Cell Division

“The cell's DNA replicates”. This event occurs in cell cycle during

• M phase

• G1 phase

• S phase

• G2 phase

Which of the following statement is FALSE about the cell cycle?

• Development of spindle fibers occur in G₂

• The cell spends the most amount of time in G₂ phase

• G₁ is the longest time taken in the cell cycle of most cells

• G₁ is the time when the cell increases in size

Interphase is the part of the cell cycle when ___________.

• a cell ceases to function

• a germ cell forms its spindle apparatus

• a cell grows and replicates its DNA

• mitosis proceeds

Which of the following is not a stage of mitosis?

• Prophase

• interphase

• metaphase

• anaphase

Synthesis of proteins take place in ______________.

• G₁ phase

• S phase

• karyokinesis

• cytokinesis

Which of the following is 'the behaviour of the chromosome' during mitosis?

• Early mitotic spindle formed from the centrosomes

• Nuclear envelope disappears

• Sister chromatids separate from each other to the poles of the cells

• Two cells formed by formation of cleavage furrow

All of the following occur during prophase of mitosis in animal cells EXCEPT

• The centrioles move toward opposite poles

• Chromosomes are duplicated

• The nucleolus can no longer be seen

• The spindle is organized

The significance of mitosis in human are:

I. Asexual reproduction

II Repair of damaged tissue

III. Growth

IV. Gamete production

• I only

• II and IV

• I and IV

• II and III

Which of the following statements is NOT TRUE?

• Mitosis produces new nuclei with exactly the same chromosomal number as the parent nucleus

• Mitosis produces genetically non identical daughter cells as the parent cell

• Mitosis and cytokinesis are required for asexual reproduction

• The mitotic spindles in eukaryotic cells are composed of microtubules

Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with

• A single large nucleus

• Two nuclei but with half the amount of DNA

• Two nuclei

• High concentrations of actin and myosin