histology

The cells whose nuclei contain sex chromatin (Barr body) were found in the amniotic fluid during the investigation that obtained by amniocentesis (amniotic membrane puncture). What could it mean?

The culture of the tumor cells was affected by colchicine, which inhibits formation of the proteins-tubulins that are necessary for the spindle apparatus formation. What stage of the cell cycle will be affected?

A tumor of the pyloric part of the stomach was diagnosed in the patient. What proteins are able to inhibit the mitotic division of newly formed cells?

A few cells of the oral cavity epithelium were taken for the examination. Sex chromatin (Barr body) was found in the nuclei of epithelial cells after special processing of the histological specimen. Which chromosome forms a sex chromatin?

It is known that apoptosis is programmed cell death that occurs in human during the whole ontogenesis. Which of the following features are typical for apoptosis?

There are three periods of the cell cycle interphase. What process takes the place during the S-period?

The navy-blue chromatin granules were found at the nucleus on the slide that is stained by hematoxylin and eosin. What is the stage of the cell cycle?

At the electronic microphotography the nucleus is surrounded by the thin lamina of biological membrane. How does it called?

Moving of the daughter chromatids to the poles of the cell is observed in the mitotically dividing cell. On what stage of the mitotic cycle is this cell?

The cell without the nucleus and nucleolus is presented at the electron microphotography. The chromosomes are free; the centrioles migrate to the poles. In which phase of the cell cycle is the cell?

Compaction of the nucleus was observed on the electron microphotography of the cells taken from animals after a chemical exposure. What is the state of the nucleus in the cell?

A very low content of heterochromatin was found at the hepatocyte nuclei during microscopic study. What functional state of the cell does it mean?

The study of mitotic cycle phases of the onion root revealed the cell, in which the chromosomes are situated in the equatorial plane, forming a star. What stage of the cell mitosis is it?

While studying maximally spiraled chromosomes of human karyotype the process of cell division was stopped in the following phase:

Human somatic cells in the metaphase were found in the histological preparation. How many chromosomes the metaphase plate consists of in case if each chromosome has two sister chromatids?

A common physiological phenomenon which is programmed and genetically controlled process that is induced by killer genes is observed during embryogenesis. In this case there are condensation of the nucleus, condensation of chromatin and disintegration of the nucleus into the “micronuclei”, condensation of the cytoplasm and its fragmentation. The cell splits into bodies containing the “micronuclei” that are phagocytosed by macrophages. What phenomenon is this?

The histone proteins synthesis was artificially blocked in the cell. What cell structure will be damaged?

Cells in the tissue culture were affected by colchicine, a substance that inhibits the contraction of microtubules of the spindle apparatus, with the aim of obtaining a human karyotype. At which stage will mitosis be stopped?

It is known that the syntheses of the proteins-tubulins are blockaded under the colchicine action. What stage of the cell cycle will be disordered in this case?

The syntheses of proteins - tubulines, which take part in the mitosis formation, were destroyed during the postsynthetic period of mitotic cycle. It can cause the impairment of: