Question 1

The primary germ layers include all of following EXCEPT

Accepted Answer

A)  endoderm 
B)  ectoderm 
C)  mesoderm 
D)  morphogerm 
E)  all of the above ARE primary germ layers 
A)  endoderm 
B)  ectoderm 
C)  mesoderm 
D)  morphogerm 
E)  all of the above ARE primary germ layers

Question 2

One possible reason for a "senior moment" might be

Accepted Answer

A)  loss of neurotransmitter. 
B)  demyelination of CNS neurons causing slower conduction of impulses. 
C)  toxins building up in the brain over the years. 
D)  slower release of neurotransmitters. 
E)  both b and d. 
A)  loss of neurotransmitter. 
B)  demyelination of CNS neurons causing slower conduction of impulses. 
C)  toxins building up in the brain over the years. 
D)  slower release of neurotransmitters. 
E)  both b and d.

Question 3

At about how many weeks of pregnancy is an amniocentesis performed?

Accepted Answer

A)  5 - 7 weeks 
B)  10 - 12 weeks 
C)  14 - 16 weeks 
D)  18 - 20 weeks 
E)  21 - 24 weeks 
A)  5 - 7 weeks 
B)  10 - 12 weeks 
C)  14 - 16 weeks 
D)  18 - 20 weeks 
E)  21 - 24 weeks

Question 4

Chorionic villi contain

Accepted Answer

A)  germ cells. 
B)  lymphatic vessels. 
C)  endometrial cells. 
D)  blood vessels. 
E)  the allantois. 
A)  germ cells. 
B)  lymphatic vessels. 
C)  endometrial cells. 
D)  blood vessels. 
E)  the allantois.

Question 5

Which hormones stimulate the growth of mammary glands during pregnancy?

Accepted Answer

A)  oxytocin and prolactin 
B)  somatotropin and oxytocin 
C)  prolactin and somatotropin 
D)  estrogen and progesterone 
E)  estrogen and oxytocin 
A)  oxytocin and prolactin 
B)  somatotropin and oxytocin 
C)  prolactin and somatotropin 
D)  estrogen and progesterone 
E)  estrogen and oxytocin

Question 6

The primitive streak will develop directly into the

Accepted Answer

A)  neural tube. 
B)  embryonic disk. 
C)  pharyngeal arches. 
D)  somites. 
E)  coelom. 
A)  neural tube. 
B)  embryonic disk. 
C)  pharyngeal arches. 
D)  somites. 
E)  coelom.

Question 7

An embryo with two X chromosomes will develop female characters because of

Accepted Answer

A)  the presence of female hormones in development. 
B)  the absence of testosterone during early embryology. 
C)  the SRY regions of the X chromosomes. 
D)  maternal substances passed to the zygote during fertilization. 
E)  human chorionic gonadotropin. 
A)  the presence of female hormones in development. 
B)  the absence of testosterone during early embryology. 
C)  the SRY regions of the X chromosomes. 
D)  maternal substances passed to the zygote during fertilization. 
E)  human chorionic gonadotropin.

Question 8

Exposure to which of the following would cause a newborn to experience improper nervous system development, chronic irritability, oxygen deprivation, and long-term emotional problems?

Accepted Answer

A)  cocaine or crack 
B)  Retin-A 
C)  thalidomide 
D)  streptomycin 
E)  alcohol 
A)  cocaine or crack 
B)  Retin-A 
C)  thalidomide 
D)  streptomycin 
E)  alcohol

Question 9

Apoptosis

Accepted Answer

A)  leads to formation of the gut cavity. 
B)  separates the digits when fingers form. 
C)  occurs among somites. 
D)  only occurs in humans. 
E)  occurs only during gastrulation. 
A)  leads to formation of the gut cavity. 
B)  separates the digits when fingers form. 
C)  occurs among somites. 
D)  only occurs in humans. 
E)  occurs only during gastrulation.

Question 10

A seven month fetus will have difficulty surviving outside of the mother because

Accepted Answer

A)  it will have difficulty breathing and regulating body temperature. 
B)  it is unable to suck and drink milk. 
C)  its skin is not fully developed. 
D)  its heart is not fully developed. 
E)  the nervous system is too immature to keep the baby alive. 
A)  it will have difficulty breathing and regulating body temperature. 
B)  it is unable to suck and drink milk. 
C)  its skin is not fully developed. 
D)  its heart is not fully developed. 
E)  the nervous system is too immature to keep the baby alive.

Question 11

Selecting the Exception Four of the five answers listed below are related by a matching feature. Select the exception.

Accepted Answer

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

Question 12

In which stage of labor is the afterbirth (placenta, fluid, and blood) delivered?

