Question 1

The fetal portion of the placenta forms from the

Accepted Answer

A) amnion. 
B) yolk sac. 
C) inner cell mass. 
D) chorion. 
E) blastocoel. 
A) amnion. 
B) yolk sac. 
C) inner cell mass. 
D) chorion. 
E) blastocoel.

Question 2

What would happen if more than one sperm penetrated a secondary oocyte,an event termed polyspermy?

Accepted Answer

A) Identical twins would result. 
B) The sperm with the most advanced chromosomes would merge with the female nucleus. 
C) The extra sperm would most likely fertilize one of the polar bodies. 
D) The resulting zygote would not develop. 
E) This never happens due to genetic controls. 
A) Identical twins would result. 
B) The sperm with the most advanced chromosomes would merge with the female nucleus. 
C) The extra sperm would most likely fertilize one of the polar bodies. 
D) The resulting zygote would not develop. 
E) This never happens due to genetic controls.

Question 3

A major difference between oogenesis and spermatogenesis is that each cycle of oogenesis results in

Accepted Answer

A) four viable eggs,whereas a single cycle of spermatogenesis produces only one sperm. 
B) three viable eggs,whereas a single cycle of spermatogenesis produces only one sperm. 
C) only one viable egg,whereas a single cycle of spermatogenesis produces four spermatozoa. 
D) three viable polar bodies,whereas a single cycle of spermatogenesis produces no polar bodies. 
E) a tiny viable egg,whereas a single cycle of spermatogenesis produces four sperm,each much larger than the egg. 
A) four viable eggs,whereas a single cycle of spermatogenesis produces only one sperm. 
B) three viable eggs,whereas a single cycle of spermatogenesis produces only one sperm. 
C) only one viable egg,whereas a single cycle of spermatogenesis produces four spermatozoa. 
D) three viable polar bodies,whereas a single cycle of spermatogenesis produces no polar bodies. 
E) a tiny viable egg,whereas a single cycle of spermatogenesis produces four sperm,each much larger than the egg.

Question 4

The amnion is one of the extraembryonic membranes,and its function is to

Accepted Answer

A) prevent desiccation of the embryo. 
B) allow fluid to enter the placenta. 
C) form the plasma portion of the blood. 
D) give the embryo nourishment. 
E) permit implantation to occur. 
A) prevent desiccation of the embryo. 
B) allow fluid to enter the placenta. 
C) form the plasma portion of the blood. 
D) give the embryo nourishment. 
E) permit implantation to occur.

Question 5

Reduction division occurs during

Accepted Answer

A) mitosis. 
B) meiosis. 
C) both mitosis and meiosis. 
A) mitosis. 
B) meiosis. 
C) both mitosis and meiosis.

Question 6

What happens to the polar bodies that are produced during oogenesis?

Accepted Answer

A) They participate in the formation of the extra-embryonic membranes. 
B) They provide yolk to nourish the early embryo. 
C) They help to form the placenta. 
D) They degenerate. 
E) They are incorporated into the inner cell mass. 
A) They participate in the formation of the extra-embryonic membranes. 
B) They provide yolk to nourish the early embryo. 
C) They help to form the placenta. 
D) They degenerate. 
E) They are incorporated into the inner cell mass.

Question 7

From which primary germ layer is the thyroid gland derived?

Accepted Answer

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

Question 8

Trisomy refers to

Accepted Answer

A) the development of three primary germ layers. 
B) three layers of cells. 
C) the formation of triplets. 
D) there being three copies of a given chromosome instead of two. 
E) the formation of the three extra-embryonic membranes. 
A) the development of three primary germ layers. 
B) three layers of cells. 
C) the formation of triplets. 
D) there being three copies of a given chromosome instead of two. 
E) the formation of the three extra-embryonic membranes.

Question 9

During this critical period the subcutaneous fat is deposited and testes descend into the scrotum.

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 10

At its formation,a morula consists of ______ cells.

Accepted Answer

A) 4 
B) 8 
C) 16 
D) 32 
E) 64 
A) 4 
B) 8 
C) 16 
D) 32 
E) 64

Question 11

Neurulation is an example of

Accepted Answer

A) compaction. 
B) blastulation. 
C) gastrulation. 
D) induction. 
E) organogenesis. 
A) compaction. 
B) blastulation. 
C) gastrulation. 
D) induction. 
E) organogenesis.

Question 12

When does the embryonic period officially begin?

