MCQs 1
1. The chorion is formed by which layers ?
a) cytotrophoblast and somatic extraembryonic mesoderm
b) amnion cells and somatic extraembryonic mesoderm
c) hypoblast cells and splanchnic extraembryonic mesoderm
d) syncytiotropblast and splanchnic extraembryonic mesoderm
2. Identify:
3. The nervous system develops from which germ layer?
a) ectoderm
b) endoderm
c) mesoderm
d) myoderm
4. Which of the following events differ in males and females:
a) duration of meiosis
b) timing of germ cells migration to the gonadal ridge
c) formation of germ cells by mitosis
d) production of follicle stimulating hormone
5. Monozygotic twins resulting from a complete separation at the bilaminar disc stage would expect to have :
a) separate placentae and amniotic cavities
b) a shared placenta and a common amniotic cavity
c) separate placentae but a common amniotic cavity
d) a common amnion, chorion and placenta
6. Which of the following structures would Not have developed from mesoderm?
a) heart
b) kidneys
c) bones
d) liver
7. Identify:
8. Monozygotic twins that form by splitting at the early blastocyst stage possess:
a) Separate amnions, chorions and placentae
b) Separate amnions and chorions but a common placentae
c) a common chorion and placenta but a separate amnion
d) a common amnion but separate chorions and placentae
e) a common amnion, chorion and placenta
9. In oocytes, the second meiotic division is completed
a) during fetal development
b) during the proliferative phase of the menstrual cycle
c) in response to the peak of FSH and LH during the menstrual cycle
d) following fertilization
10. Which of the following structures is derived from the ectoderm?
a) nerves
b) stomach
c) heart
d) lungs
11. Which of the following structures would Not have developed from endoderm?
a) liver
b) spleen
c) thyroid gland
d) pancreas
12. Identify:
13. Which of the following occur during the first week of development?
a) formation of the three germ layers
b) folding of the embryo
c) implantation
d) none of the above
14. Somites, which form segmental muscles and vertebrae, develop from which germ layer?
a) epiderm
b) ectoderm
c) endoderm
d) mesoderm
15. The trophoblast formed during the early stages of human embryology eventually develops into the
a) placenta
b) embryo
c) epiblast
d) morula
16. The placenta develops from
a) fetal membranes only
b) uterine tissue only
c) both fetal and uterine tissue
d) separate polar bodies that develop just the placenta tissue
17. Which of the fiollowing can cross the placenta :
a) cytomegalovirus
b) nicotine
c) syphilis bacteria
d) all of the above
18. Twins which possess a common chorion, placenta but a separate amnion, probably split at stage:
a) Inner cell mass
b) blastocyst
c) Bilaminar disc
d) 2 cell stage
19. The epiblast forms the
a) ectoderm only
b) mesoderm only
c) endoderm only
d) ectoderm and endoderm
20. A zona pellucida can be found surrounding the
a) oocyte
b) 2-cell embryo
c) morula
d) all of the above
21. Which of the following best represents the sequence of events in the formation of the spinal cord ?
a) neural groove, neural tube, neural crest, neural folds
b) neural groove, neural folds, neural crest, neural tube
c) neural folds, neural crest, neural tube, neural groove
d) neural crest, neural folds, neural groove, neural tube
22. Oogonia, derived from primordial germ cells, divide by mitosis during
a) early fetal life
b) postnatal periods after puberty
c) the first two weeks of embryonic development
d) the proliferative phase of the menstrual cycle
23. Which of the following structures gives rise to the placenta?
a) inner cell mass
b) trophoblast
c) hypoblast
d) yolk sac
24. Implantation begins at the end of the
a) fertilization
b) first week
c) second week
d) second month
25. During implantation, the extraembryonic coelom :
a) forms within the extraembryonic mesoderm
b) is lined by somatic and splanchnic extraembryonic mesoderm
c) is obliterated by 22 weeks
d) all of the above
26. Monozygotic twins that form by splitting at the two cell stage possess:
a) Separate amnions, chorions and placentae
b) Separate amnions and chorions but a common placentae
c) A common amnion, chorions but a separate placentae
d) A common amnion but separate chorions and placentae
27. The hormone responsible for ovulation is
a) luteinizing hormone
b) estrogen
c) follicle stimulating hormone
d) human chorionic gonadotrophin.
