Question 1

The formation of the lens of the vertebrate eye from a skin layer in contact with an outgrowth of the embryonic brain is an example of

Accepted Answer

A)   cellular aggregation.
B)   induction.
C)   morphogenesis.
D)   gastrulation.
E)   neurulation.F) None of the above
G) A) and C)

Question 2

Prevention of polyspermy depends upon changes in the plasma membrane of the egg and in the zona pellucida.

Accepted Answer

A) True 
 B)False

Question 3

By the end of the eighth week of development, all organ systems are developed in the embryo.

Accepted Answer

A) True 
 B)False

Question 4

Morphogenesis is characterized by

Accepted Answer

A)   cell division and growth in size.
B)   cells becoming specialized in structure and function.
C)   body parts being shaped and patterned into a specific form.
D)   All of the choices are correct.
E)   None of the choices are correct.F) B) and C)
G) A) and B)

Question 5

Generally, only one sperm fertilizes an egg because

Accepted Answer

A)   sperm are so few that two are unlikely to arrive at the same time.
B)   sperm compete against one another before entering, and only the most fit one is accepted.
C)   one small entry hole called the blastopore allows only one sperm to fit through and then seals.
D)   many sperm enter but only one set of chromosomes can fuse with the egg nucleus; the other sperm are absorbed.
E)   when the first sperm membrane fuses with the egg membrane, it forms a fertilization membrane, which forms a barrier to the penetration of other sperm.F) D) and E)
G) B) and E)

Question 6

Which system develops first in the embryo?

Accepted Answer

A)   reproductive
B)   circulatory
C)   nervous
D)   respiratory
E)   excretoryF) A) and B)
G) B) and D)

Question 7

What statement about homeotic genes, as it relates to morphogenesis inDrosophila , is NOT true?

Accepted Answer

A)   Homeotic genes are found in many different organisms.
B)   Homeotic genes code for translational factors that bind to mRNA.
C)   Each homeotic gene has a variable region and a sequence called the homeobox.
D)   The homeobox codes for a homeodomain which is the DNA-binding portion of the transcriptional factor.
E)   All homeotic genes are thought to be derived from an original DNA sequence that has been highly conserved in evolution.F) C) and D)
G) A) and E)

Question 8

List the correct order of steps in the development of the central nervous system of a vertebrate.

Accepted Answer

a. Neural folds develop on either side o...

Question 9

Which structures located on the oocyte serve to bring the entire sperm into it?

Accepted Answer

A)   microvilli
B)   flagella
C)   zona pellucida
D)   corona radiataE) B) and C)
F) None of the above

Question 10

The human embryo becomes a fetus at the end of the second month of gestation.

Accepted Answer

A) True 
 B)False

Question 11

The neural tube of vertebrates develops during morphogenesis of the nervous system by the

Accepted Answer

A)   folding of ectoderm tissue.
B)   migration of mesoderm cells.
C)   fusion of ectoderm and mesoderm.
D)   contraction of the endoderm away from the mesoderm.
E)   extension of endoderm into a thin spinal column.F) A) and D)
G) None of the above

Question 12

The proper order of embryonic development is

Accepted Answer

A)   cleavage-morula-blastula-gastrula.
B)   morula-cleavage-blastula-gastrula.
C)   blastula-cleavage-morula-gastrula.
D)   gastrula-cleavage-blastula-morula.E) C) and D)
F) None of the above

Question 13

What part of the blastocyst will develop into the human embryo and eventually into a fetus?

Accepted Answer

A)   archenteron
B)   blastopore
C)   chorion
D)   trophoblast
E)   inner cell massF) A) and E)
G) C) and D)

Question 14

Which of the following practices is believed to help the most with slowing the damage accumulation aging process?

Accepted Answer

A)   A diet that consists of dark green vegetables, nuts and red wine.
B)   A diet that has a high level of cholesterol.
C)   A moderate exercise program.
D)   All of these will help slow the aging process.
E)   None of these will help slow the aging process.F) C) and E)
G) None of the above

Exam 42: Animal Development

Which system develops first in the embryo?

Correct Answer
verified

The formation of the lens of the vertebrate eye from a skin layer in contact with an outgrowth of the embryonic brain is an example of

Correct Answer
verified

What statement about homeotic genes, as it relates to morphogenesis inDrosophila , is NOT true?

Correct Answer
verified

Morphogenesis is characterized by

Correct Answer
verified

List the correct order of steps in the development of the central nervous system of a vertebrate.

Correct Answer
verified
a. Neural folds develop on either side o...
View Answer

By the end of the eighth week of development, all organ systems are developed in the embryo.

Correct Answer
verified

The proper order of embryonic development is

Correct Answer
verified

Generally, only one sperm fertilizes an egg because

Correct Answer
verified

The human embryo becomes a fetus at the end of the second month of gestation.

Correct Answer
verified

What part of the blastocyst will develop into the human embryo and eventually into a fetus?

Correct Answer
verified

Which structures located on the oocyte serve to bring the entire sperm into it?

Correct Answer
verified

Which of the following practices is believed to help the most with slowing the damage accumulation aging process?

Correct Answer
verified

The neural tube of vertebrates develops during morphogenesis of the nervous system by the

Correct Answer
verified

Prevention of polyspermy depends upon changes in the plasma membrane of the egg and in the zona pellucida.

Correct Answer
verified

Exam 42: Animal Development

Which system develops first in the embryo?

Correct AnswerverifiedShow Answer

The formation of the lens of the vertebrate eye from a skin layer in contact with an outgrowth of the embryonic brain is an example of

Correct AnswerverifiedShow Answer

What statement about homeotic genes, as it relates to morphogenesis inDrosophila , is NOT true?

Correct AnswerverifiedShow Answer

Morphogenesis is characterized by

Correct AnswerverifiedShow Answer

List the correct order of steps in the development of the central nervous system of a vertebrate.

Correct Answerverifieda. Neural folds develop on either side o...View AnswerShow Answer

By the end of the eighth week of development, all organ systems are developed in the embryo.

Correct AnswerverifiedShow Answer

The proper order of embryonic development is

Correct AnswerverifiedShow Answer

Generally, only one sperm fertilizes an egg because

Correct AnswerverifiedShow Answer

The human embryo becomes a fetus at the end of the second month of gestation.

Correct AnswerverifiedShow Answer

What part of the blastocyst will develop into the human embryo and eventually into a fetus?

Correct AnswerverifiedShow Answer

Which structures located on the oocyte serve to bring the entire sperm into it?

Correct AnswerverifiedShow Answer

Which of the following practices is believed to help the most with slowing the damage accumulation aging process?

Correct AnswerverifiedShow Answer

The neural tube of vertebrates develops during morphogenesis of the nervous system by the

Correct AnswerverifiedShow Answer

Prevention of polyspermy depends upon changes in the plasma membrane of the egg and in the zona pellucida.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. Neural folds develop on either side o...
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

Correct Answer
verified