Cell Cycle and Cell Division - Online Test
Q1. S phase marks
Answer : Option D
Explaination / Solution:
S phase marks the phase of DNA replication and chromosome duplication. In this phase increase in the amount of DNA takes place. No synthesis of proteins or RNA takes place.
Q2. Which one proceeds reformation of nuclear envelope during M-phase of cell cycle?
Answer : Option D
Explaination / Solution:
Before the completion of Mitosis reapperance of nuclear membrane takes place along with formation of nucleolus so that the cells bocemo separate enetities after cytokinesis but having same chromosome number as parent cells.
Q3. The stage of inactivation of cell cycle due to non-availability of mitogens and energy rich compounds is called
Answer : Option B
Explaination / Solution:
It is the stage of cell cycle during which the cells remain metabolically active and do not divide due to absence of mitogens and energy producing compounds.
Q4. Karyokinesis is the
Answer : Option E
Explaination / Solution:
Cell division consists of karyokinesis and cytokinesis. During karyokinesis division of chromosomes takes place and during cytokinesis division of cytoplasm takes place. Ultimately the cell divides into two halves.
Q5. Each chromosome consists of ---- chromatid.
Answer : Option A
Explaination / Solution:
The resulting two identical copies of DNA are connected to each other at the centromere. Each copy is called a chromatid. A chromosome, before cell division is formed of one chromatid while it is formed of two chromatids after cell division.
Q6. Plant Cytokinesis differ from animals Cytokinesis in having
Answer : Option B
Explaination / Solution:
In plants, cytokinesis or division of cytoplasm occurs due to cell plate formed out of deposition of materials along the equatorial region of cell but in animals cytokinesis occurs due to formation of cleavage furrow in the middle cell membrane.
Q7. Various phases of cell cycle are controlled by proteins
Answer : Option C
Explaination / Solution:
Cycline and CDKs can modify various protein substrates involved in cell cycle progression. Cancer results due to mutations of these proteins leading to uncontrolled cell divisions.
Q8. Which phase of M-stage is called as invisible phase?
Answer : Option D
Explaination / Solution:
S-phase of M-stage is called as invisible phase of cell cycle because during this phase synthesis of DNA takes place which is not visible to the naked eye. There is only imbalance of Nucleoplasmic ratio.
Q9. Multinucleate condition arise when Cytokinesis does not follow karyokinesis, this type of cells are called as
Answer : Option D
Explaination / Solution:
Karyokinesis is followed by cytokinesis but some times cytokinesis is not followed by karyokinesis which leads to the establishment of multinucleate condition. This type of cells are called as coenocytes.
Q10. The mechanism of distributing centriole pairs to the daughter cells is called
Answer : Option A
Explaination / Solution:
The mechanism of distributing chromosomes to the daughter cells is called astral division. This kind of division occurs in animal cells.
