Question 1

In mammals,if the egg is not fertilized following ovulation,the follicle cells of the corpus luteum

Accepted Answer

A)  degenerate. 
B)  move with the egg into the oviduct. 
C)  develop an antrum. 
D)  start secreting LH. 
E)  begin to develop a new egg. 
A)  degenerate. 
B)  move with the egg into the oviduct. 
C)  develop an antrum. 
D)  start secreting LH. 
E)  begin to develop a new egg. A

Question 2

Which statement about blocks to polyspermy in sea urchins is false?

Accepted Answer

A)  The fast block causes release of the acrosomal enzymes. 
B)  Blocks to polyspermy prevent more than one sperm from entering an egg. 
C)  The fast block occurs before the slow block. 
D)  Blocks to polyspermy are triggered by fusion of the plasma membranes of the sperm and egg. 
E)  The slow block to polyspermy takes about a minute to be put into place. 
A)  The fast block causes release of the acrosomal enzymes. 
B)  Blocks to polyspermy prevent more than one sperm from entering an egg. 
C)  The fast block occurs before the slow block. 
D)  Blocks to polyspermy are triggered by fusion of the plasma membranes of the sperm and egg. 
E)  The slow block to polyspermy takes about a minute to be put into place. A

Question 3

Any larval fish will die if it

Accepted Answer

A)  hatches before it can feed. 
B)  is not fed by a parent. 
C)  hatches before it is an adult. 
D)  hatches as a feeding larva. 
E)  cannot find food after using up its yolk. 
A)  hatches before it can feed. 
B)  is not fed by a parent. 
C)  hatches before it is an adult. 
D)  hatches as a feeding larva. 
E)  cannot find food after using up its yolk. E

Question 4

Mifepristone,often called RU-486,is a drug that can be taken to prevent a pregnancy after unprotected sex.This drug blocks progesterone receptors.Therefore,its most direct mode of action to prevent pregnancy is to

Accepted Answer

A)  prevent the secretion of estrogen. 
B)  prevent the thickened endometrium from being maintained. 
C)  induce the secretion of LH from the corpus luteum. 
D)  induce a sudden increase in the secretion of FSH from the anterior pituitary. 
E)  prevent secretion of progesterone from the corpus luteum. 
A)  prevent the secretion of estrogen. 
B)  prevent the thickened endometrium from being maintained. 
C)  induce the secretion of LH from the corpus luteum. 
D)  induce a sudden increase in the secretion of FSH from the anterior pituitary. 
E)  prevent secretion of progesterone from the corpus luteum.

Question 5

If the hypothalamus in a human male does not produce GnRH in normal amounts,

Accepted Answer

A)  his sperm are functional but he is unable to ejaculate. 
B)  his sperm develop multiple flagella. 
C)  the fluid needed to lubricate his urethra for sperm travel is defective. 
D)  his semen lacks the fructose fuel needed for the sperm to swim. 
E)  his Leydig cells do not make the testosterone needed to stimulate spermatogenesis. 
A)  his sperm are functional but he is unable to ejaculate. 
B)  his sperm develop multiple flagella. 
C)  the fluid needed to lubricate his urethra for sperm travel is defective. 
D)  his semen lacks the fructose fuel needed for the sperm to swim. 
E)  his Leydig cells do not make the testosterone needed to stimulate spermatogenesis.

Question 6

Which cells in the mammalian male reproductive system nourish the developing germ cells as they become sperm?

Accepted Answer

A)  Sertoli cells 
B)  Leydig cells 
C)  Epididymal cells 
D)  Cells lining the vas deferens 
E)  Cells lining the seminiferous tubules 
A)  Sertoli cells 
B)  Leydig cells 
C)  Epididymal cells 
D)  Cells lining the vas deferens 
E)  Cells lining the seminiferous tubules

Question 7

Which organisms are semelparous?

Accepted Answer

A)  Pacific salmons 
B)  Wood ducks 
C)  Humans 
D)  Antarctic fur seals 
E)  Blue crabs 
A)  Pacific salmons 
B)  Wood ducks 
C)  Humans 
D)  Antarctic fur seals 
E)  Blue crabs

Question 8

If the seminal vesicles in a human male are defective,

Accepted Answer

A)  his sperm are functional,but they are unable to travel through the vas deferens. 
B)  his sperm lack functional flagella. 
C)  the fluid needed to lubricate his ureter for sperm travel is defective. 
D)  his semen lacks the fructose fuel needed for the sperm to swim. 
E)  his Leydig cells do not make the testosterone needed to stimulate spermatogenesis. 
A)  his sperm are functional,but they are unable to travel through the vas deferens. 
B)  his sperm lack functional flagella. 
C)  the fluid needed to lubricate his ureter for sperm travel is defective. 
D)  his semen lacks the fructose fuel needed for the sperm to swim. 
E)  his Leydig cells do not make the testosterone needed to stimulate spermatogenesis.

