Question 1

Which is not correct concerning cephalocaudal folding of the embryonic disc?

Accepted Answer

A) It occurs before the primary germ layers have formed. 
B) It occurs in the cephalic and caudal regions of the embryo. 
C) It occurs because of differential growth in different regions of the embryonic disc. 
D) It occurs during the late third and fourth weeks of development. 
E) It helps create the future head and buttocks regions of the embryo. 
A) It occurs before the primary germ layers have formed. 
B) It occurs in the cephalic and caudal regions of the embryo. 
C) It occurs because of differential growth in different regions of the embryonic disc. 
D) It occurs during the late third and fourth weeks of development. 
E) It helps create the future head and buttocks regions of the embryo.

Question 2

What is capacitation?

Accepted Answer

A) Another term for fertilization 
B) Implantation of the embryo into the uterine wall 
C) Movement of the fertilized egg down the fallopian tube 
D) Release of the secondary oocyte from the ovary 
E) Conditioning of the sperm within the female reproductive tract 
A) Another term for fertilization 
B) Implantation of the embryo into the uterine wall 
C) Movement of the fertilized egg down the fallopian tube 
D) Release of the secondary oocyte from the ovary 
E) Conditioning of the sperm within the female reproductive tract

Question 3

In what developmental stage does the human embryo implant in the wall of the uterus?

Accepted Answer

A) As a zygote 
B) In the morula stage 
C) In the blastocyst stage 
D) In the gastrula stage 
E) During organogenesis 
A) As a zygote 
B) In the morula stage 
C) In the blastocyst stage 
D) In the gastrula stage 
E) During organogenesis

Question 4

Down syndrome is the result of

Accepted Answer

A) improper crossing over. 
B) nondisjunction. 
C) improper implantation. 
D) incomplete capacitation. 
E) disassociation. 
A) improper crossing over. 
B) nondisjunction. 
C) improper implantation. 
D) incomplete capacitation. 
E) disassociation.

Question 5

The event called "crossing over" in meiosis results in

Accepted Answer

A) greater genetic variety in sex cells and thus in embryos. 
B) less genetic variety in sex cells. 
C) greater vitality of sex cells making them more active. 
D) a change in the gender (sex)of the embryo. 
E) irreversible mutations. 
A) greater genetic variety in sex cells and thus in embryos. 
B) less genetic variety in sex cells. 
C) greater vitality of sex cells making them more active. 
D) a change in the gender (sex)of the embryo. 
E) irreversible mutations.

Question 6

During which fetal stage do reproductive organs and permanent kidneys begin to develop?

Accepted Answer

A) Weeks 1-8 
B) Weeks 9-12 
C) Weeks 13-16 
D) Weeks 17-20 
E) Weeks 21-38 
A) Weeks 1-8 
B) Weeks 9-12 
C) Weeks 13-16 
D) Weeks 17-20 
E) Weeks 21-38

Question 7

What happens during gastrulation?

Accepted Answer

A) The three primary germ layers are formed. 
B) The embryo implants in the wall of the uterus. 
C) The placenta becomes functional. 
D) The chorion disintegrates. 
E) The amnionic fluid appears. 
A) The three primary germ layers are formed. 
B) The embryo implants in the wall of the uterus. 
C) The placenta becomes functional. 
D) The chorion disintegrates. 
E) The amnionic fluid appears.

Question 8

From which primary germ layer is the dermis of the skin derived?

Accepted Answer

A) Ectoderm 
B) Mesoderm 
C) Endoderm 
A) Ectoderm 
B) Mesoderm 
C) Endoderm

Question 9

The correct chronological pathway of fertilization is

Accepted Answer

A) zona pellucida penetration $\rightarrow$ corona radiata penetration $\rightarrow$ pronuclei fusion. 
B) corona radiata penetration $\rightarrow$ zona pellucida penetration $\rightarrow$ pronuclei fusion. 
C) pronuclei fusion $\rightarrow$ corona radiata penetration $\rightarrow$ zona pellucida penetration. 
D) pronuclei fusion $\rightarrow$ zona pellucida penetration $\rightarrow$ corona radiata penetration. 
E) corona radiata penetration $\rightarrow$ pronuclei fusion $\rightarrow$ zona pellucida penetration. 
A) zona pellucida penetration $\rightarrow$ corona radiata penetration $\rightarrow$ pronuclei fusion. 
B) corona radiata penetration $\rightarrow$ zona pellucida penetration $\rightarrow$ pronuclei fusion. 
C) pronuclei fusion $\rightarrow$ corona radiata penetration $\rightarrow$ zona pellucida penetration. 
D) pronuclei fusion $\rightarrow$ zona pellucida penetration $\rightarrow$ corona radiata penetration. 
E) corona radiata penetration $\rightarrow$ pronuclei fusion $\rightarrow$ zona pellucida penetration.

Question 10

The number of possible combinations of genes in humans is virtually limitless.One reason is random assortment of chromosomes and the other is

Accepted Answer

A) random mating. 
B) crossing over. 
C) reduction division. 
D) nondisjunction. 
E) spermiogenesis. 
A) random mating. 
B) crossing over. 
C) reduction division. 
D) nondisjunction. 
E) spermiogenesis.

Question 11

During this fetal stage,lanugo covers the skin and the limbs near their final proportions.

