Histology MCQs/General Embryology



{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
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{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
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{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
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{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
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{Which structures form the bilaminar germ disk? - Mesoderm and mesenchyme + Epiblast and hypoblast - Endoderm and ektoderm - Laurel and Hardy
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{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
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{Which statement about cells of the embryoblast is true? (possible formulation is also: "Cells of the embryoblast are:) - They are multipotent, i.e. they can differentiate into the majority of existing cell types + They are totipotent, i.e. they can differentiate into every embryonic cell - They are temporary, i.e. they completely disappear soon - They are able to form structures of the placenta only
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{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
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{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
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{When start differentiation of somites (somitogenesis)? + In 3rd week - In 4th week - In 5th week - In 6th week
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{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
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{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
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{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
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{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
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{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
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{When starts the implantation? - Immediately after fertilization - 3rd day after fertilization + 6th day after fertilization - 9th day after fertilization
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{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
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{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
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{Paraxial mesoderm give rise: - Both somatopleura and splanchnopleura - Intermediate mesoderm - Chordal plate + Somits
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{What is a prechordal plate? + Ventral thickening of endoderm - Ventral thickening of ectoderm - Dorsal thickening of endoderm - Dorsal thickening of ectoderm
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{Which structure delineates the primary yolk sack? + Heuser's membrane - Splanchnopleura - Trophoblast - Mesoderm
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{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
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{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
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{Two haploid gametes form together one cell which is called: - Diploid gamete - Embryoblast + Zygote - This question is wrong, gametes are diploid
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{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
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{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
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{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
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{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
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{Where originates gonocytes? - In the extraembryonic mesenchyme + In the endoderm of the yolk sack - In the ectoderm of yolk sack - In the dorsal mesentery
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{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
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{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
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{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
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{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
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{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
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{Which structure does not take place in the late blastocyst? + Zona pellucida - Trophoblast - Embryoblast - Cavity
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