Which one of the following statements concerning the nuclear envelope is INCORRECT?

It is the site of synthesis of proteins that form elements of the nuclear matrix

It is continuous with the membranes of the rough endoplasmic reticulum

It serves as the boundary between the cytoplasmic and nuclear compartments

It is stabilized on its inner aspect by filaments of the nuclear lamina

It contains pores that regulate passage of materials in both directions between nucleus and cytoplasm

10

61

Из 106

Microvilli are structures that

are made of actin microfilaments

are composed of intermediate filaments

allow flagella of spermatozoa to move

have basal

bodies at their bases

10

62

Из 106

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.

10

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

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