27. The following statements regarding the centrioles are true:
(1) exist as a pair of cylinder-like structures oriented at right angle to one another (2) each
centriole has nine peripheral microtubule triplets but lacks the central pair (3) before cell
division they replicate themselves by forming procentrioles (4) during cell division,
separate and migrate to the cell poles
28. The cytoskeleton includes:
(1) actin filaments (2) intermediate filaments (3) microtubules (4) centrioles
29. The following statements regarding the microtubule functions are true:
(1) are parts of the cytoskeleton (2) form the mitotic spindle (3) take part in intracellular
transport and cell movement (4) constitute cilia, flagella, and centrioles
30. The cells containing a lot of free ribosomes synthesize:
(1) secretory proteins (2) cytosol proteins (3) cell membrane proteins (4) proteins for cell
growth and differentiation
31. The following events take place in the G1 period of the mitotic interphase:
(1) intense protein synthesis (2) DNA reduplication (3) daughter cell growth (4) self-
replication of centrioles
32. The following events take place in the S period of the mitotic interphase:
(1) DNA reduplication (2) daughter cell growth (3) self-replication of centrioles (4) intense
energy production
33. The following events take place in the G2 period of the mitotic interphase:
(1) intense energy production (2) ATP accumulation (3) intense tubulin synthesis (4) DNA
reduplication
34. The following events take place in the mitotic prophase:
(1) chromosome condensation (2) nucleolus disappearance (3) nuclear envelope
disorganization (4) centriole migration to the opposite cell poles
35. The following events take place in the mitotic metaphase:
(1) chromosome condensation (2) chromosome assembling on the equatorial plate (3)
nucleolus disappearance (4) the mitotic spindle formation
36. The following events take place in the mitotic anaphase:
(1) chromosome condensation (2) nucleolus disappearance (3) the mitotic spindle
formation (4) movement of chromosomes to the opposite cell poles
37. The following events take place in the mitotic telophase:
(1) chromosome decondensation (2) nuclear envelope restoration (3) nucleolus re-
appearance (4) cytoplasm division
38.The absence of cytoplasmic division (cytokinesis) in mitosis results in:
(1) cell death (2) generation of a subsequent mitosis (3) formation of haploid cell (4)
formation of multinuclear cell
2. EPITHELIAL TISSUE
Directions
: each of the following statements contains five suggested completions. Choose
the one that is best in each case.
1. Each of the following statements concerning the mesothelium is true, EXCEPT:
A
– is derived from mesoderm; B – is simple; C – its cells are squamous; D – not each of
its cells reaches the lumen; E
– lines the peritoneal cavity.
2. Each of the following statements concerning the pseudostratified epithelium is
true, EXCEPT:
A
– all its cells rest on the basement membrane; B – all its cells reach the apical surface;
C
– contains goblet cells; D – is ciliated; E – contains short (basal) cells.