Cell Cycle and Cell Division

In which animal do haploid cells divide mitotically to produce gametes ?

1. Male honeybees
2. Male grasshoppers
3. Male earthworms
4. Male frogs

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Statement I is incorrect, but Statement II is true
2. Both Statement I and Statement II are true
3. Both Statement I and Statement II are false
4. Statement I is correct, but Statement II is false

The correct sequence of adult cell cycle phases is .

1. S-M-G2-G1
2. G1-G2-S-M
3. G1-M-G2-S
4. G1-S-G2-M

What is the main function of the spindle fibers during mitosis?

1. To repair damaged DNA
2. To regulate cell growth
3. To separate the chromosomes
4. To synthesize new DNA

Spindle fibers attach to kinetochores of chromosomes during

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

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

Following are the stages of cell division : Choose the correct sequence of stages from the options given below :

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

Recombination between homologous chromosomes is completed by the end of

1. Diakinesis
2. Zygotene
3. Diplotene
4. Pachytene

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

1. Pachytene
2. Diplotene
3. Diakinesis
4. Zygotene

Which of the following stages of meiosis involves division of centromere?

1. Metaphase II
2. Anaphase II
3. Telophase
4. Metaphase I

Among eukaryotes, replication of DNA takes place in :

1. S phase
2. G1 phase
3. G2 phase
4. M phase

Select the correct statements. Choose the correct answer from the options given below:

1. B and D only
2. A, C and E only
3. B and E only
4. A and C only

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are incorrect.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect but Statement II is correct.
4. Both Statement I and Statement II are correct.

Which one of the following never occurs during mitotic cell division?

1. Spindle fibres attach to kinetochores of chromosomes
2. Movement of centrioles towards opposite poles
3. Pairing of homologous chromosomes
4. Coiling and condensation of the chromatids

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:

1. Synaptonemal complex
2. Bivalent
3. Sites at which crossing over occurs
4. Terminalization

Regarding Meiosis, which of the statements is incorrect?

1. There are two stages in Meiosis, Meiosis-I and II
2. DNA replication occurs in S phase of Meiosis-II
3. Pairing of homologous chromosomes and recombination occurs in Meiosis-I
4. Four haploid cells are formed at the end of Meiosis-II

Select the incorrect statement with reference to mitosis :

1. All the chromosomes lie at the equator at metaphase
2. Spindle fibres attach to centromere of chromosomes
3. Chromosomes decondense at telophase
4. Splitting of centromere occurs at anaphase

Which stage of meiosis can last for months or years in the oocytes of some vertebrates?

1. Diakinesis
2. Leptotene
3. Pachytene
4. Diplotene

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme

1. Polymerase
2. Phosphorylase
3. Recombinase
4. Transferase

Identify the correct sequence of events during Prophase I of meiosis: Choose the correct answer from the options given below:

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

Bivalent or Tetrad formation is a characteristic feature observed during

1. Chiasmata in zygotene stage
2. Synaptonemal complex in zygotene stage
3. Chiasmata in Diplotene stage
4. Synaptonemal complex in Pachytene stage

With respect to metaphase, which of the following statements is incorrect?

1. Chromosomes lie at the equator of the cell
2. Complete disintegration of nuclear envelope takes place
3. Chromosomes are highly condensed
4. Metaphase chromosomes are made up of four sister chromatids held together by centromere

Which of the following stages of meiosis involves division of centromere?

1. Telophase II
2. Metaphase I
3. Metaphase II
4. Anaphase II

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after S phase?

1. 32
2. 8
3. 16
4. 4

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

1. Pachytene
2. Leptotene
3. Zygotene
4. Diakinesis

The centriole undergoes duplication during :

1. G2 phase
2. S-phase
3. Prophase
4. Metaphase

Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of

1. G1 phase
2. S phase
3. G2 phase
4. M phase

Dissolution of the synaptonemal complex occurs during

1. Diplotene
2. Zygotene
3. Pachytene
4. Leptotene

Identify the correct statement with regard to G1 phase (Gap 1) of interphase

1. Cell is metabolically active, grows but does not replicate its DNA.
2. DNA synthesis or replication takes place.
3. Nuclear Division takes place.
4. Reorganisation of all cell components takes place.

Cells in G0 phase:

1. suspend the cell cycle
2. terminate the cell cycle
3. exit the cell cycle
4. enter the cell cycle