Mitosis

Question 1

How does one parent cell gives rise to two genetically identical daughter cells.

Answer 1

Interphase
Mitosis
Cytokinesis

Question 2

Define genome

Answer 2

A cell’s DNA, its genetic information

Question 3

A typical human cell DNA length

Answer 3

2m

Question 4

Sister chromatids are attached by

Answer 4

Cohesins

Question 5

Shortest phase of cell cycle

Answer 5

Mitotic ( M) phase which includes both mitosis and cytokinesis

Question 6

Mitosis

Cytokinesis

Answer 6

Distribution of chromosomes into two daughter nuclei

division of cytoplasm,producing two daughter cells.Each daughter cell can start a new cycle.

Question 7

G1

S

G2

Functions

Answer 7

Metabolic activity and growth [unduplicated chromosomes]

Metabolic activity, growth and DNA synthesis[duplicated chromosomes]

Metabolic activity,growth and preparation for cell division

Question 8

During three phases of interphase

Answer 8

cell grows by producing proteins and cytoplasmic organelles.

Question 9

A particular human cell might undergo one cell division in

Answer 9

24 hours

[M phase occupies less than 1 hour but S phase occupy more than 10-12 hours or about the half the cycle]

Question 10

G2 phase takes usulally

Answer 10

4-6 hours

Question 11

G1 occupies

Answer 11

5-6 hours

Question 12

G1 is the most variable in length in different types of the cell True/ False

Answer 12

True

Question 13

Centrosomes

Answer 13

pair of centrioles

Question 14

How many chromosomes are in G2 of interphase

Answer 14

ZERO because chromosomes are not yet condensed as individuals.

Question 15

Prophase

Answer 15

The cromatin fibers becomes more tightly coiled,condensing into discrete chromosomes can be seen in LM.

The nucleoli disappear

Each duplicated chromosome appears as two identical sister chromatids joined at the centromeres.

The mitotic spindle begins to from .[The radial arrays of shorter micro-tubules that extend from the centrosomes are called asters ]

The cetrosomes move away from each other.Lengthening micro tubules.

Question 16

Prometaphase

Answer 16

The nuclear envelope fragments

The microtubules invades the nuclear area

The chromosomes become even more condensed

A kinetochore,a specialized protein structure has now formed at the centromere of each cromatids. Thus two per chromosome

There are kinetochore microtubules and non-kinetochore microtubules

Question 17

Metaphase

Answer 17

centrosomes are opp at poles of the cell

Metaphase plat [equidistant plate]

Question 18

Anaphase

Answer 18

shortest phase of mitosis

cohesin proteins are cleaved. hence each cromatid becomes independent chromosome.

The two new daughter chromosomes begin moving towards oo side of the cell as their kinetochore mictrotubile shortens.

Question 21

Refer pg no 293