Histology MCQs/General Embryology

Calf embryo about 1 month in the amniotic sac.

1 All but one of following statements about the cleavage are true. Which of them is false?

	Cleavage occurs when the embryo travels through the Fallopian tube
	During cleavage, the amount of DNA inside the embryo increases
	Embryo is closed inside zona pellucida during cleavage
	Cleavage continues after implantation

2 All but one of the following statements are true. Which of them is false?

	Number of oogonia grows especially during puberty
	Common fate of oogonia is death by apoptosis
	Oogonia are able undergo mitotic division
	Oogonia are diploid cells

3 Whati is an allantois? (Possible formulation is also: "Allantois:")

	Finger-like protrusion in the site of pharyngeal membrane
	Finger-like protrusion in the site of syncytiotrophoblast
	Finger-like protrusion in the site of cloak membrane
	Finger-like protrusion in the site of cytotrophoblast

4 Which statement about the amniotic sac is true? (Possible formulation is also: "Amniotic sac:")

	It is lined up by cells of ectoderm from its beginning
	It is lined up by cells of endoderm from its beginning
	It is composed of cells derived from the epiblast
	It disappears completely during the second week

5 Which structures form the bilaminar germ disk?

	Mesoderm and mesenchyme
	Epiblast and hypoblast
	Endoderm and ektoderm
	Laurel and Hardy

6 Which embryonic structure gives rise to cells in our bodies? (note: you can assume "the majority of cells" instead of "all cells" as the application of the rule "the best-fitting answer is correct")

	Both epiblast and hypoblast
	Hypoblast
	Epiblast

7 Chorda dorsalis (dorsal chord) is a source of signaling molecules driving the development of: (note: Instead of "driving", words like "controlling" or "checking" can be used in the same meaning)

	Axial structures
	Umbilical cord
	Placenta
	Hearth

8 Chorda dorsalis (dorsal chord):

	Completely disappears during prenatal life
	Is fully preserved nearly till the birth
	Is a solid chord composed of cells
	Is the tubular structure

9 When start differentiation of somites (somitogenesis)?

	In 3rd week
	In 4th week
	In 5th week
	In 6th week

10 Does the morula change its volume in the Fallopian tube?

	Yes, the volume undergoes three to five cycles of changes
	Yes, the volume decreases
	Yes, the volume increases
	No, the volume does not change

11 Ductus venosus (Arantii): (note: This short formulation means: "Select correct or best-fitting statement about the structure")

	Originates as the connection of anterior and posterior cardinal veins
	Connects umbilical vein with inferior caval vein
	Is the venous side of the primitive heart tube
	Gives rise to the portal vein

12 Which statement about 'formation of somites is correct?

	Formation of somites is gradual: Cranial somites start, caudal somites continue later on
	Formation of somites is gradual: Caudal somites start, cranial somites continue later on
	Timing of formation of somites is less or more chaotic
	All somites are formed at the same time

13 When can be recognized germ line for gametes?

	In the 4th week of embryonic development
	In the 4th month of embryonic development
	In the 4th month after bird
	In the 4th year after bird

14 How to describe the origin of the intraembryonic mesoderm?

	Cells from the primitive node (node of Henlen) migrate between ectoderm and endoderm
	Cells from the wall of the amnionic sack migrate between ectoderm and endoderm
	Cells from the wall of the yolk sack migrate between ectoderm and endoderm
	Cells from primitive streak migrate between ectoderm and endoderm

15 When starts the implantation?

	Immediately after fertilization
	3rd day after fertilization
	6th day after fertilization
	9th day after fertilization

16 Journey of the morula through the Fallopian tupe takes usually:

	1 to 2 days
	3 to 4 days
	5 to 7 days
	8 to 10 days

17 Only one statement about ' origin of gametes is true. Which one?

	They originate from different type of cells, which is not mentioned here
	They originate from either spermatogonia or oogonia
	They originate from spermatogonia only
	They originate from oogonia only

18 Paraxial mesoderm give rise:

	Both somatopleura and splanchnopleura
	Intermediate mesoderm
	Chordal plate
	Somits

19 What is a prechordal plate?

	Ventral thickening of endoderm
	Ventral thickening of ectoderm
	Dorsal thickening of endoderm
	Dorsal thickening of ectoderm

20 Which structure delineates the primary yolk sack?

	Heuser's membrane
	Splanchnopleura
	Trophoblast
	Mesoderm

21 Primitive node (node of Hensen) takes place:

	On the anterior (cranial) end of the primitive streak
	On the posterior (caudal) end of the primitive streak
	In the middle of the primitive streak
	Outside of primitive streak

22 Primitive streak originates:

	In lateral parts of hypoblast
	In lateral parts of epiblast
	In the medial line of hypoblast
	In the medial line of epiblast

23 Two haploid gametes form together one cell which is called:

	Diploid gamete
	Embryoblast
	Zygote
	This question is wrong, gametes are diploid

24 Which are three parts of the intraembryonic mesoderm?

	Paraxial, transitional and superficially located
	Paraxial, intermediate and lateral plate
	Mesial, intermediate and profundus
	Paraxial, aboral and adoral

25 What is a capacitation?

	Capacitation is a process in which the glycoprotein layer over the acrosome is dissolved
	Capacitation is a process in which sperm penetrates zona pellucida
	Capacitation is a process in which the tail of the sperm is inactivated
	Capacitation is a process in which the tail of the sperm is activated

26 Where the fertilization occurs usually?

	In the infundibular part of the Fallopian tube
	In the ampullary part of the Fallopian tube
	Horn of the uterus (cornua uteri)
	Cavity of the uterus

27 Where originates the extraembryonic mesoderm?

	It is a result of the migration of cells from the neuroectoderm
	In a site between trophoblast and embryoblast
	In a site between hypoblast and epiblast
	In a site between endoderm and ectoderm

28 Where originates gonocytes?

	In the extraembryonic mesenchyme
	In the endoderm of the yolk sack
	In the ectoderm of yolk sack
	In the dorsal mesentery

29 Which statement about the neural plate is true?

	Neural plate forms itself between the node of Hensen and cloacal membrane
	Neural plate is the basic structure for neural tube and neural crests
	Neural plate originates at the ventral side of the germ disc
	Neural plate is of endodermal origin

30 Which statement is true about the trophoblast?

	It differentiates into outer cytotrophoblast and inner syncytiotrophoblast
	It differentiates into inner cytotrophoblast and outer syncytiotrophoblast
	Structure called "trophoblast" does not exist during the development of human
	It does not differentiate further

31 Which statement about the neural crest is not true?

	Some kind of mesenchyme can develop from the neural crest
	Neural crest give rise to the medula of the suprarenal gland
	Neural crest gives rise to the cortex of the suprarenal gland
	Melanocytes originate from the neural crest

32 Which statement about the primitive streak is true?

	It takes place between primitive node (node of Hensen) and cloakal membrane
	It sits perpendicular to the long axis of the germ disc
	It is the main structure-forming channel of Lieberkühn
	It is the main material for the formation of neural tube

33 Which statement about the zona pellucida is true?

	Zona pellucida is a membrane surrounding the oocyte, it is composed mainly of glycoproteins
	Zona pellucida is a membrane surrounding the oocyte, it is composed mainly of glycolipids
	Zona pellucida is on the border between theca folliculi interna and externa
	Zona pellucida is another name for Slavjanski's membrane

34 Which structure does not take place in the late blastocyst?

	Zona pellucida
	Trophoblast
	Embryoblast
	Cavity

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