Question 1

In human females,the ovarian cycle begins when the ________.

Accepted Answer

A) levels of estrogen reach their maximum 
B) hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH 
C) level of progesterone drops precipitously 
D) levels of FSH and LH drop precipitously 
A) levels of estrogen reach their maximum 
B) hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH 
C) level of progesterone drops precipitously 
D) levels of FSH and LH drop precipitously B

Question 2

Where in a woman's reproductive tract does fertilization most often take place?

Accepted Answer

A) in the ovary 
B) in the oviduct 
C) in the follicle 
D) in the uterus 
A) in the ovary 
B) in the oviduct 
C) in the follicle 
D) in the uterus B

Question 3

The data below are average temperatures from an experiment with more than 100 men in boxers and in briefs. Boxers Briefs
Core Body temp 36.6 36.5
Surface skin temp 30.8 30.9
Scrotal skin temp 33.8 33.6
What conclusion can be drawn from these data?

Accepted Answer

A) Men who wore briefs were cooler overall than men who wore boxers. 
B) The type of underwear men wear has no impact on fertility. 
C) The generally held idea is confirmed that men who wear boxers have cooler scrotal temperatures than those who wear briefs. 
D) Scrotal temperature is not significantly decreased by wearing boxers rather than briefs. 
A) Men who wore briefs were cooler overall than men who wore boxers. 
B) The type of underwear men wear has no impact on fertility. 
C) The generally held idea is confirmed that men who wear boxers have cooler scrotal temperatures than those who wear briefs. 
D) Scrotal temperature is not significantly decreased by wearing boxers rather than briefs. D

Question 4

A diaphragm functions as a birth control device by ________.

Accepted Answer

A) preventing ovulation 
B) preventing implantation of an embryo 
C) stimulating the production of sperm-killing antibodies 
D) preventing the movement of sperm into the uterus 
A) preventing ovulation 
B) preventing implantation of an embryo 
C) stimulating the production of sperm-killing antibodies 
D) preventing the movement of sperm into the uterus

Question 5

According to the diagram above,after a vasectomy (within the scrotal sac),________.

Accepted Answer

A) secretions from the prostate can no longer reach the urethra 
B) secretions from the seminal vesicles can no longer reach the urethra 
C) secretions from the sperm duct can no longer reach the urethra 
D) sperm from the testes can no longer reach the urethra 
A) secretions from the prostate can no longer reach the urethra 
B) secretions from the seminal vesicles can no longer reach the urethra 
C) secretions from the sperm duct can no longer reach the urethra 
D) sperm from the testes can no longer reach the urethra

Question 6

The lifeline between the embryo and the placenta ________.

Accepted Answer

A) is derived from the yolk sac 
B) is derived from the amnion 
C) is called the "chorion" 
D) is called the "umbilical cord" 
A) is derived from the yolk sac 
B) is derived from the amnion 
C) is called the "chorion" 
D) is called the "umbilical cord"

Question 7

Researchers have found a general relationship between testicular cancer and exercise.Increased exercise is associated with a decrease in incidence of testicular cancer.However,a positive relationship (increased incidence of testicular cancer)was found between testicular cancer and riding bikes or horses.Several factors might be hypothesized to bring about this result.All but one of the following statements are reasonable hypotheses that researchers might follow to seek the cause for this relationship.Choose the exception.

Accepted Answer

A) Riding bikes or horses causes trauma to the testes. 
B) The seat on bikes and the saddle on horses are made of material containing chemicals that damage testicular cells. 
C) Riding bikes or horses increases scrotal temperature,which damages testicular cells. 
D) Mutations that lead to testicular cancer make men more likely to ride bikes or horses. 
A) Riding bikes or horses causes trauma to the testes. 
B) The seat on bikes and the saddle on horses are made of material containing chemicals that damage testicular cells. 
C) Riding bikes or horses increases scrotal temperature,which damages testicular cells. 
D) Mutations that lead to testicular cancer make men more likely to ride bikes or horses.

