Question 1

Teratogens are substances that

Accepted Answer

A) cause birth defects. 
B) protect against infection. 
C) prevent accumulation of cholesterol. 
D) cause genetic disease. 
A) cause birth defects. 
B) protect against infection. 
C) prevent accumulation of cholesterol. 
D) cause genetic disease. A

Question 2

Spermatocytes and oocytes are called

Accepted Answer

A) grommets. 
B) marmites. 
C) gametes. 
D) gonads. 
A) grommets. 
B) marmites. 
C) gametes. 
D) gonads. C

Question 3

The female gamete just before it is fertilized is termed

Accepted Answer

A) a secondary oocyte. 
B) an oogonium. 
C) a zygote. 
D) a reprocyte. 
A) a secondary oocyte. 
B) an oogonium. 
C) a zygote. 
D) a reprocyte. A

Question 4

The correct sequence for the steps of meiosis I is

Accepted Answer

A) telophase-anaphase-metaphase-prophase 
B) 46 chromosomes,23 chromosomes,then 46 chromosomes 
C) prophase-metaphase-anaphase-telophase 
D) anaphase-metaphase-prophase-telophase 
A) telophase-anaphase-metaphase-prophase 
B) 46 chromosomes,23 chromosomes,then 46 chromosomes 
C) prophase-metaphase-anaphase-telophase 
D) anaphase-metaphase-prophase-telophase

Question 5

Sperm undergo capacitation

Accepted Answer

A) in the testicles as sperm develop. 
B) in the woman's body. 
C) just after the second polar body is ejected. 
D) immediately following a sperm's penetration of an oocyte. 
A) in the testicles as sperm develop. 
B) in the woman's body. 
C) just after the second polar body is ejected. 
D) immediately following a sperm's penetration of an oocyte.

Question 6

Meiosis is necessary because otherwise

Accepted Answer

A) the fertilized ovum will have too much genetic material. 
B) the fertilized ovum will have too little genetic material. 
C) reproduction would have to be asexual. 
D) too many mutations will occur. 
A) the fertilized ovum will have too much genetic material. 
B) the fertilized ovum will have too little genetic material. 
C) reproduction would have to be asexual. 
D) too many mutations will occur.

Question 7

Tanisha and Tawanda are twins but do not look alike.They are the result of fertilization of

Accepted Answer

A) one oocyte by two sperm cells. 
B) two oocytes by one sperm cell. 
C) two oocytes by two sperm cells. 
D) one oogonium by one spermatogonium. 
A) one oocyte by two sperm cells. 
B) two oocytes by one sperm cell. 
C) two oocytes by two sperm cells. 
D) one oogonium by one spermatogonium.

Question 8

Thalidomide is

Accepted Answer

A) a drug that causes fetal limb defects,but is used to treat leprosy. 
B) a drug that causes mental retardation in fetuses,but is used to treat acne. 
C) a type of bacterial infection. 
D) a vitamin that harms fetuses in megadoses. 
A) a drug that causes fetal limb defects,but is used to treat leprosy. 
B) a drug that causes mental retardation in fetuses,but is used to treat acne. 
C) a type of bacterial infection. 
D) a vitamin that harms fetuses in megadoses.

Question 9

Current thinking about the cause of Hutchinson-Gilford syndrome,which is a severe segmental progeroid syndrome,is that

Accepted Answer

A) the body is unable to secrete insulin. 
B) the part of the brain that controls aging is damaged. 
C) abnormal lamin A protein stresses the nuclear membrane,disturbing DNA repair such that mutations accumulate that cause the diseases of aging. 
D) a protein called progerin forms clumps in the brain in a way that removes DNA from the tips of telomeres,shortening chromosomes and lifespan. 
A) the body is unable to secrete insulin. 
B) the part of the brain that controls aging is damaged. 
C) abnormal lamin A protein stresses the nuclear membrane,disturbing DNA repair such that mutations accumulate that cause the diseases of aging. 
D) a protein called progerin forms clumps in the brain in a way that removes DNA from the tips of telomeres,shortening chromosomes and lifespan.

Question 10

The major body part(s)derived from ectoderm is/are

Accepted Answer

A) the nervous system and skin. 
B) bone tissue. 
C) the respiratory tract,urinary bladder,and urethra. 
D) the liver and pancreas. 
A) the nervous system and skin. 
B) bone tissue. 
C) the respiratory tract,urinary bladder,and urethra. 
D) the liver and pancreas.

Question 11

_____ prepares sperm for penetration of the oocyte.

Accepted Answer

A) Capacitation 
B) Differentiation 
C) Meiosis 
D) Frenulation 
A) Capacitation 
B) Differentiation 
C) Meiosis 
D) Frenulation

Question 12

Amniotic fluid

Accepted Answer

A) absorbs wastes the fetus excretes. 
B) protects the embryo against jarring movements. 
C) prevents the fetus from becoming thirsty. 
D) is a fetal form of blooD. 
A) absorbs wastes the fetus excretes. 
B) protects the embryo against jarring movements. 
C) prevents the fetus from becoming thirsty. 
D) is a fetal form of blooD.

