Question 1

Which statement is true?

Accepted Answer

A)  Viviparity is universal in mammals. 
B)  Most modern male birds use an erectile penis to deliver sperm to the female's reproductive tract. 
C)  Amniote eggs survive equally well in water and on land. 
D)  Hemipenes occur in male snakes and lizards. 
E)  All reptiles are oviparous. 
A)  Viviparity is universal in mammals. 
B)  Most modern male birds use an erectile penis to deliver sperm to the female's reproductive tract. 
C)  Amniote eggs survive equally well in water and on land. 
D)  Hemipenes occur in male snakes and lizards. 
E)  All reptiles are oviparous.

Question 2

Sexual reproduction has an evolutionary advantage over asexual reproduction because it

Accepted Answer

A)  results in both males and females of a species. 
B)  is a more lengthy process. 
C)  promotes genetic variability that potentially enables a population to adapt to a change in the environment. 
D)  is controlled by many hormonal mechanisms. 
E)  protects and nurtures the embryo. 
A)  results in both males and females of a species. 
B)  is a more lengthy process. 
C)  promotes genetic variability that potentially enables a population to adapt to a change in the environment. 
D)  is controlled by many hormonal mechanisms. 
E)  protects and nurtures the embryo.

Question 3

The acrosomal reaction in sea urchins

Accepted Answer

A)  triggers the polymerization of bindin. 
B)  digests a path through the jelly coat. 
C)  triggers activation of the egg. 
D)  causes sodium ions to move through the cell membrane into the egg. 
E)  occurs when sperm contact the cell membrane of the egg. 
A)  triggers the polymerization of bindin. 
B)  digests a path through the jelly coat. 
C)  triggers activation of the egg. 
D)  causes sodium ions to move through the cell membrane into the egg. 
E)  occurs when sperm contact the cell membrane of the egg.

Question 4

A complete blockage in the vas deferens at the end closest to the testis would cause newly matured sperm to remain in the

Accepted Answer

A)  seminiferous tubules. 
B)  urethra. 
C)  lumens of the seminiferous tubules. 
D)  epididymis. 
E)  vas deferens. 
A)  seminiferous tubules. 
B)  urethra. 
C)  lumens of the seminiferous tubules. 
D)  epididymis. 
E)  vas deferens.

Question 5

Which statement about sexual reproduction is true?

Accepted Answer

A)  Humans are monoecious. 
B)  Earthworms are simultaneous hermaphrodites. 
C)  Self-fertilization is common among simultaneous hermaphrodites. 
D)  Anemone fish are simultaneous hermaphrodites. 
E)  Earthworms are dioecious. 
A)  Humans are monoecious. 
B)  Earthworms are simultaneous hermaphrodites. 
C)  Self-fertilization is common among simultaneous hermaphrodites. 
D)  Anemone fish are simultaneous hermaphrodites. 
E)  Earthworms are dioecious.

Question 6

Budding and regeneration have which feature in common?

Accepted Answer

A)  Cells of the new individual differentiate before breaking away from the parent. 
B)  New individuals are produced via mitosis. 
C)  External forces are required to break the new individual away from the parent. 
D)  New individuals form from a piece that has broken off from the parent. 
E)  They are found only in simple multicellular animals. 
A)  Cells of the new individual differentiate before breaking away from the parent. 
B)  New individuals are produced via mitosis. 
C)  External forces are required to break the new individual away from the parent. 
D)  New individuals form from a piece that has broken off from the parent. 
E)  They are found only in simple multicellular animals.

Question 7

In women, a drug that blocks the LH surge would most immediately prevent

Accepted Answer

A)  a peak in estrogen. 
B)  ovulation. 
C)  a peak in progesterone. 
D)  implantation of a fertilized egg. 
E)  degeneration of the corpus luteum. 
A)  a peak in estrogen. 
B)  ovulation. 
C)  a peak in progesterone. 
D)  implantation of a fertilized egg. 
E)  degeneration of the corpus luteum.

Question 8

Which event occurs prior to the others during a penile erection?

Accepted Answer

A)  Increase in the second messenger cGMP in smooth muscle cells of blood vessels 
B)  Erectile tissue fills with blood 
C)  Release of nitric oxide, which affects the blood vessels entering the penis 
D)  Compression of vessels that carry blood away from the penis 
E)  Dilation of blood vessels entering the penis 
A)  Increase in the second messenger cGMP in smooth muscle cells of blood vessels 
B)  Erectile tissue fills with blood 
C)  Release of nitric oxide, which affects the blood vessels entering the penis 
D)  Compression of vessels that carry blood away from the penis 
E)  Dilation of blood vessels entering the penis

Question 9

Refer to the figure showing the human female reproductive system.   Based on the figure, which statement is true?