Question 9

Unlike spermatogenesis,oogenesis in humans

Accepted Answer

A)  is continuous over the life of the person. 
B)  begins prenatally. 
C)  produces four haploid gametes from a single germ cell. 
D)  occurs at a rapid rate. 
E)  results in swimming cells. 
A)  is continuous over the life of the person. 
B)  begins prenatally. 
C)  produces four haploid gametes from a single germ cell. 
D)  occurs at a rapid rate. 
E)  results in swimming cells.

Question 10

Which statement about the ovarian and uterine cycles in a mammal is false?

Accepted Answer

A)  Falling estrogen and progesterone levels induce menstruation. 
B)  A sudden rise in LH induces ovulation. 
C)  Estrogen levels rise in the first half of the ovarian cycle and progesterone levels rise in the second half. 
D)  If fertilization occurs,the corpus luteum secretes hCG. 
E)  Estrogen is produced by follicle cells. 
A)  Falling estrogen and progesterone levels induce menstruation. 
B)  A sudden rise in LH induces ovulation. 
C)  Estrogen levels rise in the first half of the ovarian cycle and progesterone levels rise in the second half. 
D)  If fertilization occurs,the corpus luteum secretes hCG. 
E)  Estrogen is produced by follicle cells.

Question 11

Use the following to answer questions :
Refer to the diagram below.  
-In the diagram,mitosis is occurring at label(s)_______,and a cell that is haploid is found at label(s)_______.

Accepted Answer

A)  1;2 
B)  1;3 
C)  1 and 4;2 and 3 
D)  4;2 
E)  4;3 
A)  1;2 
B)  1;3 
C)  1 and 4;2 and 3 
D)  4;2 
E)  4;3

Question 12

A cell containing only half the normal number of chromosomes is found in a female's ovary,yet those chromosomes show signs of having undergone one meiotic division.Oddly,it also has essentially no cytoplasm.This cell is almost certainly a(n)

Accepted Answer

A)  polar body. 
B)  oocyte. 
C)  follicle cell. 
D)  mitotic germ cell. 
E)  somatic cell. 
A)  polar body. 
B)  oocyte. 
C)  follicle cell. 
D)  mitotic germ cell. 
E)  somatic cell.

Question 13

Of the methods of contraception listed,which one also helps prevent the spread of sexually transmitted diseases?

Accepted Answer

A)  Diaphragm 
B)  Spermicide 
C)  Condom 
D)  IUD 
E)  Birth control pill 
A)  Diaphragm 
B)  Spermicide 
C)  Condom 
D)  IUD 
E)  Birth control pill

Question 14

Which process results in progeny that inherit all their genes from a single parent?

Accepted Answer

A)  Copulation 
B)  Asexual reproduction 
C)  Gametogenesis 
D)  Sexual reproduction 
E)  Fertilization 
A)  Copulation 
B)  Asexual reproduction 
C)  Gametogenesis 
D)  Sexual reproduction 
E)  Fertilization

Question 15

If a man is infertile due to a low sperm count,what simple change could result in his becoming fertile?

Accepted Answer

A)  Wearing warmer clothes 
B)  Wearing loose instead of tight pants 
C)  Eating foods containing fructose instead of sucrose 
D)  Eating foods containing sucrose 
E)  Increasing his caffeine consumption 
A)  Wearing warmer clothes 
B)  Wearing loose instead of tight pants 
C)  Eating foods containing fructose instead of sucrose 
D)  Eating foods containing sucrose 
E)  Increasing his caffeine consumption

Question 16

The figure below shows meiotic divisions that occur in _______.The number of chromosomes in the cell marked 1 is _______,and the number of chromosomes in the cell marked 2 is _______.

Accepted Answer

A)  germ cells in an ovary;2n;1n 
B)  developing ova;2n;1n 
C)  germ cells in a testis;1n;1n 
D)  developing sperm;2n;2n 
E)  germ cells in either a testis or ovary;2n;1n 
A)  germ cells in an ovary;2n;1n 
B)  developing ova;2n;1n 
C)  germ cells in a testis;1n;1n 
D)  developing sperm;2n;2n 
E)  germ cells in either a testis or ovary;2n;1n

Question 17

The end result of spermatogenesis is the production of four haploid sperm from a single diploid germ cell.The end result of oogenesis is the production of _______ from a single diploid germ cell.

Accepted Answer

A)  four haploid ova 
B)  two haploid ova 
C)  one haploid ovum 
D)  one diploid ovum 
E)  two diploid ova 
A)  four haploid ova 
B)  two haploid ova 
C)  one haploid ovum 
D)  one diploid ovum 
E)  two diploid ova

Question 18

When a woman breastfeeds an infant,the breastfeeding itself causes her uterus to contract and stimulates her breasts to make and release milk.Breastfeeding,therefore,causes

Accepted Answer

A)  inhibition of GnRH release from the anterior pituitary. 
B)  release of oxytocin and prolactin from the pituitary. 
C)  release of oxytocin from the anterior pituitary and ovary. 
D)  inhibition of FSH and LH release from the hypothalamus. 
E)  release of prolactin from the corpus luteum. 
A)  inhibition of GnRH release from the anterior pituitary. 
B)  release of oxytocin and prolactin from the pituitary. 
C)  release of oxytocin from the anterior pituitary and ovary. 
D)  inhibition of FSH and LH release from the hypothalamus. 
E)  release of prolactin from the corpus luteum.

