Question 1

This figure shows

Accepted Answer

A) a zygote. 
B) the morula. 
C) a blastocyst. 
D) an embryo. 
A) a zygote. 
B) the morula. 
C) a blastocyst. 
D) an embryo. C

Question 2

A drug that would stop the production of milk in the breast after a few days probably has which effect?

Accepted Answer

A) inhibition of prolactin secretion 
B) inhibition of oxytocin secretion 
C) increased estrogen secretion 
D) increased progesterone secretion 
E) increased oxytocin secretion 
A) inhibition of prolactin secretion 
B) inhibition of oxytocin secretion 
C) increased estrogen secretion 
D) increased progesterone secretion 
E) increased oxytocin secretion A

Question 3

The heart begins to beat _____ days after fertilization.

Accepted Answer

A) 11-15 
B) 21-25 
C) 31-35 
D) 41-45 
E) 51-55 
A) 11-15 
B) 21-25 
C) 31-35 
D) 41-45 
E) 51-55 B

Question 4

Which of these statements concerning the neural tube is NOT correct?

Accepted Answer

A) The neural tube is formed from fusion of the neural folds. 
B) The neural tube is composed of cells called neuroectoderm. 
C) The brain and spinal cord are derived from the neural tube. 
D) The cells of the neural tube itself are called neural crest cells. 
E) The neural tube is formed from ectoderm. 
A) The neural tube is formed from fusion of the neural folds. 
B) The neural tube is composed of cells called neuroectoderm. 
C) The brain and spinal cord are derived from the neural tube. 
D) The cells of the neural tube itself are called neural crest cells. 
E) The neural tube is formed from ectoderm.

Question 5

The second meiotic division of the oocyte occurs

Accepted Answer

A) prior to ovulation. 
B) immediately after ovulation. 
C) just prior to fertilization. 
D) after a sperm cell enters it. 
E) after mitotic division starts. 
A) prior to ovulation. 
B) immediately after ovulation. 
C) just prior to fertilization. 
D) after a sperm cell enters it. 
E) after mitotic division starts.

Question 6

The embryonic disk

Accepted Answer

A) is composed of two layers of cells. 
B) is produced when the amniotic cavity forms. 
C) initially contains ectoderm and endoderm. 
D) develops a primitive streak. 
E) has all of these properties. 
A) is composed of two layers of cells. 
B) is produced when the amniotic cavity forms. 
C) initially contains ectoderm and endoderm. 
D) develops a primitive streak. 
E) has all of these properties.

Question 7

Of the 46 chromosomes in human cells,_____ are autosomes,and _____ are sex chromosomes.

Accepted Answer

A) 38,8 
B) 40,6 
C) 42,4 
D) 44,2 
E) 43,1 
A) 38,8 
B) 40,6 
C) 42,4 
D) 44,2 
E) 43,1

Question 8

If two parents that are carriers for albinism mate,the possible outcome for having a child that is an albino is

Accepted Answer

A) 100%. 
B) 75%. 
C) 50%. 
D) 25%. 
E) 0%. 
A) 100%. 
B) 75%. 
C) 50%. 
D) 25%. 
E) 0%.

Question 9

The thyroid gland begins 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 10

Which of these changes occur in the fetus at the time of birth?

Accepted Answer

A) the lungs inflate 
B) increased resistance to blood flow through the lungs occurs 
C) the umbilical vein becomes the ductus venosus 
D) the umbilical arteries become the ligamentum arteriosum 
E) the foramen ovale becomes the round ligament 
A) the lungs inflate 
B) increased resistance to blood flow through the lungs occurs 
C) the umbilical vein becomes the ductus venosus 
D) the umbilical arteries become the ligamentum arteriosum 
E) the foramen ovale becomes the round ligament

Question 11

The fluid-filled cavity in the blastocyst is called the

Accepted Answer

A) trophoblast. 
B) blastocele. 
C) inner cell mass. 
D) chorion. 
E) lacunae. 
A) trophoblast. 
B) blastocele. 
C) inner cell mass. 
D) chorion. 
E) lacunae.

Question 12

During the second to the eighth week of development,during which the organ systems are developed,the developing individual is known as the

Accepted Answer

A) blastocyst or pre-embryo. 
B) neonate. 
C) embryo. 
D) infant. 
E) fetus. 
A) blastocyst or pre-embryo. 
B) neonate. 
C) embryo. 
D) infant. 
E) fetus.

Question 13

During meiosis,homologous chromosomes may exchange genetic information by ________________.

Accepted Answer

A) becoming sex linked 
B) changing to heterozygous chromosomes 
C) crossing over 
D) trisomy 
E) both changing to heterozygous chromosomes and trisomy 
A) becoming sex linked 
B) changing to heterozygous chromosomes 
C) crossing over 
D) trisomy 
E) both changing to heterozygous chromosomes and trisomy

Question 14

The cells of the ______ become the chorion.

