Mitotic Phase

Q.

Why does a cell spend the most time in interphase?

Q.

What is aster

Q.

What are the characteristics of Mycoplasma?

Q.

Where does mitosis occur in the body?

Q.

What is the correct order of cell cycle?

Q. Which of the following is not a phase of mitosis?

1. Metaphase
2. Anaphase
3. Telophase
4. Interphase

Q. Nucleo-cytoplasmic ratio in eukaryotes is restored by

1. mitosis
2. both mitosis and meiosis
3. meiosis
4. neither mitosis nor meiosis

Q. A parent cell with 24 chromosomes undergoes mitosis and produces ______ daughter cells, each with ______ chromosomes.

1. 4, 12
2. 4, 24
3. 2, 12
4. 2, 24

Q.

Give one difference between each of the following pairs on the basis of what is given in the bracket:

Metaphase and Anaphase (position of chromatids).

Q. Assertion: M-phase is the most dramatic period of the cell cycle.
Reason: It involves a major reorganisation of virtually all components of the cell.

Select the correct options:

1. Both assertion & reason are true & the reason is a correct explanation of the assertion.
2. Both assertion & reason are true but reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion & reason are false.

Q. What is dikaryophase?

Q. A plant cell has 12 chromosomes at the end of mitosis, How many chromosomes would it have in the G2 phase of its next cell cycle?

1. 24
2. 6
3. 8
4. 12

Q.

Question 8
Which of the events listed below is not observed during mitosis?
(a) Chromatin condensation
(b) Movement of centrioles to opposite poles
(c) Appearance of chromosomes with two chromosome joined together at the centromere
(d) Crossing over

Q.

This graph is a typical cell cycle representing DNA content of various phases (1 to 4). Identify the phases based on changes in the DNA content and select the correct option.

1. M, G₁, S, G₂.

2. G₂, M, G₁, S.

3. S, G₂, M, G₁.

4. G₁, S, G₂, M.

Q. For selection of recombinants, insertional inactivation of antibiotic marker has been superseded by insertional inactivation of a marker gene coding for a chromogenic substrate. Give reasons.

Q. Some examples of lower plants and social insects where haploid cells also divide by mitosis

Q.

Question 31
Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
Nuclear membrane fails to disintegrate

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
Duplication of DNA does not occur

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
Centromeres do not divide

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
Cytokinesis does not occur.

Q. The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of

1. Inactivation of glycosidase enzyme in recombinant bacteria
2. Non-recombinant bacteria containing beta galactosidase
3. Insertional inactivation of alpha galactosidase in non-recombinant bacteria
4. Insertional inactivation of alpha galactosidase in recombinant bacteria

Q.

Question 5
Mitosis is characterised by
(a) reduction division
(b) equal division
(c) Both (a) and (b)
(d) pairing of homologous chromosomes

Q.

What are plasmodesmata and desmosomes?

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Question 32

Both unicellular and multicellular organisms undergo mitosis. What are the differences, if any, observed in the process between the two?

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Question 26

Mitochondria and plastids have their own DNA (genetic material). What is known about their fate during nuclear division like mitosis?

Q. What would be the number of DNA molecules and the DNA content before the Metaphase-II stage in the meiocyte of the human cell?

1. 23, 2C
2. 23, 1C
3. 46, 2C

4. 46, 1C

Q.

Question 16

Which part of the human body should one use to demonstrate stages in mitosis?

Q. The image given below is a diagrammatic representation of cell cycle. Which alphabet represents the cell division?

1. B
2. D
3. C
4. A

Q. A cell can function properly and divide mitotically even in the absence of

1. plasma membrane
2. cytoskeleton
3. mitochondria
4. plastids

Q. Mitosis does not include the division of

1. none of these
2. cytoplasm
3. nucleus
4. centrioles

Q.

Can you brief the sequence of events occurring during mitosis?

Q. What is crossing over? Write the significance of crossing over.

Q. Separation of daughter chromosomes occurs during

1. cytokinesis
2. karyokinesis
3. S phase
4. $G_2$ phase