28. Generally, only one sperm fertilizes an egg because
a) sperm are so few that two are unlikely to arrive at the same time
b) sperm compete against one another before entering, and only the most fit one is accepted
c) one small entry hole called the blastopore allows only one sperm to fit through and then seals
d) when the first sperm membrane fuses with the egg membrane, a barrier to any other sperm forms
29. The bilaminar embryonic disc consists of
a) mesoderm and hypoblast
b) mesoderm and ectoderm
c) epiblast and ectoderm
d) epiblast and endoderm
30. Twins which possess a common amnion, chorion and placenta, probably split at stage:
a) Inner cell mass
b) blastocyst
c) Bilaminar disc
d) 2 cell stage
31. In humans, the developing embryo tends to attach to this structure
a) fallopian tubes
b) endometrium
c) cervix
d) ovary
32. Which part of the blastocyst will develop into the human embryo?
a) blastopore
b) chorion
c) trophoblast
d) inner cell mass
33. Which of the following statements is true ?
a) the anterior neuropore closes on day 27
b) the posterior neuropore closes before the anterior neuropore
c) failure of closure of the anterior neuropore causes anencephaly
d) neural fold closure occurs in a caudal to cranial direction
34. Identify:
35. The neural tube of vertebrates develops during morphogenesis of the nervous system by the
a) folding of ectoderm tissue
b) migration of mesoderm cells
c) fusion of ectoderm and mesoderm
d) extension of endoderm into a thin spiral column
36. The intermediate mesoderm contributes to the
a) urogenital system
b) integument (skin)
c) musculoskeletal system
d) digestive system
37. Oogenesis begins
a) before birth
b) at birth
c) between birth and puberty
d) at puberty
38. The morula
a) consists of 2-cells
b) enters the uterine cavity
c) consists of the trophoblast and the inner cell mass
d) all of the above
39. At gastrulation, the embryo is trilaminar except at:
a) neural folds
b) notochord
c) primitive streak
d) cloacal membrane
40. The series of cellular divisions by which a one cell layered structure becomes a three layer embryo is known as
a) gastrulation
b) cleavage
c) meiosis
c) nondisjunction
MCQs 1 (Answers)
Question 1
0 out of 1 points
The chorion is formed by which layers ?
Answer
Selected Answer:
[None Given]
Correct Answer:
a) cytotrophoblast and somatic extraembryonic mesoderm
Question 2
0 out of 1 points
"Identify [A] [B] [C] [D]"
Specified Answer for: A
[None Given]
Specified Answer for: B
[None Given]
Specified Answer for: C
[None Given]
Specified Answer for: D
[None Given]
Correct Answers for: A
somatic extra-embryonic mesoderm
Correct Answers for: B
chorion
Correct Answers for: C
yolk sac membrane
Correct Answers for: D
amnion
Question 3
0 out of 1 points
The nervous system develops from which germ layer?
Answer
Selected Answer:
[None Given]
Correct Answer:
a) ectoderm
Question 4
0 out of 1 points
Which of the following events differ in males and females:
Answer
Selected Answer:
[None Given]
Correct Answer:
a) duration of meiosis
Question 5
0 out of 1 points
Monozygotic twins resulting from a complete separation at the bilaminar disc stage would expect to have :
Answer
Selected Answer:
[None Given]
Correct Answer:
d) a common amnion, chorion and placenta
Question 6
0 out of 1 points
Which of the following structures would Not have developed from mesoderm?
Answer
Selected Answer:
[None Given]
Correct Answer:
d) liver
Question 7
0 out of 1 points
"Identify [A] [B] [C] [D]"
Specified Answer for: A
[None Given]
Specified Answer for: B
[None Given]
Specified Answer for: C
[None Given]
Specified Answer for: D
[None Given]
Correct Answers for: A
extra-embryonic coelom
Correct Answers for: B
splanchnic extra-embryonic mesoderm
Correct Answers for: C
secondary yolk sac
Correct Answers for: D
amniotic cavity
Question 8
0 out of 1 points
Monozygotic twins that form by splitting at the early blastocyst stage possess:
Answer
Selected Answer:
[None Given]
Correct Answer:
c) a common chorion and placenta but a separate amnion
Question 9
0 out of 1 points
In oocytes, the second meiotic division is completed
Answer
Selected Answer:
[None Given]
Correct Answer:
d) following fertilization
Question 10
0 out of 1 points
Which of the following structures is derived from the ectoderm?
Answer
Selected Answer:
[None Given]
Correct Answer:
a) nerves
Question 11
0 out of 1 points
Which of the following structures would Not have developed from endoderm?
Answer
Selected Answer:
[None Given]
Correct Answer:
b) spleen
Question 12
0 out of 1 points
"Identify:[A] [B] [C] [D]"
Specified Answer for: A
[None Given]
Specified Answer for: B
[None Given]
Specified Answer for: C
[None Given]
Specified Answer for: D
[None Given]
Correct Answers for: A
syncytiotrophoblast
Correct Answers for: B
cytotrophoblast
Correct Answers for: C
amniotic cavity
Correct Answers for: D
extra-embryonic mesoderm
Question 13
0 out of 1 points
Which of the following occur during the first week of development?
Answer
Selected Answer:
[None Given]
Correct Answer:
c) implantation
Question 14
0 out of 1 points
Somites, which form segmental muscles and vertebrae, develop from which germ layer?