Accepted Answer

A)  the first stage 
B)  the second stage 
C)  the third stage 
D)  in either the first or second stage 
E)  in either the second or third stage 
A)  the first stage 
B)  the second stage 
C)  the third stage 
D)  in either the first or second stage 
E)  in either the second or third stage

Question 13

Fraternal twins arise from

Accepted Answer

A)  fertilization of two eggs by two sperm. 
B)  fertilization of two eggs by one sperm. 
C)  a split of the morula. 
D)  a split of the blastomere. 
E)  cleavage of the zygote. 
A)  fertilization of two eggs by two sperm. 
B)  fertilization of two eggs by one sperm. 
C)  a split of the morula. 
D)  a split of the blastomere. 
E)  cleavage of the zygote.

Question 14

Somites arise from

Accepted Answer

A)  endoderm. 
B)  mesoderm. 
C)  ectoderm. 
D)  gastroderm. 
E)  placoderm. 
A)  endoderm. 
B)  mesoderm. 
C)  ectoderm. 
D)  gastroderm. 
E)  placoderm.

Question 15

The first stage in the development of the nervous system is

Accepted Answer

A)  gastrulation. 
B)  blastulation. 
C)  neurulation. 
D)  morulation. 
E)  festination. 
A)  gastrulation. 
B)  blastulation. 
C)  neurulation. 
D)  morulation. 
E)  festination.

Question 16

The soft, fuzzy hair covering the body of a fetus in the second trimester is called

Accepted Answer

A)  vernix caseosa. 
B)  fossa ovalis. 
C)  chorionic villus. 
D)  lanugo. 
E)  colostrum. 
A)  vernix caseosa. 
B)  fossa ovalis. 
C)  chorionic villus. 
D)  lanugo. 
E)  colostrum.

Question 17

Which hormone prevents the endometrium from breaking down until the placenta secretes enough hormones to maintain it?

Accepted Answer

A)  hGH 
B)  FSH 
C)  estrogen 
D)  hCG 
E)  ADH 
A)  hGH 
B)  FSH 
C)  estrogen 
D)  hCG 
E)  ADH

Question 18

Which of the following is NOT true concerning umbilical arteries?

Accepted Answer

A)  There are two of them. 
B)  They carry oxygen-poor blood. 
C)  They take blood from the fetus to the placenta. 
D)  They are housed in the umbilical cord. 
E)  They carry blood that is rich in nutrients. 
A)  There are two of them. 
B)  They carry oxygen-poor blood. 
C)  They take blood from the fetus to the placenta. 
D)  They are housed in the umbilical cord. 
E)  They carry blood that is rich in nutrients.

Question 19

Age-related changes in systems other than the nervous system include

Accepted Answer

A)  a decrease in the size of the heart. 
B)  a break down of alveolar walls in the lungs. 
C)  the buildup of cholesterol plaques in blood vessels. 
D)  a decrease in blood transport to organs. 
E)  all of these. 
A)  a decrease in the size of the heart. 
B)  a break down of alveolar walls in the lungs. 
C)  the buildup of cholesterol plaques in blood vessels. 
D)  a decrease in blood transport to organs. 
E)  all of these.

Question 20

All of the following are usually a part of the aging of reproductive systems EXCEPT

Accepted Answer

A)  declining levels of estrogen. 
B)  menopause. 
C)  loss of sexual response. 
D)  decreased fertility. 
E)  declining testosterone levels. 
A)  declining levels of estrogen. 
B)  menopause. 
C)  loss of sexual response. 
D)  decreased fertility. 
E)  declining testosterone levels.

Exam 17: Development and Aging

The primary germ layers include all of following EXCEPT

One possible reason for a "senior moment" might be

At about how many weeks of pregnancy is an amniocentesis performed?

Chorionic villi contain

Which hormones stimulate the growth of mammary glands during pregnancy?

The primitive streak will develop directly into the

An embryo with two X chromosomes will develop female characters because of

Exposure to which of the following would cause a newborn to experience improper nervous system development, chronic irritability, oxygen deprivation, and long-term emotional problems?

Apoptosis

A seven month fetus will have difficulty surviving outside of the mother because

Selecting the Exception Four of the five answers listed below are related by a matching feature. Select the exception.

In which stage of labor is the afterbirth (placenta, fluid, and blood) delivered?

Fraternal twins arise from

Somites arise from

The first stage in the development of the nervous system is

The soft, fuzzy hair covering the body of a fetus in the second trimester is called

Which hormone prevents the endometrium from breaking down until the placenta secretes enough hormones to maintain it?

Which of the following is NOT true concerning umbilical arteries?

Age-related changes in systems other than the nervous system include

All of the following are usually a part of the aging of reproductive systems EXCEPT

Learning About Human Biology

Chemistry of Life

Cells and How They Work

Tissues, Organs, and Organ Systems

The Skeletal System

The Muscular System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Cell Reproduction

Introduction to Genetics

Chromosomes and Human Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Principles of Ecology

Human Impacts on the Biosphere

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