Accepted Answer

A) With the onset of cleavage 
B) At the time of implantation 
C) With the establishment of the three primary germ layers 
D) When the umbilical cord becomes functional 
E) At fertilization 
A) With the onset of cleavage 
B) At the time of implantation 
C) With the establishment of the three primary germ layers 
D) When the umbilical cord becomes functional 
E) At fertilization

Question 13

The process of embryogenesis includes

Accepted Answer

A) gastrulation. 
B) fertilization. 
C) gametogenesis. 
D) formation of a zygote. 
A) gastrulation. 
B) fertilization. 
C) gametogenesis. 
D) formation of a zygote.

Question 14

Formation of the neural tube

Accepted Answer

A) begins at the anterior (head)end and proceeds toward the posterior (tail). 
B) begins at the posterior and proceeds toward the anterior. 
C) begins in the middle and proceeds toward the head and the tail. 
D) is random in that it can begin and proceed at any location along the neural plate. 
E) is caused by compaction of the neural plate. 
A) begins at the anterior (head)end and proceeds toward the posterior (tail). 
B) begins at the posterior and proceeds toward the anterior. 
C) begins in the middle and proceeds toward the head and the tail. 
D) is random in that it can begin and proceed at any location along the neural plate. 
E) is caused by compaction of the neural plate.

Question 15

Two standard measurements are used to determine fetal length.Which of these would be the longer of the two measurements on any normal fetus?

Accepted Answer

A) CHL 
B) CRL 
C) HTL 
D) HRL 
E) CFL 
A) CHL 
B) CRL 
C) HTL 
D) HRL 
E) CFL

Question 16

A double-stranded chromosome consists of two genetically identical sister chromatids.What important biological event produced the sister chromatids?

Accepted Answer

A) Crossing over 
B) Genetic mutation 
C) Mitosis 
D)  DNA replication 
E) Reduction division 
A) Crossing over 
B) Genetic mutation 
C) Mitosis 
D)  DNA replication 
E) Reduction division

Question 17

From which primary germ layer is the nervous system derived?

Accepted Answer

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

Question 18

The secondary oocyte enters into an arrested state during its development.In what stage of development does this occur?

Accepted Answer

A) During metaphase I 
B) During telophase I 
C) During prophase II 
D) During metaphase II 
E) During telophase II 
A) During metaphase I 
B) During telophase I 
C) During prophase II 
D) During metaphase II 
E) During telophase II

Question 19

Differentiation refers to the

Accepted Answer

A) moment of conception (when sperm and egg unite). 
B) time when the blastocyst implants in the uterine wall. 
C) formation and organization of the diverse cell types in the body. 
D) formation of the various organ systems in the body. 
E) separation of the placenta from the fetus at birth. 
A) moment of conception (when sperm and egg unite). 
B) time when the blastocyst implants in the uterine wall. 
C) formation and organization of the diverse cell types in the body. 
D) formation of the various organ systems in the body. 
E) separation of the placenta from the fetus at birth.

Question 20

This figure shows a superior view of the developing embryo.What structure does number 1 indicate?

Accepted Answer

A) Yolk sac 
B) Notochord 
C) Primitive streak 
D) Epiblast 
E) Hypoblast 
A) Yolk sac 
B) Notochord 
C) Primitive streak 
D) Epiblast 
E) Hypoblast

Exam 3: Embryology

The fetal portion of the placenta forms from the

What would happen if more than one sperm penetrated a secondary oocyte,an event termed polyspermy?

A major difference between oogenesis and spermatogenesis is that each cycle of oogenesis results in

The amnion is one of the extraembryonic membranes,and its function is to

Reduction division occurs during

What happens to the polar bodies that are produced during oogenesis?

From which primary germ layer is the thyroid gland derived?

Trisomy refers to

During this critical period the subcutaneous fat is deposited and testes descend into the scrotum.

At its formation,a morula consists of ______ cells.

Neurulation is an example of

When does the embryonic period officially begin?

The process of embryogenesis includes

Formation of the neural tube

Two standard measurements are used to determine fetal length.Which of these would be the longer of the two measurements on any normal fetus?

A double-stranded chromosome consists of two genetically identical sister chromatids.What important biological event produced the sister chromatids?

From which primary germ layer is the nervous system derived?

The secondary oocyte enters into an arrested state during its development.In what stage of development does this occur?

Differentiation refers to the

This figure shows a superior view of the developing embryo.What structure does number 1 indicate?

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