Answer
Selected Answer:
[None Given]
Correct Answer:
d) mesoderm
Question 15
0 out of 1 points
The trophoblast formed during the early stages of human embryology eventually develops into the
Answer
Selected Answer:
[None Given]
Correct Answer:
a) placenta
Question 16
0 out of 1 points
The placenta develops from
Answer
Selected Answer:
[None Given]
Correct Answer:
c) both fetal and uterine tissue
Question 17
0 out of 1 points
Which of the fiollowing can cross the placenta :
Answer
Selected Answer:
[None Given]
Correct Answer:
d) all of the above
Question 18
0 out of 1 points
Twins which possess a common chorion, placenta but a separate amnion, probably split at stage:
Answer
Selected Answer:
[None Given]
Correct Answer:
a) Inner cell mass
Question 19
0 out of 1 points
The epiblast forms the
Answer
Selected Answer:
[None Given]
Correct Answer:
a) ectoderm only
Question 20
0 out of 1 points
A zona pellucida can be found surrounding the
Answer
Selected Answer:
[None Given]
Correct Answer:
d) all of the above
Question 21
0 out of 1 points
Which of the following best represents the sequence of events in the formation of the spinal cord ?
Answer
Selected Answer:
[None Given]
Correct Answer:
b) neural groove, neural folds, neural crest, neural tube
Question 22
0 out of 1 points
Oogonia, derived from primordial germ cells, divide by mitosis during
Answer
Selected Answer:
Correct Answer:
[None Given]
a) early fetal life
Question 23
0 out of 1 points
Which of the following structures gives rise to the placenta?
Answer
Selected Answer:
[None Given]
Correct Answer:
b) trophoblast
Question 24
0 out of 1 points
Implantation begins at the end of the
Answer
Selected Answer:
[None Given]
Correct Answer:
b) first week
Question 25
0 out of 1 points
During implantation, the extraembryonic coelom :
Answer
Selected Answer:
[None Given]
Correct Answer:
d) all of the above
Question 26
0 out of 1 points
Monozygotic twins that form by splitting at the two cell stage possess:
Answer
Selected Answer:
[None Given]
Correct Answer:
a) Separate amnions, chorions and placentae
Question 27
0 out of 1 points
The hormone responsible for ovulation is
Answer
Selected Answer:
[None Given]
Correct Answer:
a) luteinizing hormone
Question 28
0 out of 1 points
Generally, only one sperm fertilizes an egg because
Answer
Selected
Answer:
Correct
Answer:
[None Given]
d) when the first sperm membrane fuses with the egg membrane, a barrier to any other
sperm forms
Question 29
0 out of 1 points
The bilaminar embryonic disc consists of
Answer
Selected Answer:
[None Given]
Correct Answer:
d) epiblast and endoderm
Question 30
0 out of 1 points
Twins which possess a common amnion, chorion and placenta, probably split at stage:
Answer
Selected Answer:
[None Given]
Correct Answer:
c) Bilaminar disc
Question 31
0 out of 1 points
In humans, the developing embryo tends to attach to this structure
Answer
Selected Answer:
[None Given]
Correct Answer:
b) endometrium
Question 32
0 out of 1 points
Which part of the blastocyst will develop into the human embryo?
Answer
Selected Answer:
[None Given]
Correct Answer:
d) inner cell mass
Question 33
0 out of 1 points
Which of the following statements is true ?
Answer
Selected Answer:
[None Given]
Correct Answer:
c) failure of closure of the anterior neuropore causes anencephaly
Question 34
0 out of 1 points
"Identify [A] [B] [C] [D]"
Specified Answer for: A
[None Given]
Specified Answer for: B
[None Given]
Specified Answer for: C
[None Given]
Specified Answer for: D
[None Given]
Correct Answers for: A
epiblast
Correct Answers for: B
primary yolk sac
Correct Answers for: C
hypoblast
Correct Answers for: D
amnion
Question 35
0 out of 1 points
The neural tube of vertebrates develops during morphogenesis of the nervous system by the
Answer
Selected Answer:
[None Given]
Correct Answer:
a) folding of ectoderm tissue
Question 36
0 out of 1 points
The intermediate mesoderm contributes to the
Answer
Selected Answer:
[None Given]
Correct Answer:
a) urogenital system
Question 37
0 out of 1 points
Oogenesis begins
Answer
Selected Answer:
[None Given]
Correct Answer:
a) before birth
Question 38
0 out of 1 points
The morula
Answer
Selected Answer:
[None Given]
Correct Answer:
b) enters the uterine cavity
Question 39
0 out of 1 points
At gastrulation, the embryo is trilaminar except at:
Answer
Selected Answer:
[None Given]
Correct Answer:
d) cloacal membrane
Question 40
0 out of 1 points
The series of cellular divisions by which a one cell layered structure becomes a three layer embryo is known
as
Answer
Selected Answer:
[None Given]
Correct Answer:
a) gastrulation