Accepted Answer

A)  The structure at point 1 is covered by a diaphragm, placed immediately below it, as a form of birth control. 
B)  The structure at point 8 is tied off during female sterilization. 
C)  Progesterone receptors in the structure at point 4 are blocked by Mifepristone (RU-486). 
D)  Spermicidal jelly is applied to the structure at point 4. 
E)  The cycle of the structure at point 3 is stopped by combination estrogen and progesterone birth control pills. 
A)  The structure at point 1 is covered by a diaphragm, placed immediately below it, as a form of birth control. 
B)  The structure at point 8 is tied off during female sterilization. 
C)  Progesterone receptors in the structure at point 4 are blocked by Mifepristone (RU-486). 
D)  Spermicidal jelly is applied to the structure at point 4. 
E)  The cycle of the structure at point 3 is stopped by combination estrogen and progesterone birth control pills.

Question 10

The enzyme-containing cap at the front of the head of a sperm is called the _______.

Accepted Answer

The answer of The enzyme-containing cap at the front of...

Question 11

Which statement about human reproductive systems is true?

Accepted Answer

A)  Seminal fluid contains fructose, which provides energy to sperm. 
B)  By volume, the prostate gland contributes the most to semen. 
C)  The urethra serves as the common final duct for the urinary and reproductive systems in males and females. 
D)  The prostate gland surrounds the ureter, just above the urinary bladder. 
E)  Thickness of skin increases from the shaft of the penis to the glans penis. 
A)  Seminal fluid contains fructose, which provides energy to sperm. 
B)  By volume, the prostate gland contributes the most to semen. 
C)  The urethra serves as the common final duct for the urinary and reproductive systems in males and females. 
D)  The prostate gland surrounds the ureter, just above the urinary bladder. 
E)  Thickness of skin increases from the shaft of the penis to the glans penis.

Question 12

Which statement about gametogenesis in males is true?

Accepted Answer

A)  Spermatogenesis is the process by which a spermatid develops into a sperm. 
B)  In humans, spermatogonia stop dividing by mitosis at puberty. 
C)  The first meiotic division in spermatogenesis produces haploid cells, as does the second meiotic division. 
D)  Secondary spermatocytes each contain a Y chromosome. 
E)  Each secondary spermatocyte produces four haploid spermatids. 
A)  Spermatogenesis is the process by which a spermatid develops into a sperm. 
B)  In humans, spermatogonia stop dividing by mitosis at puberty. 
C)  The first meiotic division in spermatogenesis produces haploid cells, as does the second meiotic division. 
D)  Secondary spermatocytes each contain a Y chromosome. 
E)  Each secondary spermatocyte produces four haploid spermatids.

Question 13

The sexual role assumed during courtship by an individual of the parthenogenetic whiptail lizard species Cnemidophorus uniparens

Accepted Answer

A)  depends on its testosterone levels. 
B)  determines whether it will produce sperm. 
C)  depends on its current stage in the ovarian cycle. 
D)  determines whether it will fertilize its mate's eggs. 
E)  is determined at birth. 
A)  depends on its testosterone levels. 
B)  determines whether it will produce sperm. 
C)  depends on its current stage in the ovarian cycle. 
D)  determines whether it will fertilize its mate's eggs. 
E)  is determined at birth.

Question 14

Which statement about reproduction is true?

Accepted Answer

A)  Asexual reproduction involves an inefficient use of resources. 
B)  Sexually reproducing species are found almost exclusively in relatively constant environments where genetic diversity is relatively unimportant. 
C)  Because it is produced by meiosis, a bud is genetically different from the parent. 
D)  Only lost limbs can be replaced by regeneration. 
E)  In some species, parthenogenesis requires all the sexual behaviors of courtship and mating. 
A)  Asexual reproduction involves an inefficient use of resources. 
B)  Sexually reproducing species are found almost exclusively in relatively constant environments where genetic diversity is relatively unimportant. 
C)  Because it is produced by meiosis, a bud is genetically different from the parent. 
D)  Only lost limbs can be replaced by regeneration. 
E)  In some species, parthenogenesis requires all the sexual behaviors of courtship and mating.

Question 15

Which statement about abortion is true?

Accepted Answer

A)  Spontaneous abortions are induced through medical intervention. 
B)  Once an egg has been fertilized, any termination of pregnancy is called an abortion. 
C)  Therapeutic abortions are medically induced and may be performed to save the life of the mother. 
D)  Spontaneous abortions are rare. 
E)  Only a few spontaneous abortions occur prior to the woman realizing she is pregnant. 
A)  Spontaneous abortions are induced through medical intervention. 
B)  Once an egg has been fertilized, any termination of pregnancy is called an abortion. 
C)  Therapeutic abortions are medically induced and may be performed to save the life of the mother. 
D)  Spontaneous abortions are rare. 
E)  Only a few spontaneous abortions occur prior to the woman realizing she is pregnant.