Accepted Answer

A) Weeks 1-8 
B) Weeks 9-12 
C) Weeks 13-16 
D) Weeks 17-20 
E) Weeks 21-38 
A) Weeks 1-8 
B) Weeks 9-12 
C) Weeks 13-16 
D) Weeks 17-20 
E) Weeks 21-38

Question 12

The number of chromosomes in a secondary oocyte is

Accepted Answer

A) greater than the number in a mature sperm. 
B) less than the number in a mature sperm. 
C) the same as the number in a mature sperm. 
D) greater than the number in a polar body. 
E) less than the number in a polar body. 
A) greater than the number in a mature sperm. 
B) less than the number in a mature sperm. 
C) the same as the number in a mature sperm. 
D) greater than the number in a polar body. 
E) less than the number in a polar body.

Question 13

Some estimates claim that approximately ______ percent of all pregnancies result in spontaneous abortion,many due to chromosomal abnormalities.

Accepted Answer

A) 10 
B) 20 
C) 30 
D) 40 
E) 50 
A) 10 
B) 20 
C) 30 
D) 40 
E) 50

Question 14

The two items that form protective layers around the secondary oocyte are the zona pellucida and

Accepted Answer

A) polar body. 
B) transverse membrane. 
C)  corona radiata. 
D) acrosome. 
E) primary oocyte. 
A) polar body. 
B) transverse membrane. 
C)  corona radiata. 
D) acrosome. 
E) primary oocyte.

Question 15

A polar body is formed during

Accepted Answer

A) mitosis. 
B) meiosis I. 
C) meiosis II. 
D) meiosis I and meiosis II. 
E) ovulation. 
A) mitosis. 
B) meiosis I. 
C) meiosis II. 
D) meiosis I and meiosis II. 
E) ovulation.

Question 16

The hormone hCG (human chorionic gonadotropin)is produced by the

Accepted Answer

A) chorion. 
B) cytotrophoblast. 
C) endometrium. 
D) corpus luteum. 
E) syncytiotrophoblast. 
A) chorion. 
B) cytotrophoblast. 
C) endometrium. 
D) corpus luteum. 
E) syncytiotrophoblast.

Question 17

Of the millions of sperm deposited into the vagina during intercourse,only a few hundred reach the secondary oocyte.What happens to the rest?

Accepted Answer

A) Many leak out of the vagina. 
B) Some never become motile. 
C) They may be destroyed by the acidic environment of the female tract. 
D) They may become disoriented and lose direction. 
E) All of the choices are correct. 
A) Many leak out of the vagina. 
B) Some never become motile. 
C) They may be destroyed by the acidic environment of the female tract. 
D) They may become disoriented and lose direction. 
E) All of the choices are correct.

Question 18

The function of the chorion is to

Accepted Answer

A) prevent desiccation of the embryo. 
B) assist in the formation of the circulatory system. 
C) form red blood cells. 
D) aid in the formation of the placenta. 
E) cover the embryo in a protective layer of mucus. 
A) prevent desiccation of the embryo. 
B) assist in the formation of the circulatory system. 
C) form red blood cells. 
D) aid in the formation of the placenta. 
E) cover the embryo in a protective layer of mucus.

Question 19

From which primary germ layer is the epidermis of the skin derived?

Accepted Answer

A) Ectoderm 
B) Mesoderm 
C) Endoderm 
A) Ectoderm 
B) Mesoderm 
C) Endoderm

Question 20

The formation of sex cells in the human is termed

Accepted Answer

A) gametogenesis. 
B) karyogenesis. 
C) sporogenesis. 
D) typogenesis. 
E) differentiation. 
A) gametogenesis. 
B) karyogenesis. 
C) sporogenesis. 
D) typogenesis. 
E) differentiation.

Exam 3: Embryology

Which is not correct concerning cephalocaudal folding of the embryonic disc?

What is capacitation?

In what developmental stage does the human embryo implant in the wall of the uterus?

Down syndrome is the result of

The event called "crossing over" in meiosis results in

During which fetal stage do reproductive organs and permanent kidneys begin to develop?

What happens during gastrulation?

From which primary germ layer is the dermis of the skin derived?

The correct chronological pathway of fertilization is

The number of possible combinations of genes in humans is virtually limitless.One reason is random assortment of chromosomes and the other is

During this fetal stage,lanugo covers the skin and the limbs near their final proportions.

The number of chromosomes in a secondary oocyte is

Some estimates claim that approximately ______ percent of all pregnancies result in spontaneous abortion,many due to chromosomal abnormalities.

The two items that form protective layers around the secondary oocyte are the zona pellucida and

A polar body is formed during

The hormone hCG (human chorionic gonadotropin)is produced by the

Of the millions of sperm deposited into the vagina during intercourse,only a few hundred reach the secondary oocyte.What happens to the rest?

The function of the chorion is to

From which primary germ layer is the epidermis of the skin derived?

The formation of sex cells in the human is termed

A First Look at Anatomy

The Celt Basic Unit of Structure and Function

Tissue Level of Organization

Integumentary System

Cartilage and Bone

Axial Skeleton

Appendicular Skeleton

Articulations

Muscle Tissue and Organization

Axial Muscles

Appendicular Muscles

Surface Anatomy

Nervous Tissue

Brain and Cranial Nerves

Spinal Cord and Spinal Nerves

Pathways and Integrative Functions

Autonomic Nervous System

Senses: General and Special

Endocrine System

Blood

Heart

Vessels and Circulation

Lymphatic System

Respiratory System

Digestive System

Urinary System

Reproductive System

Filters