Question 1

During which stage of birth is the placenta delivered?

Accepted Answer

A)   third stage
B)   first stage
C)   second stage
D)   it is done prior to stage one
E)   it is done after the third stageF) A) and D)
G) D) and E)

Question 2

The _____ is responsible for gas-exchange in the egg of a chicken.

Accepted Answer

A)   yolk sac
B)   amnion
C)   embryo
D)   umbilical cord
E)   chorionF) A) and B)
G) B) and C)

Question 3

The afterbirth refers to the

Accepted Answer

A)   expulsion of the placenta and membranes.
B)   expulsion of the uterine lining.
C)   expulsion of the amniotic membrane.
D)   expulsion of the fetus.
E)   period of time from birth to nursing.F) A) and D)
G) A) and E)

Question 4

Genes that determine how segments develop during morphogenesis are termed ____ genes.

Accepted Answer

A)   induction
B)   cleavage
C)   differentiation
D)   homeotic
E)   home aloneF) A) and C)
G) B) and C)

Question 5

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 B)
G) B) and D)

Question 6

Which of the following is an advantage of breast feeding?

Accepted Answer

A)   All of these are advantages of breast feeding.
B)   Colostrum is rich in proteins and antibodies.
C)   Physiological benefits for the mother.
D)   Suckling causes uterine contractions that help reduce the uterus to its normal size.
E)   Breast feeding uses up calories that can help a woman return to her normal weight.F) C) and D)
G) All of the above

Question 7

From months 5 to 7,a fetus is covered in a fine down called

Accepted Answer

A)   chorion.
B)   pubescence.
C)   lanugo.
D)   vernosa.
E)   afterbirth.F) C) and D)
G) B) and E)

Question 8

The _____ develops into the fetal portion of the placenta.

Accepted Answer

A)   amnion
B)   archenteron
C)   chorion
D)   yolk sac
E)   allantoisF) C) and D)
G) B) and D)

Question 9

As we become older,the

Accepted Answer

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

Question 10

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 rise gives rise only to stems.
B)   A skin cell has a full complement of DNA but a skin cell does not.
C)   Specific genes are turned on in skin cells while stem cells still have all of their genes turned on.
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) B) and C)
G) B) and D)

Question 11

The hormone ____ from the ____ causes mammary lobules in the breast to contract causing milk to flow.

Accepted Answer

A)   prolactin; hypothalamus
B)   prolactin; anterior pituitary
C)   oxytocin; hypothalamus
D)   oxytocin; anterior pituitary
E)   estrogen; ovariesF) D) and E)
G) A) and B)

Question 12

The statement 'a child is more closely related to its mother than to its father' is

Accepted Answer

A)   not true because there is an equal contribution from both parents.
B)   true because the egg contains more than just DNA and the sperm only contributes DNA.
C)   not true because the egg only contributes DNA while the sperm contributes enzymes from the acrosome and mitochondria.
D)   true because the mother's blood flows into the umbilical cord and therefore the baby shares the mother's blood.
E)   true because it is possible for a woman to become pregnant without the sperm.F) B) and E)
G) A) and B)

Question 13

Which association is incorrect?

Accepted Answer

A)   chorion-gas exchange
B)   amnion-blood vessels
C)   allantois-waste storage
D)   yolk sac-food storage
E)   yolk-nourishmentF) B) and D)
G) B) and C)

Question 14

The blastocoel is formed during the _____ stage of development.

Accepted Answer

A)   morula
B)   blastula
C)   gastrula
D)   zygote
E)   neurulaF) C) and E)
G) A) and D)

Question 15

Describe the 6 steps involved in fertilization of an egg,starting with the sperm reaching the egg.

Accepted Answer

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

Question 16

List the three embryonic germ layers and indicate a structure that forms from each.

Accepted Answer

Ectoderm layer: nervous system,epidermis...

Question 17

In experiments with the roundworm Caenorhabditis elegans,researchers were able to trace the development of the generalized zygote into the specialized cells of the adult roundworm,a schematic that formed a(n)

Accepted Answer

A)   homeobox.
B)   pattern formation.
C)   cytoplasmic segregation.
D)   induction.
E)   fate map.F) A) and C)
G) All of the above

Question 18

The human blastocyst

Accepted Answer

A)   gives rise to umbilical blood vessels.
B)   contains a fluid-filled central cavity.
C)   is the expanded end of the gastrula.
D)   has three germ layers.
E)   is the fertilized egg.F) A) and E)
G) C) and D)

Question 19

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 D)
G) B) and E)

Question 20

Generally only one sperm fertilizes an egg because

Accepted Answer

A)   sperm compete against one another before entering and only the most fit one is accepted.
B)   sperm are so few that two are unlikely to arrive at the same time.
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 fuses with the egg membrane, it causes the membrane to depolarize and also separates the fertilization membrane and this gap forms a barrier to any other sperm.F) B) and E)
G) A) and D)

Exam 22: Development and Aging

The afterbirth refers to the

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The blastocoel is formed during the _____ stage of development.

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Which of the following is an advantage of breast feeding?

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Generally only one sperm fertilizes an egg because

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Genes that determine how segments develop during morphogenesis are termed ____ genes.

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From months 5 to 7,a fetus is covered in a fine down called

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The human blastocyst

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Describe the 6 steps involved in fertilization of an egg,starting with the sperm reaching the egg.

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

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

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The _____ develops into the fetal portion of the placenta.

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

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As we become older,the

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The _____ is responsible for gas-exchange in the egg of a chicken.

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In experiments with the roundworm Caenorhabditis elegans,researchers were able to trace the development of the generalized zygote into the specialized cells of the adult roundworm,a schematic that formed a(n)

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Which association is incorrect?

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

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The statement 'a child is more closely related to its mother than to its father' is

Correct AnswerverifiedShow Answer

List the three embryonic germ layers and indicate a structure that forms from each.

Correct AnswerverifiedEctoderm layer: nervous system,epidermis...View AnswerShow Answer

During which stage of birth is the placenta delivered?

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The hormone ____ from the ____ causes mammary lobules in the breast to contract causing milk to flow.

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Step 1: the sperm makes its way through ...
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Ectoderm layer: nervous system,epidermis...
View Answer

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The hormone from the causes mammary lobules in the breast to contract causing milk to flow.

Correct Answer
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