The serous cells form the secretory potions of a parotid gland. Which of the following organelles provide synthesis and secretion of salivary enzymes?
Rough endoplasmic reticulum, Golgi apparatus
Smooth endoplasmic reticulum
Lysosomes
Endosomes
Mitochondria, Golgi apparatus
10
29
Из 106
A solution of amino acid leucine with a radioactive label has been added to a culture medium where animal cells are growing. A high concentration of marked amino acid near some organelles has been found by a method of radioautography. These organelles can be:
Ribosomes
Lysosomes
Smooth endoplasmic reticulum
Cell center
Golgi apparatus
10
30
Из 106
At reversion to the doctor the patient complained of the strongest girdle pains at a level of an epigastrium, temperature, nausea and vomiting. He is hospitalized with the diagnosis - a pancreatitis. What cell structures at destruction of the membrane are capable to cause an autolysis and fusion of cells and tissues?
Lysosomes
Ribosomes
Smooth endoplasmic reticulum
Cell center
Golgi apparatus
10
31
Из 106
A cell laboratory animal have subjected to an exuberant X-ray irradiating. In outcome roteinaceous fragments in cytoplasm were formed. What organelles of a cell will take part in their salvaging?
Lysosomes
Ribosomes
Endoplasmic reticulum
Cell center
Ribosomes
10
32
Из 106
To hospital converted the man with genetical set of Kartenger’s symptoms, in which locomotion of cilia and flagella absent. What are molecular mechanisms of this pathology?
Lack of dynein
An excess of dynein
Lack of tubulin
A deficit of spectrins
A deficit of hyaluronidase
10
33
Из 106
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?
Anaphase
Interphase
Metaphase
Prophase
Telophase
10
34
Из 106
The cell of the laboratory animal was overdosed with Roentgen rays. As a result, albuminous fragments formed in the cytoplasm. What cell organelles will take part at their utilization?
Lysosomes
Cells center
Ribosome
Endoplasmic reticulum
Golgi complex
10
35
Из 106
As a result of blocking separate ingredients of a genome, a cell gain characteristic for them morphological, biochemical and function singularities. What title has this process?
Differentiation
Capacitation
Reception
Adhesion
Determination
10
36
Из 106
During the postsynthetic period of mitotic cycle the synthesis of proteins – tubulines, which take part in the mitosis formation, was destroyed. It can cause the impairment of:
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Duration of mitosis
Chromosome spiralization
Chromosome despiralization
Chromosome condensation
Cytokinesis
10
37
Из 106
The study of mitotic cycle phases of onion root revealed the cell, in which the chromosomes are situated in the equatorial plate, forming a star. What stage of the cell mitosis is it?
Metaphase
Interphase
Prophase
Anaphase
Telophase
10
38
Из 106
Which of the following components of the mitochondria would be most abundant in those cells that have high ATP production?
Cristae
Inner membrane space
Matrix
Outer mitochondrial membrane
Dense granules
10
39
Из 106
Which of the following events occurs during anaphase of mitosis?
Chromatids separate
Chromosomes coil
Nuclear envelope reforms
Chromosomes uncoil
Nuclear envelope begins to break down
10
40
Из 106
After examining a tissue from a biopsy specimen, a pathologist notes that a large percentage of the cells have nuclei with abundant nucleoli. Which of the following cellular events would be elevated in these cells?
rRNA production
Mitosis
mRNA production
Production of secreted proteins
Exocytosis
10
41
Из 106
Cells that are actively involved in the phagocytosis of extracellular material would contain high levels of which of the following cellular organelles?
Lysosomes
Rough endoplasmic reticulum
Golgi apparatus
Smooth endoplasmic reticulum
Ribosomes
10
42
Из 106
A small tumor was excised from the adrenal gland of an adult male. After examination, the cells of the tumor were shown to express excessively high levels of lipid and steroid hormones. Which of the following organelles were abundant within these tumor cells?
Smooth endoplasmic reticulum
Rough endoplasmic reticulum
Ribosomes
Lysosomes
Peroxisomes
10
43
Из 106
A tumor was removed from the liver of a patient, and cell cultures of tumor cells were established. Before chromosomal analysis of these cells, colchicines was added to a culture. This alkaloid prevents the polymerization of microtubules. These cancerous cells would be arrested at which of the following stages of mitosis?
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Metaphase
Anaphase
Interphase
Telophase
Prophase
10
44
Из 106
A pathologist is studying a tissue section of the cerebrum by light microscopy. He notes a structure within a neuron that has both a granular and a fibrous component. Which of the following is this pathologist examining?
Nucleolus
Ribosome
Golgi apparatus
Rough endoplasmic reticulum
Mitochondria
10
45
Из 106
A pathologist is studying a tissue section of the cerebrum by light microscopy. He notes a structure within a neuron that has both a granular and a fibrous component. What is the main function of the cellular component?
rRNA production
ATP production
Protein trafficking
Protein packaging
Site of protein synthesis
10
46
Из 106
A fresh biopsy specimen appears to be undergoing atrophy. The nuclei of cells of this tissue are isolated by fractionation and homogenized. The resultant nuclear material is separated in an agarose gel and stained with ethidium bromide, which binds tymidin residues of DNA. Examining the gel under ultraviolet light, the researcher notes that the DNA is separated in increments of 200 base pairs by comparing it with the DNA standards. Which of the following accounts for this observation?
Nucleosomes
Chromosomes
Heterochromatin
Nucleoli
Euchromatin
10
47
Из 106
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