Question 16

The fast block to polyspermy in sea urchins

Accepted Answer

A)  results from an influx of sodium ions across the egg's plasma membrane. 
B)  occurs after the slow block to polyspermy. 
C)  results from an influx of sodium ions across the sperm's plasma membrane. 
D)  prompts the acrosomal process to form. 
E)  results from release of calcium ions by the endoplasmic reticulum. 
A)  results from an influx of sodium ions across the egg's plasma membrane. 
B)  occurs after the slow block to polyspermy. 
C)  results from an influx of sodium ions across the sperm's plasma membrane. 
D)  prompts the acrosomal process to form. 
E)  results from release of calcium ions by the endoplasmic reticulum.

Question 17

Which cells are produced from mitotic divisions of spermatogonia but are no longer mitotic themselves?

Accepted Answer

A)  Sperm 
B)  Spermatogonia 
C)  Spermatids 
D)  Primary spermatocytes 
E)  Secondary spermatocytes 
A)  Sperm 
B)  Spermatogonia 
C)  Spermatids 
D)  Primary spermatocytes 
E)  Secondary spermatocytes

Question 18

You are studying a group of blue-headed wrasse and mark individuals to keep track of their development.One day you notice that a female you had marked when it was young has changed its coloration and is behaving like a male.What is a likely explanation for this?

Accepted Answer

A)  The female is being influenced by the testosterone produced by the male fish in the tank. 
B)  The female has stopped producing sex hormones. 
C)  The fish is dioecious and a sequential hermaphrodite. 
D)  The fish is a simultaneous hermaphrodite. 
E)  The fish is monoecious, and its gonads are now producing sperm. 
A)  The female is being influenced by the testosterone produced by the male fish in the tank. 
B)  The female has stopped producing sex hormones. 
C)  The fish is dioecious and a sequential hermaphrodite. 
D)  The fish is a simultaneous hermaphrodite. 
E)  The fish is monoecious, and its gonads are now producing sperm.

Question 19

Vasectomy

Accepted Answer

A)  prevents sperm from reaching the urethra. 
B)  stops sperm production. 
C)  reduces testosterone levels. 
D)  reduces sexual responses. 
E)  causes impotence. 
A)  prevents sperm from reaching the urethra. 
B)  stops sperm production. 
C)  reduces testosterone levels. 
D)  reduces sexual responses. 
E)  causes impotence.

Question 20

Which event occurs during fertilization in both sea urchins and mammals?

Accepted Answer

A)  Endoplasmic reticulum releases calcium into the egg cytoplasm 
B)  Egg's outer jelly triggers the acrosomal reaction in the sperm 
C)  Formation of fertilization envelope 
D)  Sperm entry triggers rapid change in egg's membrane potential 
E)  Egg and sperm meet in the external environment 
A)  Endoplasmic reticulum releases calcium into the egg cytoplasm 
B)  Egg's outer jelly triggers the acrosomal reaction in the sperm 
C)  Formation of fertilization envelope 
D)  Sperm entry triggers rapid change in egg's membrane potential 
E)  Egg and sperm meet in the external environment

Exam 42: Animal Reproduction

Which statement is true?

Sexual reproduction has an evolutionary advantage over asexual reproduction because it

The acrosomal reaction in sea urchins

A complete blockage in the vas deferens at the end closest to the testis would cause newly matured sperm to remain in the

Which statement about sexual reproduction is true?

Budding and regeneration have which feature in common?

In women, a drug that blocks the LH surge would most immediately prevent

Which event occurs prior to the others during a penile erection?

Refer to the figure showing the human female reproductive system. Based on the figure, which statement is true?

The enzyme-containing cap at the front of the head of a sperm is called the _______.

Which statement about human reproductive systems is true?

Which statement about gametogenesis in males is true?

The sexual role assumed during courtship by an individual of the parthenogenetic whiptail lizard species Cnemidophorus uniparens

Which statement about reproduction is true?

Which statement about abortion is true?

The fast block to polyspermy in sea urchins

Which cells are produced from mitotic divisions of spermatogonia but are no longer mitotic themselves?

You are studying a group of blue-headed wrasse and mark individuals to keep track of their development.One day you notice that a female you had marked when it was young has changed its coloration and is behaving like a male.What is a likely explanation for this?

Vasectomy

Which event occurs during fertilization in both sea urchins and mammals?

Studying Life

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Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

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Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

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From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

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Mechanisms of Evolution

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Plants Without Seeds: From Water to Land

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