Question 1

The parceling out of maternal determinants during mitosis is known as

Accepted Answer

A)   homeostasis.
B)   induction.
C)   morphogenesis.
D)   cytoplasmic segregation.
E)   aging.F) B) and C)
G) None of the above

Question 2

Which hormone causes the mammary lobules in the breast to contract, causing milk to flow? Which organ releases the hormone?

Accepted Answer

A)   prolactin; hypothalamus
B)   prolactin; anterior pituitary
C)   oxytocin; hypothalamus
D)   oxytocin; anterior pituitary
E)   estrogen; ovariesF) None of the above
G) A) and B)

Question 3

The egg from a ________ has been observed to form a gray crescent after fertilization.

Accepted Answer

A)   fish
B)   frog
C)   reptile
D)   chicken
E)   humanF) C) and E)
G) A) and D)

Question 4

Which of the following would provide evidence that lifestyle choices can increase the effects of aging?

Accepted Answer

A)   Children of short-lived parents live shorter lives than children of long-lived parents.
B)   Cells only divide for a set number of divisions.
C)   Cell lines become nonfunctional before their maximum number of divisions is reached.
D)   Smoking and excessive alcohol intake are linked to shorter life spans.
E)   Certain genes that code for antioxidant enzymes to detoxify free radicals are present in animals that live longer.F) C) and D)
G) All of the above

Question 5

What is the difference between a skin cell and a stem cell?

Accepted Answer

A)   A skin cell gives rise only to other skin cells and a stem cell gives rise only to stem cells.
B)   A skin cell has a full complement of DNA, but a stem cell does not.
C)   Stem cells have telomerase; skin cells lack telomerase.
D)   Stem cells are not found in humans, while skin cells are.
E)   Stem cells arise from skin cells when select genes are turned on.F) A) and E)
G) A) and C)

Question 6

Describe the steps involved in the fertilization of an egg.

Accepted Answer

Step 1: The sperm makes its way through ...

Question 7

How does a sperm penetrate an egg?

Accepted Answer

A)   Enzymes in the acrosome dissolve the zona pellucida.
B)   The sperm binds to a receptor protein in the membrane and this initiates endocytosis.
C)   The forward pressure of the flagellum forces it through the plasma membrane.
D)   Spermatids are wedge-shaped and are chemically attracted to the inside cytoplasm of the egg cell.
E)   The haploid sets of chromosomes match across the membrane and this triggers the membrane to dissolve.F) A) and D)
G) B) and E)

Question 8

Generally only one sperm fertilizes an egg because

Accepted Answer

A)   sperm compete against one another before entering and only the most fit sperm is able to fertilize the egg.
B)   sperm travel such a great distance that no two sperm are likely to arrive at the same time.
C)   there is only one passageway available for a sperm to enter the egg.
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 fuses with the egg membrane, the membrane depolarizes, which blocks the entry of any other sperm.F) C) and E)
G) All of the above

Question 9

Women are less likely than men to suffer from a heart attack. This is thought to be true because

Accepted Answer

A)   women have less stressful lives than men.
B)   men have testosterone and women do not.
C)   women have estrogen and men do not.
D)   women tend to take better care of their health.
E)   women have a genetic resistance that prevents them from having heart attacks.F) A) and D)
G) A) and E)

Question 10

During which stage of birth is the placenta delivered?

Accepted Answer

A)   third stage
B)   first stage
C)   second stage
D)   fourth stage.
E)   It is done prior to stage one.F) A) and B)
G) A) and C)

Question 11

List and describe the major events during the three stages of birth.

Accepted Answer

Stage 1: The cervical canal disappears a...

Question 12

As we become older, the

Accepted Answer

A)   skin becomes more elastic.
B)   heart decreases in size.
C)   blood vessels become more rigid.
D)   production of gametes continues in both sexes.
E)   liver receives increased blood flow.F) B) and D)
G) B) and C)

Question 13

Which statement is true regarding aging?

Accepted Answer

A)   Genetics may partially determine how long a person lives.
B)   DNA mutations accumulate as the body ages.
C)   Lack of calcium in a person's diet may lead to bone loss.
D)   Some proteins become cross-linked and reduce organ function.
E)   All of the answer choices are true statements about aging.F) A) and B)
G) A) and E)

Question 14

In human development, what is the site of early blood cell formation for the fetus?

Accepted Answer

A)   umbilical cord
B)   placenta
C)   amniotic fluid
D)   yolk sac
E)   allantoisF) C) and D)
G) A) and B)

Question 15

After gastrulation in vertebrates, the blastopore will eventually become the

Accepted Answer

A)   brain.
B)   heart.
C)   mouth.
D)   anus.
E)   ear.F) B) and E)
G) A) and D)

Question 16

During the formation of an embryo, a hollow sphere of cells with a fluid-filled cavity inside is termed a

Accepted Answer

A)   morula.
B)   blastula.
C)   blastocoel.
D)   gastrula.
E)   neurula.F) B) and C)
G) A) and E)

Question 17

When a baby is born, what change(s)  need to occur in fetal circulation for it to survive?

Accepted Answer

A)   The oval opening (foramen ovale)  must close.
B)   The arterial duct must close.
C)   The umbilical arteries and veins close.
D)   Fetal blood must be shunted toward the lungs after tying off the umbilical cord.
E)   All of the answer choices describe changes that need to occur in order for the baby to survive.F) A) and D)
G) C) and D)

Question 18

A homeotic gene codes for a(n)  ________ protein, a sequence of 60 amino acids, sets of which determine the genes to be turned on during development.

Accepted Answer

A)   induction
B)   morphogenesis
C)   growth
D)   regulatory
E)   homeodomainF) C) and E)
G) A) and E)

Question 19

In fetal circulation, which structure allows blood from the right atrium to directly enter the left atrium?

Accepted Answer

A)   umbilical cord
B)   arterial duct
C)   foramen ovale
D)   venous duct
E)   right ventricleF) A) and D)
G) A) and C)

Question 20

During which stage of labor will the cervix be dilated?

Accepted Answer

A)   stage 1
B)   stage 2
C)   stage 3
D)   stage 4
E)   The cervix does not need to dilate for labor.F) A) and D)
G) A) and C)

Exam 22: Development and Aging

The egg from a ________ has been observed to form a gray crescent after fertilization.

Correct AnswerverifiedShow Answer

Which of the following would provide evidence that lifestyle choices can increase the effects of aging?

Correct AnswerverifiedShow Answer

Which statement is true regarding aging?

Correct AnswerverifiedShow Answer

In fetal circulation, which structure allows blood from the right atrium to directly enter the left atrium?

Correct AnswerverifiedShow Answer

A homeotic gene codes for a(n) ________ protein, a sequence of 60 amino acids, sets of which determine the genes to be turned on during development.

Correct AnswerverifiedShow Answer

As we become older, the

Correct AnswerverifiedShow Answer

List and describe the major events during the three stages of birth.

Correct AnswerverifiedStage 1: The cervical canal disappears a...View AnswerShow Answer

In human development, what is the site of early blood cell formation for the fetus?

Correct AnswerverifiedShow Answer

Which hormone causes the mammary lobules in the breast to contract, causing milk to flow? Which organ releases the hormone?

Correct AnswerverifiedShow Answer

How does a sperm penetrate an egg?

Correct AnswerverifiedShow Answer

Generally only one sperm fertilizes an egg because

Correct AnswerverifiedShow Answer

During the formation of an embryo, a hollow sphere of cells with a fluid-filled cavity inside is termed a

Correct AnswerverifiedShow Answer

During which stage of birth is the placenta delivered?

Correct AnswerverifiedShow Answer

The parceling out of maternal determinants during mitosis is known as

Correct AnswerverifiedShow Answer

When a baby is born, what change(s) need to occur in fetal circulation for it to survive?

Correct AnswerverifiedShow Answer

During which stage of labor will the cervix be dilated?

Correct AnswerverifiedShow Answer

Women are less likely than men to suffer from a heart attack. This is thought to be true because

Correct AnswerverifiedShow Answer

What is the difference between a skin cell and a stem cell?

Correct AnswerverifiedShow Answer

Describe the steps involved in the fertilization of an egg.

Correct AnswerverifiedStep 1: The sperm makes its way through ...View AnswerShow Answer

After gastrulation in vertebrates, the blastopore will eventually become the

Correct AnswerverifiedShow Answer

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Stage 1: The cervical canal disappears a...
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Step 1: The sperm makes its way through ...
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Correct Answer
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