Question 1

Fingers and toes begin to develop _____ days after fertilization.

Accepted Answer

A) 16-20 
B) 26-30 
C) 36-40 
D) 46-50 
E) 56-60 
A) 16-20 
B) 26-30 
C) 36-40 
D) 46-50 
E) 56-60

Question 2

The stage from the fertilization of the ovum and implantation until the onset of parturition is

Accepted Answer

A) gestation. 
B) the first stage or dilation phase of labor. 
C) the second stage or expulsion phase of labor. 
D) the third stage or placental phase of labor. 
A) gestation. 
B) the first stage or dilation phase of labor. 
C) the second stage or expulsion phase of labor. 
D) the third stage or placental phase of labor.

Question 3

Which of the following statements is FALSE?

Accepted Answer

A) Growth of the placenta essentially stops at 35 weeks therefore limiting fetal growth. 
B) At 38 weeks,the fetus has progressed to the point at which it is ready to be delivered. 
C) Peak body growth occurs late in gestation. 
D) Late in gestation,as placental size reaches a maximum,the oxygen and nutrient supply becomes limited. 
E) The lanugo and vernix caseosa aid the newborn in sucking by supporting the cheeks and creating a vacuum in the oral cavity. 
A) Growth of the placenta essentially stops at 35 weeks therefore limiting fetal growth. 
B) At 38 weeks,the fetus has progressed to the point at which it is ready to be delivered. 
C) Peak body growth occurs late in gestation. 
D) Late in gestation,as placental size reaches a maximum,the oxygen and nutrient supply becomes limited. 
E) The lanugo and vernix caseosa aid the newborn in sucking by supporting the cheeks and creating a vacuum in the oral cavity.

Question 4

The middle germ layer is the

Accepted Answer

A) ectoderm. 
B) endoderm. 
C) mesoderm. 
A) ectoderm. 
B) endoderm. 
C) mesoderm.

Question 5

A woman is told by her physician that her pregnancy has progressed 44 days since her last menstrual period (LMP).How many days has the embryo been developing?

Accepted Answer

A) 16 days 
B) 30 days 
C) 44 days 
D) 58 days 
E) 72 days 
A) 16 days 
B) 30 days 
C) 44 days 
D) 58 days 
E) 72 days

Question 6

The chorion (later placenta)secretes

Accepted Answer

A) HCG. 
B) FSH. 
C) LH. 
D) TSH. 
E) ADH. 
A) HCG. 
B) FSH. 
C) LH. 
D) TSH. 
E) ADH.

Question 7

Which one of the following is NOT a polygenic trait?

Accepted Answer

A) eye color 
B) skin color 
C) height 
D) intelligence 
E) All of these are polygenic traits. 
A) eye color 
B) skin color 
C) height 
D) intelligence 
E) All of these are polygenic traits.

Question 8

Which of these organ systems is developed from all three germ layers?

Accepted Answer

A) integumentary system 
B) nervous system 
C) endocrine system 
D) cardiovascular system 
E) lymphatic system 
A) integumentary system 
B) nervous system 
C) endocrine system 
D) cardiovascular system 
E) lymphatic system

Question 9

Which of these is NOT a factor that stimulates parturition?

Accepted Answer

A) progesterone synthesis levels off 
B) estrogen synthesis increases 
C) prostaglandin synthesis increases 
D) adrenal steroids are produced by the fetus 
E) prolactin is produced by the anterior pituitary 
A) progesterone synthesis levels off 
B) estrogen synthesis increases 
C) prostaglandin synthesis increases 
D) adrenal steroids are produced by the fetus 
E) prolactin is produced by the anterior pituitary

Question 10

Which of the following statements about death is false?

Accepted Answer

A) Death is usually not attributed to old age 
B) Modern definitions of death are based on the loss of heartbeat and respiration 
C) Death is the permanent cessation of life functions 
D) Whole brain death is manifested by a flat electroencephalogram for at least 30 minutes 
E) Neocortical death is a condition in which major portions of the cerebrum are no longer functioning 
A) Death is usually not attributed to old age 
B) Modern definitions of death are based on the loss of heartbeat and respiration 
C) Death is the permanent cessation of life functions 
D) Whole brain death is manifested by a flat electroencephalogram for at least 30 minutes 
E) Neocortical death is a condition in which major portions of the cerebrum are no longer functioning

Question 11

Males are determined by

Accepted Answer

A) the presence of only one type of X chromosome. 
B) not having two X chromosomes. 
C) the presence of a Y chromosome. 
D) a gene carried on chromosome pair number 21. 
E) a gene carried on chromosome pair number 1. 
A) the presence of only one type of X chromosome. 
B) not having two X chromosomes. 
C) the presence of a Y chromosome. 
D) a gene carried on chromosome pair number 21. 
E) a gene carried on chromosome pair number 1.

Question 12

During the fetal period of development

Accepted Answer

A) the organ systems are already present. 
B) there is mainly growth and maturation of organs. 
C) there is about a 1,400-fold increase in weight. 
D) subcutaneous fat accumulates. 
E) all of these events occur. 
A) the organ systems are already present. 
B) there is mainly growth and maturation of organs. 
C) there is about a 1,400-fold increase in weight. 
D) subcutaneous fat accumulates. 
E) all of these events occur.

Question 13

Chorionic villi protrude into blood-filled cavities called _____ formed within the maternal endometrium.

Accepted Answer

A) blastocysts 
B) blastoceles 
C) lacunae 
D) chorion 
E) inner cell masses 
A) blastocysts 
B) blastoceles 
C) lacunae 
D) chorion 
E) inner cell masses

Question 14

During early cell division,the overall size of the zygote ________ while the number of cells ___________.

Accepted Answer

A) increases; remains the same 
B) increases; increases 
C) remains the same; increases 
D) remains the same; decreases 
E) decreases; remains the same 
A) increases; remains the same 
B) increases; increases 
C) remains the same; increases 
D) remains the same; decreases 
E) decreases; remains the same

Question 15

Which one of the following does NOT occur during the first year of an infant's life?

Accepted Answer

A) grasping of objects 
B) holding head upright 
C) turning of head to follow objects 
D) voluntary thumb sucking 
E) All of these are usually accomplished during an infant's first year. 
A) grasping of objects 
B) holding head upright 
C) turning of head to follow objects 
D) voluntary thumb sucking 
E) All of these are usually accomplished during an infant's first year.

Question 16

Which of the following tissues most likely developed from the mesoderm layer of the embryo?

Accepted Answer

A) the epidermis of the skin 
B) circulatory system 
C) parathyroid 
D) thyroid gland 
E) brain 
A) the epidermis of the skin 
B) circulatory system 
C) parathyroid 
D) thyroid gland 
E) brain

Question 17

Albinism

Accepted Answer

A) occurs if an individual is heterozygous (Aa)or homozygous (aa). 
B) would occur in about half of the children if a heterozygous (Aa)and homozygous (aa)couple had children. 
C) carriers would have the genotype AA. 
D) would occur in all the children of a couple who were (A
A) and (aa). 
E) is an X-linked trait in humans. 
A) occurs if an individual is heterozygous (Aa)or homozygous (aa). 
B) would occur in about half of the children if a heterozygous (Aa)and homozygous (aa)couple had children. 
C) carriers would have the genotype AA. 
D) would occur in all the children of a couple who were (A
A) and (aa). 
E) is an X-linked trait in humans.

Question 18

Gastrulation:

Accepted Answer

A) is the process of cell migration that leads to the formation of the mesoderm 
B) is the union of a sperm cell and oocyte. 
C) is the process by which the trophoblast cells of the blastocyst digests the uterine tissues. 
D) is another name for implantation of the blastocyst 
E) occurs in the fallopian or uterine tubes. 
A) is the process of cell migration that leads to the formation of the mesoderm 
B) is the union of a sperm cell and oocyte. 
C) is the process by which the trophoblast cells of the blastocyst digests the uterine tissues. 
D) is another name for implantation of the blastocyst 
E) occurs in the fallopian or uterine tubes.

Question 19

During the first few days of development,the zygote gets its energy from ________.

Accepted Answer

A) its own yolk 
B) the placenta 
C) the trophoblast 
D) the umbilical cord 
E) the chorion 
A) its own yolk 
B) the placenta 
C) the trophoblast 
D) the umbilical cord 
E) the chorion

Question 20

If a person has two identical genes for a trait,then the person is said to be

Accepted Answer

A) heterozygous for that trait. 
B) homozygous for that trait. 
C) autosomal for that trait. 
D) dominant for that trait. 
E) recessive for that trait. 
A) heterozygous for that trait. 
B) homozygous for that trait. 
C) autosomal for that trait. 
D) dominant for that trait. 
E) recessive for that trait.

Fingers and toes begin to develop _____ days after fertilization.

The stage from the fertilization of the ovum and implantation until the onset of parturition is

Which of the following statements is FALSE?

The middle germ layer is the

A woman is told by her physician that her pregnancy has progressed 44 days since her last menstrual period (LMP).How many days has the embryo been developing?

The chorion (later placenta)secretes

Which one of the following is NOT a polygenic trait?

Which of these organ systems is developed from all three germ layers?

Which of these is NOT a factor that stimulates parturition?

Which of the following statements about death is false?

Males are determined by

During the fetal period of development

Chorionic villi protrude into blood-filled cavities called _____ formed within the maternal endometrium.

During early cell division,the overall size of the zygote while the number of cells ___.

Which one of the following does NOT occur during the first year of an infant's life?

Which of the following tissues most likely developed from the mesoderm layer of the embryo?

Albinism

Gastrulation:

During the first few days of development,the zygote gets its energy from ________.

If a person has two identical genes for a trait,then the person is said to be

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissues

Integumentary System

Skeletal System: Bones and Joints

Muscular System

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

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Exam 20: Development, heredity, and Aging

Fingers and toes begin to develop _____ days after fertilization.

The stage from the fertilization of the ovum and implantation until the onset of parturition is

Which of the following statements is FALSE?

The middle germ layer is the

A woman is told by her physician that her pregnancy has progressed 44 days since her last menstrual period (LMP).How many days has the embryo been developing?

The chorion (later placenta)secretes

Which one of the following is NOT a polygenic trait?

Which of these organ systems is developed from all three germ layers?

Which of these is NOT a factor that stimulates parturition?

Which of the following statements about death is false?

Males are determined by

During the fetal period of development

Chorionic villi protrude into blood-filled cavities called _____ formed within the maternal endometrium.

During early cell division,the overall size of the zygote ________ while the number of cells ___________.

Which one of the following does NOT occur during the first year of an infant's life?

Which of the following tissues most likely developed from the mesoderm layer of the embryo?

Albinism

Gastrulation:

During the first few days of development,the zygote gets its energy from ________.

If a person has two identical genes for a trait,then the person is said to be

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissues

Integumentary System

Skeletal System: Bones and Joints

Muscular System

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Filters

During early cell division,the overall size of the zygote while the number of cells ___.