Question 1

Cleavage results in daughter cells containing half the number of chromosomes of the parent cell.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is not a known benefit of regular exercise?

Accepted Answer

A)  Maintained joint mobility
B)  Maintained strength
C)  Decreased incidence of hypertension
D)  Maintained endurance
E)  Prolonged life expectancyF) A) and E)
G) B) and D)

Question 3

In the fast block to polyspermy,binding of sperm opens up __________ channels,which depolarizes the egg membrane and __________.

Accepted Answer

A)  Na+; prevents the entrance of any more sperm
B)  Na+; prevents the entrance of more Na+
C)  Na+; prevents the entrance of Ca2+
D)  Ca2+; prevents the entrance of any more sperm
E)  Ca2+; prevents the entrance of more Na+F) B) and D)
G) A) and D)

Question 4

The chorion forms the fetal part of the placenta.

Accepted Answer

A) True 
 B)False

Question 5

The spheroidal stage of early prenatal development with about 16 to 64 cells is called a(n) __________.

Accepted Answer

A)  zygote
B)  embryo
C)  blastomere
D)  morula
E)  blastocystF) B) and D)
G) B) and C)

Question 6

By the time the conceptus arrives in the uterus,it consists of at least __________ or more cells.

Accepted Answer

A)  2
B)  4
C)  8
D)  16
E)  32F) C) and D)
G) B) and D)

Question 7

A person in his or her 90's can increase muscle strength by two or three times with 40 minutes of isometric exercise per week.

Accepted Answer

A) True 
 B)False

Question 8

The __________ is an embryonic membrane that serves as the origin of the first blood and germ cells.

Accepted Answer

A)  yolk sac
B)  allantois
C)  chorion
D)  amnion
E)  placentaF) A) and D)
G) A) and E)

Question 9

The placenta begins to form after week 8.

Accepted Answer

A) True 
 B)False

Question 10

Senescence of the immune system makes older people more susceptible to cancer and infectious disease because of a decline in __________.

Accepted Answer

A)  alpha and beta globulins
B)  red blood cells and platelets
C)  complement proteins
D)  prothrombin and fibrinogen
E)  antigen-presenting cells and helper T cellsF) C) and E)
G) A) and C)

Question 11

Which of the following systems shows the least overall senescence?

Accepted Answer

A)  Muscular system
B)  Endocrine system
C)  Integumentary system
D)  Reproductive system
E)  Urinary systemF) C) and D)
G) A) and B)

Question 12

The embryonic stage extends from 16 days through the end of week 8.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following does not have potentially teratogenic effects?

Accepted Answer

A)  Smoking
B)  Alcohol
C)  Infectious diseases
D)  Sunlight
E)  X-raysF) B) and C)
G) A) and B)

Question 14

During birth,an infant is normally stimulated to breathe by __________.

Accepted Answer

A)  CO2 accumulating in the baby's blood
B)  an increased O2 level in the baby's new environment
C)  prostaglandins
D)  surfactant
E)  being spanked by the doctorF) A) and B)
G) C) and D)

Question 15

Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.

Accepted Answer

A) True 
 B)False

Question 16

Twins produced when a single egg is fertilized are called __________ twins.Twins produced from two eggs ovulated at the same time are called __________ twins.

Accepted Answer

A)  monozygotic; identical
B)  dizygotic; nonidentical
C)  monozygotic; dizygotic
D)  dizygotic; monozygotic
E)  nonidentical; identicalF) A) and E)
G) C) and D)

Question 17

Which of the following statements is true regarding telomeres?

Accepted Answer

A)  Telomeres are cytoplasmic enzymes involved in senescence.
B)  Telomeres are antioxidants that slow the progress of senescence.
C)  Telomeres are DNA segments at each end of a chromosome.
D)  Telomeres are proteins that cap the ends of the chromosomes.
E)  Telomeres are motor molecules that guide embryonic cells to the right destinations.F) A) and D)
G) B) and E)

Question 18

__________ pass(es) from the maternal blood to the fetal blood.Fetal __________ pass(es) the other way.

Accepted Answer

A)  Carbon dioxide and oxygen; wastes
B)  Carbon dioxide; nutrients
C)  Wastes; nutrients and oxygen
D)  Wastes and nutrients; oxygen and carbon dioxide
E)  Oxygen and nutrients; wastesF) B) and C)
G) A) and B)

Question 19

To some extent,the heat loss of the neonate is compensated for by the thermal insulation provided by brown fat.

Accepted Answer

A) True 
 B)False

Question 20

Down syndrome (trisomy-21) results from _________.

Accepted Answer

A)  a mutagen
B)  nondisjunction
C)  a teratogen
D)  a sex-linked mutation
E)  an autosomal recessive alleleF) All of the above
G) A) and D)

Exam 29: Human Development and Aging

__________ pass(es) from the maternal blood to the fetal blood.Fetal __________ pass(es) the other way.

Correct AnswerverifiedShow Answer

To some extent,the heat loss of the neonate is compensated for by the thermal insulation provided by brown fat.

Correct AnswerverifiedShow Answer

Which of the following is not a known benefit of regular exercise?

Correct AnswerverifiedShow Answer

During birth,an infant is normally stimulated to breathe by __________.

Correct AnswerverifiedShow Answer

Twins produced when a single egg is fertilized are called __________ twins.Twins produced from two eggs ovulated at the same time are called __________ twins.

Correct AnswerverifiedShow Answer

Which of the following does not have potentially teratogenic effects?

Correct AnswerverifiedShow Answer

The embryonic stage extends from 16 days through the end of week 8.

Correct AnswerverifiedShow Answer

Senescence of the immune system makes older people more susceptible to cancer and infectious disease because of a decline in __________.

Correct AnswerverifiedShow Answer

Cleavage results in daughter cells containing half the number of chromosomes of the parent cell.

Correct AnswerverifiedShow Answer

In the fast block to polyspermy,binding of sperm opens up __________ channels,which depolarizes the egg membrane and __________.

Correct AnswerverifiedShow Answer

By the time the conceptus arrives in the uterus,it consists of at least __________ or more cells.

Correct AnswerverifiedShow Answer

The chorion forms the fetal part of the placenta.

Correct AnswerverifiedShow Answer

The __________ is an embryonic membrane that serves as the origin of the first blood and germ cells.

Correct AnswerverifiedShow Answer

Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.

Correct AnswerverifiedShow Answer

The spheroidal stage of early prenatal development with about 16 to 64 cells is called a(n) __________.

Correct AnswerverifiedShow Answer

Which of the following systems shows the least overall senescence?

Correct AnswerverifiedShow Answer

Which of the following statements is true regarding telomeres?

Correct AnswerverifiedShow Answer

Down syndrome (trisomy-21) results from _________.

Correct AnswerverifiedShow Answer

A person in his or her 90's can increase muscle strength by two or three times with 40 minutes of isometric exercise per week.

Correct AnswerverifiedShow Answer

The placenta begins to form after week 8.

Correct AnswerverifiedShow Answer

pass(es) from the maternal blood to the fetal blood.Fetal pass(es) the other way.

Correct Answer
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Twins produced when a single egg is fertilized are called twins.Twins produced from two eggs ovulated at the same time are called twins.

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In the fast block to polyspermy,binding of sperm opens up channels,which depolarizes the egg membrane and .

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