Question 8

Which one of the following is the earliest event in the process of fertilization?

Accepted Answer

A) Sperm contact the jelly coat around the egg. 
B) The sperm head plasma membrane fuses with the egg plasma membrane. 
C) Enzymes from the acrosome are released. 
D) The sperm nucleus enters the cytoplasm of the egg. 
A) Sperm contact the jelly coat around the egg. 
B) The sperm head plasma membrane fuses with the egg plasma membrane. 
C) Enzymes from the acrosome are released. 
D) The sperm nucleus enters the cytoplasm of the egg.

Question 9

Gastrulation ________.

Accepted Answer

A) produces a solid ball of cells 
B) changes the blastocyst into an embryo that has three tissue layers 
C) changes the fertilized egg into a blastocyst 
D) changes a gastrula into a blastocyst 
A) produces a solid ball of cells 
B) changes the blastocyst into an embryo that has three tissue layers 
C) changes the fertilized egg into a blastocyst 
D) changes a gastrula into a blastocyst

Question 10

At about what point in gestation can an ultrasound exam determine the sex of the fetus?

Accepted Answer

A) about 4 weeks after fertilization 
B) at the end of the first trimester 
C) about 20 weeks after fertilization 
D) at the end of the second trimester 
A) about 4 weeks after fertilization 
B) at the end of the first trimester 
C) about 20 weeks after fertilization 
D) at the end of the second trimester

Question 11

What advantage is associated with human testes located in an external sac rather than in the abdominal cavity?

Accepted Answer

A) a shorter distance that semen must travel during ejaculation 
B) the testes can be kept at a constant temperature 
C) the testes can be kept cooler than the body's interior 
D) the testes can enlarge at sexual maturity 
A) a shorter distance that semen must travel during ejaculation 
B) the testes can be kept at a constant temperature 
C) the testes can be kept cooler than the body's interior 
D) the testes can enlarge at sexual maturity

Question 12

Which of these events occurs first?

Accepted Answer

A) gastrulation 
B) cleavage 
C) implantation 
D) formation of the placenta 
A) gastrulation 
B) cleavage 
C) implantation 
D) formation of the placenta

Question 13

The "grandmother hypothesis" suggests that natural selection may have favored a woman ________.

Accepted Answer

A) moving away from her children and grandchildren 
B) focusing her energy on caring for her grandchildren,instead of producing more children 
C) focusing her energy on the production of as many children as possible before reaching menopause 
D) helping her sisters produce more children 
A) moving away from her children and grandchildren 
B) focusing her energy on caring for her grandchildren,instead of producing more children 
C) focusing her energy on the production of as many children as possible before reaching menopause 
D) helping her sisters produce more children

Question 14

Which one of the following statements is TRUE?

Accepted Answer

A) Natural family planning is one of the most reliable forms of birth control. 
B) Morning-after pills are about 25% effective at preventing pregnancy. 
C) Tubal ligation prevents ovulation. 
D) A vasectomy involves removing a section of each vas deferens. 
A) Natural family planning is one of the most reliable forms of birth control. 
B) Morning-after pills are about 25% effective at preventing pregnancy. 
C) Tubal ligation prevents ovulation. 
D) A vasectomy involves removing a section of each vas deferens.

Question 15

What does the ovarian cycle image above illustrate?

Accepted Answer

A) A rise in the level of luteinizing hormone brings about ovulation. 
B) A rise in the level of estrogen brings about ovulation. 
C) The endometrium is thinner during the first half of the cycle than during the latter half. 
D) A corpus luteum is necessary for ovulation. 
A) A rise in the level of luteinizing hormone brings about ovulation. 
B) A rise in the level of estrogen brings about ovulation. 
C) The endometrium is thinner during the first half of the cycle than during the latter half. 
D) A corpus luteum is necessary for ovulation.

Question 16

Hermaphrodites ________.