Question 13

At the end of meiosis,the number of chromosomes in each daughter cell is halved because meiosis has

Accepted Answer

A) two cell divisions and no DNA replication. 
B) two cell divisions,but one DNA replication. 
C) one cell division and two DNA replications. 
D) one cell division and one DNA replication. 
A) two cell divisions and no DNA replication. 
B) two cell divisions,but one DNA replication. 
C) one cell division and two DNA replications. 
D) one cell division and one DNA replication.

Question 14

Two oocytes released from the same ovary at the same time and fertilized by two sperm results in

Accepted Answer

A) monozygotic twins. 
B) dizygotic twins. 
C) blighted ova. 
D) cloned embryos. 
A) monozygotic twins. 
B) dizygotic twins. 
C) blighted ova. 
D) cloned embryos.

Question 15

Amanda is curious to know how many chromosomes are in each somatic cell of a chicken she was relishing.She looks it up and finds that it has 78 chromosomes.Therefore,a sperm or an unfertilized egg from a chicken would contain _____ chromosomes.

Accepted Answer

A) 23 
B) 39 
C) 46 
D) 78 
A) 23 
B) 39 
C) 46 
D) 78

Question 16

The zona pellucida is

Accepted Answer

A) a protective layer around the secondary oocyte. 
B) a protective layer around the sperm. 
C) a bump on the head of a sperm that contains enzymes. 
D) the biggest constriction of a chromosome. 
A) a protective layer around the secondary oocyte. 
B) a protective layer around the sperm. 
C) a bump on the head of a sperm that contains enzymes. 
D) the biggest constriction of a chromosome.

Question 17

The tubular part of the uterus that extends downward into the upper vagina is the

Accepted Answer

A) cervix. 
B) labia. 
C) rectum. 
D) ovary. 
A) cervix. 
B) labia. 
C) rectum. 
D) ovary.

Question 18

An embryo develops rudiments of all organs by week _____ of prenatal development.

Accepted Answer

A) 8 
B) 4 
C) 6 
D) 3 
A) 8 
B) 4 
C) 6 
D) 3

Question 19

The partial twinning that led to the births of conjoined twins Abby and Brittany Hensel must have happened during the first two weeks of gestation,because the girls

Accepted Answer

A) share tissues that descend from ectoderm,endoderm,and mesoderm. 
B) share only tissues derived from mesoderm. 
C) were born on time. 
D) have two separate nervous systems. 
A) share tissues that descend from ectoderm,endoderm,and mesoderm. 
B) share only tissues derived from mesoderm. 
C) were born on time. 
D) have two separate nervous systems.

Question 20

The sirtuin,resveratrol,is a natural component of

Accepted Answer

A) turtle soup 
B) owl meat 
C) cigarette smoke 
D) red wine 
A) turtle soup 
B) owl meat 
C) cigarette smoke 
D) red wine

Exam 3: Meiosis,Development and Aging

Teratogens are substances that

Spermatocytes and oocytes are called

The female gamete just before it is fertilized is termed

The correct sequence for the steps of meiosis I is

Sperm undergo capacitation

Meiosis is necessary because otherwise

Tanisha and Tawanda are twins but do not look alike.They are the result of fertilization of

Thalidomide is

Current thinking about the cause of Hutchinson-Gilford syndrome,which is a severe segmental progeroid syndrome,is that

The major body part(s)derived from ectoderm is/are

_____ prepares sperm for penetration of the oocyte.

Amniotic fluid

At the end of meiosis,the number of chromosomes in each daughter cell is halved because meiosis has

Two oocytes released from the same ovary at the same time and fertilized by two sperm results in

Amanda is curious to know how many chromosomes are in each somatic cell of a chicken she was relishing.She looks it up and finds that it has 78 chromosomes.Therefore,a sperm or an unfertilized egg from a chicken would contain _____ chromosomes.

The zona pellucida is

The tubular part of the uterus that extends downward into the upper vagina is the

An embryo develops rudiments of all organs by week _____ of prenatal development.

The partial twinning that led to the births of conjoined twins Abby and Brittany Hensel must have happened during the first two weeks of gestation,because the girls

The sirtuin,resveratrol,is a natural component of

What Is in a Human Genome

Cells

Single-Gene Inheritance

Beyond Mendels Laws

Matters of Sex

Multifactorial Traits

Genetics of Behavior

DNA Structure and Replication

Gene Action: From DNA to Protein

Gene Expression and Epigenetics

Gene Mutation

Chromosomes

Constant Allele Frequencies

Changing Allele Frequencies

Human Ancestry and Evolution

Genetics of Immunity

Cancer Genetics and Genomics

Genetic Technologies: Patenting, modifying, and Monitoring Dna

Genetic Testing and Treatment

Reproductive Technologies

Genomics

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