All of the following features are characteristic of apoptosis except one.
Swelling of the cell.
Formation of the "apoptosome", consisting of cytochromes
Increase in cytoplasm calcium concentration.
Activation of endonucleases.
Movement of mitochondria to the outside of the plasma membrane.
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63
Из 106
A metaphase-blocking dose of colchicines works by which of the following mechanisms
Inhibition of tubulin polymerization
Depolymerization of myosin
Enhancement of tubulin polymerization
Depolymerization of actin
Binding to and stabilizing microtubules
10
64
Из 106
Which organelle in the muscles is involved in the Ca+2 accumulation?
Smooth endoplasmic reticulum
Peroxisomes
Rough endoplasmic reticulum
Ribosomes
Lysosomes
10
65
Из 106
The child inherits an antigen of histocompatibility from the father and mother. It is known, that the expression of parent antigens in an embryogenesis begins very early. But the immune system of mother does not tear away a fetus. What fetal membrane for the first time hinders fetus from mother’s organism?
Chorion
.Cytotrophoblast
Аllantois
Yolk sack
Placenta
10
66
Из 106
Producing series of hormones, the placenta plays a role of a temporal endocrine gland. What hormone can be specific in a blood of the woman for 3-4 day after the beginning of an implantation, which is used, in medical practice for early diagnosing pregnancy?
Chorionic gonadotropin
Somatostatin
Progesterone
Oxytocin
Vasopressin
10
67
Из 106
The germ of an organ, which has endocrine function, is formed from a trophoblast during embryogenesis. Name this organ.
Villous chorion
Yolk sack
Amnion
Аllantois
Umbilical cord
10
68
Из 106
It is known, that some microorganisms which cause infectious diseases, can transit through a placental barrier. What the structure designated below, enter its composition from?
All structural ingredients of the tertiary villi
All structural ingredients of the secondary villi
All structural ingredients of the primary villi
Yolk sack and allantois
Chorion and an amnion
10
69
Из 106
Fetal sex can be diagnosed by noting the presence or absence of the Barr body in cells obtained from the amniotic fluid. What is the etiology of the Barr body?
Inactivation of one X chromosome
Inactivation of both X chromosomes
Inactivation of homologous chromosomes
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Inactivation of one Y chromosome
Inactivation of one chromatid
10
70
Из 106
When does a secondary oocyte complete its second meiotic division to become a mature ovum?
at ovulation
before ovulation
at fertilization
puberty
before birth
10
71
Из 106
How soon after fertilization occurs within the uterine tube does the blastocyst begin cleavage?
by day
by 12 hours
by day 1
by day 2
7within minutes
10
72
Из 106
Where does the blastocyst normally implant?
functional layer of the endometrium
functional layer of the cervix
basal layer of the endometrium
myometrium
perimetrium
10
73
Из 106
All of the following structures are necessary for blastocyts implantation EXCEPT?
zona pellucida
endometrium in progestational phase
syncytiotrophoblast
cytotrophoblast
functional layer of the endometrium
10
74
Из 106
Which of the following components plays the most active role in invading the endometrium during blastocyst implantation?
syncytiotrophoblast
epiblast
hypoblast
extraembryonic somatic mesoderm
extraembryonic visceral mesoderm
10
75
Из 106
Between which two layers is the extraembryonic mesoderm located?
exocoelomic membrane and cytotrophoblast
syncytiotrophoblast and cytotrophoblast
syncytiotrophoblast and endometrium
exocoelomic membrane and syncytiotrophoblast
epiblast and hypoblast
10
76
Из 106
During the second week of development, the embryoblast receives its nutrients via
diffusion
osmosis
reverse osmosis
fetal capillaries
yolk sac nourishment
10
77
Из 106
Which germ layers are present at the end of week 3 of development (day 21)?
ectoderm, mesoderm, and endoderm
epiblast and hypoblast
ectoderm and endoderm
epiblast only
epiblast, mesoderm, and hypoblast
10
78
Из 106
Which process establishes the three definitive germ layers?
gastrulation
neurulation
craniocaudal folding
lateral folding
angiogenesis
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10
79
Из 106
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