Question 19

Which is a secondary sexual characteristic found in human females?

Accepted Answer

A)  Long hair 
B)  Uterus 
C)  Ovary 
D)  Menstruation 
E)  Lack of facial hair 
A)  Long hair 
B)  Uterus 
C)  Ovary 
D)  Menstruation 
E)  Lack of facial hair

Question 20

You are dissecting a worm and find that it has two sets of gonads,one set containing eggs and the other set containing sperm.You most likely have found a worm that

Accepted Answer

A)  is undergoing metamorphosis. 
B)  is a sequential hermaphrodite. 
C)  can function as a male and female simultaneously. 
D)  is in a larval stage. 
E)  can mate with only females of its own species. 
A)  is undergoing metamorphosis. 
B)  is a sequential hermaphrodite. 
C)  can function as a male and female simultaneously. 
D)  is in a larval stage. 
E)  can mate with only females of its own species.

Exam 37: Animal Reproduction

In mammals,if the egg is not fertilized following ovulation,the follicle cells of the corpus luteum

Which statement about blocks to polyspermy in sea urchins is false?

Any larval fish will die if it

Mifepristone,often called RU-486,is a drug that can be taken to prevent a pregnancy after unprotected sex.This drug blocks progesterone receptors.Therefore,its most direct mode of action to prevent pregnancy is to

If the hypothalamus in a human male does not produce GnRH in normal amounts,

Which cells in the mammalian male reproductive system nourish the developing germ cells as they become sperm?

Which organisms are semelparous?

If the seminal vesicles in a human male are defective,

Unlike spermatogenesis,oogenesis in humans

Which statement about the ovarian and uterine cycles in a mammal is false?

Use the following to answer questions : Refer to the diagram below. -In the diagram,mitosis is occurring at label(s)_______,and a cell that is haploid is found at label(s)_______.

A cell containing only half the normal number of chromosomes is found in a female's ovary,yet those chromosomes show signs of having undergone one meiotic division.Oddly,it also has essentially no cytoplasm.This cell is almost certainly a(n)

Of the methods of contraception listed,which one also helps prevent the spread of sexually transmitted diseases?

Which process results in progeny that inherit all their genes from a single parent?

If a man is infertile due to a low sperm count,what simple change could result in his becoming fertile?

The figure below shows meiotic divisions that occur in _______.The number of chromosomes in the cell marked 1 is _______,and the number of chromosomes in the cell marked 2 is _______.

The end result of spermatogenesis is the production of four haploid sperm from a single diploid germ cell.The end result of oogenesis is the production of _______ from a single diploid germ cell.

When a woman breastfeeds an infant,the breastfeeding itself causes her uterus to contract and stimulates her breasts to make and release milk.Breastfeeding,therefore,causes

Which is a secondary sexual characteristic found in human females?

You are dissecting a worm and find that it has two sets of gonads,one set containing eggs and the other set containing sperm.You most likely have found a worm that

Introduction

The Chemistry and Energy of Life

Nucleic Acids, Proteins, and Enzymes

Cells: the Working Units of Life

Cell Membranes and Signaling

Pathways That Harvest and Store Chemical Energy

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

DNA and Its Role in Heredity

From Dna to Protein: Gene Expression

Regulation of Gene Expression

Genomes

Biotechnology

Genes, Development, and Evolution

Processes of Evolution

Reconstructing and Using Phylogenies

Speciation

The History of Life on Earth

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

The Evolution of Plants

The Evolution and Diversity of Fungi

Animal Origins and Diversity

The Plant Body

Plant Nutrition and Transport

Plant Growth and Development

Reproduction of Flowering Plants

Plants in the Environment

Fundamentals of Animal Function

Nutrition and Digestion

Breathing

Circulation

Muscle and Movement

Neurons, Sense Organs, and Nervous Systems

Nervous and Endocrine Control

Water and Salts: Excretion

Animal Development

Immunology: Animal Defense Systems

Animal Behavior

The Distribution of Earths Ecological Systems

Populations

Ecological and Evolutionary Consequences of Interactions Within and Among Species

Ecological Communities

The Global Ecosystem

Filters

Use the following to answer questions : Refer to the diagram below. -In the diagram,mitosis is occurring at label(s)_,and a cell that is haploid is found at label(s)_.

The figure below shows meiotic divisions that occur in ___.The number of chromosomes in the cell marked 1 is _,and the number of chromosomes in the cell marked 2 is _____.