chromatin may be transformed one into another; E
– the abundance of euchromatin gives
evidence of intense protein synthesis.
14. Each of the following statements concerning the nucleolus functions is true,
EXCEPT:
A
– the nucleolar organizer region contains genes encoding mRNA; B – rRNA is
synthesized and assembled into ribosome subunits; C
– ribosome subunits leave the
nucleus through nuclear pores; D
– in the cytoplasm, ribosomes either assemble into
polysomes or bind to rER; E
– the number and size of nucleoli give evidence of intense
protein synthesis.
15. Each of the following statements concerning mitosis is true, EXCEPT:
A
– results in the production of two identical daughter cells; B – is direct cell division; C –
equally divides chromosomes between daughter cells; D
– maintains the diploid number of
chromosomes; E
– consists of four phases.
16. Each of the following statements concerning the mitotic spindle is true,
EXCEPT:
A
– contains microtubules; B – its components are attached to a chromosome at the
kinetochore; C
– is responsible for chromosome movement in the anaphase; D – is formed
before chromosome condensation; E
– centrioles take part in its formation.
17. The following cytoplasmic components are inclusions, EXCEPT:
A
– lipid droplets; B – glycogen clumps; C – lysosomes; D – mucous granules; E – protein
granules.
Directions
: one or more of the given statements or completions is/are correct. Choose the
answer: A
– if only 1,2, and 3 are correct; B – if only 1 and 3 are correct; C – if only 2 and
4 are correct; D
– if only 4 is correct; E – if all are correct.
18. The glycocalyx is composed of:
(1) glycoproteins (2) cholesterol (3) glycolipids (4) glycogen
19. The rER synthesizes:
(1) secretory proteins (2) cell membrane proteins (3) lysosome enzymes (4) cytosol
proteins
20. The abundance of rER in the cytoplasm can be identified by:
(1) diffuse basophilia (2) acidophilia (3) absence of staining (4) local basophilia
21. The functions of sER are as follows:
(1) lipid metabolism (2) carbohydrate metabolism (3) detoxification (4) release and
recapture of calcium ions in muscles
22. The following statements regarding the Golgi apparatus are true:
(1) consists of several disk-shaped saccules arranged in a stack (2) its
cis
(convex) face is
associated with small vesicles from ER (3) its
trans
(concave) face is associated with
vacuoles (4) it is abundant in secretory cells
23. The following statements regarding the Golgi apparatus functions are true:
(1) accumulates, modifies, and packs secretory products (2) forms primary lysosomes (3)
takes part in the synthesis of lipoproteins, glycoproteins, and glycolipids (4) manufactures
membrane proteins
24. The lysosome membranes and lysosome enzymes are formed in:
(1) rER (2) sER (3) Golgi apparatus (4) free ribosomes
25. The following statements regarding the lysosome functions are true:
(1) protect cells from waste products accumulation (2) degrade aged organelles (3) take
part in phagocytosis (4) provide autolysis
26. The following statements regarding the peroxisome are true:
(1) is a spherical structure surrounded by unit membrane (2) its matrix contains the
enzyme
catalase
(3) its catalase converts hydrogen peroxide to water and oxygen (4) is
derived from rER