Accepted Answer

A) trophoblast 
B) inner cell mass 
C) blastocele 
D) placenta 
E) amnion 
A) trophoblast 
B) inner cell mass 
C) blastocele 
D) placenta 
E) amnion

Question 15

The trophoblast

Accepted Answer

A) forms the embryonic part of the placenta and other membranes. 
B) cells digest the uterine tissues to allow implantation. 
C) becomes the chorion. 
D) is a single layer of cells around the blastocele. 
E) All of these are correct. 
A) forms the embryonic part of the placenta and other membranes. 
B) cells digest the uterine tissues to allow implantation. 
C) becomes the chorion. 
D) is a single layer of cells around the blastocele. 
E) All of these are correct.

Question 16

Fraternal twins

Accepted Answer

A) are also called monozygotic twins. 
B) develop from only one secondary oocyte that separates early in cell division. 
C) have identical genetic make-ups. 
D) arises from the ovulation of more than one secondary oocyte at the same time. 
E) All of these are correct. 
A) are also called monozygotic twins. 
B) develop from only one secondary oocyte that separates early in cell division. 
C) have identical genetic make-ups. 
D) arises from the ovulation of more than one secondary oocyte at the same time. 
E) All of these are correct.

Question 17

Which of these is NOT a structure formed from neural crest cells?

Accepted Answer

A) part of peripheral nervous system 
B) spinal cord 
C) melanocytes 
D) facial bones 
E) dentin of teeth 
A) part of peripheral nervous system 
B) spinal cord 
C) melanocytes 
D) facial bones 
E) dentin of teeth

Question 18

During the first two weeks of development the developing individual is known as the

Accepted Answer

A) blastocyst or pre-embryo. 
B) neonate. 
C) embryo. 
D) infant. 
E) fetus. 
A) blastocyst or pre-embryo. 
B) neonate. 
C) embryo. 
D) infant. 
E) fetus.

Question 19

During pregnancy,

Accepted Answer

A) estrogens and progesterone cause production of milk. 
B) additional adipose tissue is deposited in the breast. 
C) prolactin stimulates the release of progesterone. 
D) oxytocin prevents premature milk release. 
E) all of these interactions occur. 
A) estrogens and progesterone cause production of milk. 
B) additional adipose tissue is deposited in the breast. 
C) prolactin stimulates the release of progesterone. 
D) oxytocin prevents premature milk release. 
E) all of these interactions occur.

Question 20

The line on the figure designated by the letter A represents

Accepted Answer

A) progesterone. 
B) estrogen. 
C) testosterone. 
D) HCG. 
E) oxytocin. 
A) progesterone. 
B) estrogen. 
C) testosterone. 
D) HCG. 
E) oxytocin.

This figure shows

A drug that would stop the production of milk in the breast after a few days probably has which effect?

The heart begins to beat _____ days after fertilization.

Which of these statements concerning the neural tube is NOT correct?

The second meiotic division of the oocyte occurs

The embryonic disk

Of the 46 chromosomes in human cells,_ are autosomes,and _ are sex chromosomes.

If two parents that are carriers for albinism mate,the possible outcome for having a child that is an albino is

The thyroid gland begins to develop _____ days after fertilization.

Which of these changes occur in the fetus at the time of birth?

The fluid-filled cavity in the blastocyst is called the

During the second to the eighth week of development,during which the organ systems are developed,the developing individual is known as the

During meiosis,homologous chromosomes may exchange genetic information by ________________.

The cells of the ______ become the chorion.

The trophoblast

Fraternal twins

Which of these is NOT a structure formed from neural crest cells?

During the first two weeks of development the developing individual is known as the

During pregnancy,

The line on the figure designated by the letter A represents

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

Exam 20: Development, heredity, and Aging

This figure shows

A drug that would stop the production of milk in the breast after a few days probably has which effect?

The heart begins to beat _____ days after fertilization.

Which of these statements concerning the neural tube is NOT correct?

The second meiotic division of the oocyte occurs

The embryonic disk

Of the 46 chromosomes in human cells,_____ are autosomes,and _____ are sex chromosomes.

If two parents that are carriers for albinism mate,the possible outcome for having a child that is an albino is

The thyroid gland begins to develop _____ days after fertilization.

Which of these changes occur in the fetus at the time of birth?

The fluid-filled cavity in the blastocyst is called the

During the second to the eighth week of development,during which the organ systems are developed,the developing individual is known as the

During meiosis,homologous chromosomes may exchange genetic information by ________________.

The cells of the ______ become the chorion.

The trophoblast

Fraternal twins

Which of these is NOT a structure formed from neural crest cells?

During the first two weeks of development the developing individual is known as the

During pregnancy,

The line on the figure designated by the letter A represents

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

Of the 46 chromosomes in human cells,_ are autosomes,and _ are sex chromosomes.