Accepted Answer

A) possess both male and female reproductive systems 
B) have the gonads of one sex but the external appearance of the other 
C) usually fertilize themselves 
D) have abnormal reproductive systems 
A) possess both male and female reproductive systems 
B) have the gonads of one sex but the external appearance of the other 
C) usually fertilize themselves 
D) have abnormal reproductive systems

Question 17

Asexual reproduction ________.

Accepted Answer

A) creates individuals with unique combinations of genes 
B) generates enormous genetic variation 
C) is an effective way for animals to expand their population quickly and exploit an available environment 
D) provides greater adaptability to changing environments 
A) creates individuals with unique combinations of genes 
B) generates enormous genetic variation 
C) is an effective way for animals to expand their population quickly and exploit an available environment 
D) provides greater adaptability to changing environments

Question 18

What data besides core,skin,and scrotal temperatures would be good to gather to support or reject the hypothesis that underwear type affects fertility?

Accepted Answer

A) the size and position of participants' testes 
B) the number and quality of sperm in wearers of each type of underwear 
C) the ability of participants to maintain temperature in very cold or very warm conditions 
D) the fertility of each man's partner 
A) the size and position of participants' testes 
B) the number and quality of sperm in wearers of each type of underwear 
C) the ability of participants to maintain temperature in very cold or very warm conditions 
D) the fertility of each man's partner

Question 19

At about what point in gestation does the fetal heartbeat become audible by stethoscope and the fetus's movements easily felt by the mother?

Accepted Answer

A) 15 weeks 
B) 20 weeks 
C) 25 weeks 
D) 30 weeks 
A) 15 weeks 
B) 20 weeks 
C) 25 weeks 
D) 30 weeks

Question 20

Reproductive systems with external fertilization are most common in ________.

Accepted Answer

A) populations with many more males than females 
B) animals that are widely dispersed 
C) aquatic animals 
D) populations with many more females than males 
A) populations with many more males than females 
B) animals that are widely dispersed 
C) aquatic animals 
D) populations with many more females than males

Exam 26: Reproduction and Development

In human females,the ovarian cycle begins when the ________.

Where in a woman's reproductive tract does fertilization most often take place?

The data below are average temperatures from an experiment with more than 100 men in boxers and in briefs. Boxers Briefs Core Body temp 36.6 36.5 Surface skin temp 30.8 30.9 Scrotal skin temp 33.8 33.6 What conclusion can be drawn from these data?

A diaphragm functions as a birth control device by ________.

According to the diagram above,after a vasectomy (within the scrotal sac),________.

The lifeline between the embryo and the placenta ________.

Which one of the following is the earliest event in the process of fertilization?

Gastrulation ________.

At about what point in gestation can an ultrasound exam determine the sex of the fetus?

What advantage is associated with human testes located in an external sac rather than in the abdominal cavity?

Which of these events occurs first?

The "grandmother hypothesis" suggests that natural selection may have favored a woman ________.

Which one of the following statements is TRUE?

What does the ovarian cycle image above illustrate?

Hermaphrodites ________.

Asexual reproduction ________.

What data besides core,skin,and scrotal temperatures would be good to gather to support or reject the hypothesis that underwear type affects fertility?

At about what point in gestation does the fetal heartbeat become audible by stethoscope and the fetus's movements easily felt by the mother?

Reproductive systems with external fertilization are most common in ________.

Introduction: Biology Today

Essential Chemistry for Biology

The Molecules of Life

A Tour of the Cell

The Working Cell

Cellular Respiration: Obtaining Energy From Food

Photosynthesis: Using Light to Make Food

Cellular Reproduction: Cells From Cells

Patterns of Inheritance

The Structure and Function of Dna

How Genes Are Controlled

DNA Technology

How Populations Evolve

How Biological Diversity Evolves

The Evolution of Microbial Life

The Evolution of Plants and Fungi

The Evolution of Animals

An Introduction to Ecology and the Biosphere

Population Ecology

Communities and Ecosystems

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Circulation and Respiration

The Bodys Defenses

Hormones

Nervous,Sensory,and Locomotor Systems

The Life of a Flowering Plant

The Working Plant

Filters