question 8

The placental blood vessels

Accepted Answer

A)   manufacture hormones that slow the growth of the embryo, preventing it from outgrowing the uterus.
B)   mix maternal blood and fetal blood.
C)   allow for the exchange of wastes and nutrients but keep the maternal and fetal circulations separate.
D)   prevent all microbes and toxins from crossing from mother to child.
E)   draw oxygen from the fetal blood and pass it to the mother.

Question 9

The umbilical cord of a mammal connects the

Accepted Answer

A)   yolk sac and the allantois.
B)   embryo and the amnion.
C)   amnion and the chorion.
D)   fetus and the placenta.
E)   maternal and fetal bloodstreams. D

Question 10

__________diffuse(s)  from fetal blood to maternal blood in the placenta.

Accepted Answer

A)   Oxygen
B)   Alcohol
C)   Wastes
D)   Nutrients
E)   Infectious organisms C

Question 11

In what ways are the juveniles of direct-development species like their parents, and in what way are they different?

Accepted Answer

The juveniles look like their parents and have similar nutritional needs, but they are sexually immature.

Question 12

A human embryo has webbed fingers. Why are human babies not usually born with webbed fingers?

Accepted Answer

During development, ...

Question 13

The cells of an aging animal function less efficiently because

Accepted Answer

A)   protein synthesis ceases.
B)   damaged DNA cannot be repaired.
C)   cell metabolism is slower.
D)   cells can no longer mitotically divide.
E)   organelles and cellular components decline.

Question 14

-Metabolic wastes may be stored within structure 4, the

Accepted Answer

A)   allantois.
B)   chorion.
C)   amnion.
D)   embryo.
E)   yolk sac.

Question 15

The metamorphosis of a caterpillar into a butterfly is an example of

Accepted Answer

A)   internal development.
B)   external development.
C)   indirect development.
D)   placental development.
E)   direct development.

Question 16

In blastulas, if cells from an area that would normally become skin are transplanted into an area that would become the nervous system, the transplanted cells will form structures of the nervous system.

Accepted Answer

A) True 
 B)False

Question 17

The outer cell layer of the blastocyst becomes the __________, which forms the embryonic portion of the placenta.

Accepted Answer

A)   inner cell mass
B)   primitive streak
C)   chorion
D)   embryonic disk
E)   yolk sac

Question 18

The nervous system develops from the endoderm.

Accepted Answer

A) True 
 B)False

Question 19

In humans, fertilization occurs in the

Accepted Answer

A)   uterus.
B)   testes.
C)   uterine tube.
D)   vagina.
E)   ovary.

Question 20

In the 1920s, two German embryologists, Hans Spemann and Hilde Mangold, demonstrated that a small patch of cells, called the dorsal lip of the blastopore, would

Accepted Answer

A)   induce the surrounding cells to differentiate.
B)   form the chorion.
C)   become the digestive tract.
D)   become the neural tube.
E)   lack the genes necessary to develop the embryo.

Exam 43: Animal Development

In a bird egg, the__________ provides the watery environment in which the embryo develops.

Correct AnswerverifiedShow Answer

In a reptile egg, which membrane is analogous to a lung?

Correct AnswerverifiedShow Answer

At 10 weeks, the blastocyst becomes an embryo.

Correct AnswerverifiedShow Answer

The developmental fate of each cell is determined by chemical interactions among cells in a process called __________.

Correct AnswerverifiedShow Answer

Most microbes cannot gain access to the fetus. However,__________ , which causes syphilis in adults, can cross the placenta and attack the fetus, causing stillbirths and mental retardation.

Correct AnswerverifiedShow Answer

A morula is a solid ball of undifferentiated cells.

Correct AnswerverifiedShow Answer

Which of the following is the result of gastrulation?

Correct AnswerverifiedShow Answer

The placental blood vessels

Correct AnswerverifiedShow Answer

The umbilical cord of a mammal connects the

Correct AnswerverifiedD

__________diffuse(s) from fetal blood to maternal blood in the placenta.

Correct AnswerverifiedC

In what ways are the juveniles of direct-development species like their parents, and in what way are they different?

Correct AnswerverifiedThe juveniles look like their parents and have similar nutritional needs, but they are sexually immature.

A human embryo has webbed fingers. Why are human babies not usually born with webbed fingers?

Correct AnswerverifiedDuring development, ...View AnswerShow Answer

The cells of an aging animal function less efficiently because

Correct AnswerverifiedShow Answer

-Metabolic wastes may be stored within structure 4, the

Correct AnswerverifiedShow Answer

The metamorphosis of a caterpillar into a butterfly is an example of

Correct AnswerverifiedShow Answer

In blastulas, if cells from an area that would normally become skin are transplanted into an area that would become the nervous system, the transplanted cells will form structures of the nervous system.

Correct AnswerverifiedShow Answer

The outer cell layer of the blastocyst becomes the __________, which forms the embryonic portion of the placenta.

Correct AnswerverifiedShow Answer

The nervous system develops from the endoderm.

Correct AnswerverifiedShow Answer

In humans, fertilization occurs in the

Correct AnswerverifiedShow Answer

In the 1920s, two German embryologists, Hans Spemann and Hilde Mangold, demonstrated that a small patch of cells, called the dorsal lip of the blastopore, would

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
D

Correct Answer
verified
C

Correct Answer
verified
The juveniles look like their parents and have similar nutritional needs, but they are sexually immature.

Correct Answer
verified
During development, ...
View 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