Chapter: Cell Cycle and Cell Division

The centriole undergoes duplication during

Match the List-I with List-II.
List-I                                                       List-II
A. S-phase                             1. Proteins are synthesised
B. G₂ -phase                         2. Inactive phase
C. Quiescent stage               3. Interval between mitosis and initiation of DNA replication
D. G₁ -phase                         4. DNA replication
Choose the correct answer from the options given below.

Attachment of spindle fibres to kinetochores of chromosomes becomes evident in

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

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

Cells in G₀ phase

The correct sequence of phases of cell cycle is

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

During cell growth, DNA synthesis takes place in

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?

In S-phase of the cell cycle

Given below is a schematic break-up of the phases/stages of cell cycle

Which one of the following is the correct indication of the stage/phase in the cell cycle?

At what stage of the cell cycle are histone proteins synthesised in a eukaryotic cell?

In the somatic cell cycle

Which of the following occurs more than one and less than five in a chromosome?

During cell division in apical meristem the nuclear membrane appears in

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 ?

In a mitotic cycle, the correct sequence of phases is

Match the following (Columns) events that occur in their respective phases of cell cycle and select the correct option from the codes given below.
Column I                                                        Column II
A. G₁ -phase                                 1. Cell grows and organelle duplication
B. S phase                                     2. DNA replication and chromosome duplication
C. G₂ -phase                                 3. Cytoplasmic growth
D. Metaphase in M-phase         4. Alignment of chromosomes

After karyogamy followed by meiosis, spores are produced exogenously in

Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animals cells. If APC is defective in a human cells, which of the following is expected to occur?

Which of the following options gives the correct sequences of events during mitosis ?

Which of the following is not a characteristic feature during mitosis in somatic cells?

Spindle fibres attach on to

The complex formed by a pair of synapsed homologous chromosomes is called

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristic mentioned.

Select the correct option with respect to mitosis.

During mitosis ER and nucleolus begin to disappear at

Which stages of cell division do the following figures A and B represent respectively?

Centromere is required for

If you are provided with root tips of onion in your class and are asked to count the chromosomes which of the following stages can you most conveniently look into?

Which one of the following precedes reformation of the nuclear envelope during M-phaseof the cell cycle?

Mitotic spindle is mainly composed of which protein?

Best material for the study of mitosis in laboratory is

During cell division, the spindle fibres attach to the chromosome at a region called

How many mitotic divisions are needed for a single cell to make 128 cells?

Which one of the following structures will not be common to mitotic cells of higher plants?

The point, at which polytene chromosomes appear to be attached together, is called

Best stage to observe shape, size and number of chromosomes is

In salivary gland chromosomes/polytene chromosomes pairing is

Number of chromatids at metaphase is

Mitotic anaphase differs from metaphase in possessing

A bivalent consists of

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

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

During meiosis 1, in which stage synapsis takes place?

Dissolution of the synaptonemal complex occurs during

Match the following columns with respect to meiosis.
Column I                          Column II
A. Zygotene               1. Terminalisation
B. Pachytene             2. Chiasmata
C. Diplotene              3. Crossing over
D. Diakinesis            4. Synapsis
Select the correct option.

After meiosis-I, the resultant daughter cells have

In meiosis crossing over is initiated at

Match the stages of meiosis in column I to their characteristic features in column II and select the correct option using the codes given below
Column I                              Column II
A. Pachytene              1. Pairing of homologous chromosomes
B. Metaphase-I         2. Terminalisation of chiasmata
C. Diakinesis             3. Crossing-over takes place
D. Zygotene               4. Chromosomes align at equatorial plate

Arrange the following events of meiosis in correct sequences.
I. Crossing over
II. Synapsis
III. Terminalisation of chiasmata
IV. Disapperance of nucleolus

The enzyme recombinase is required at which stage of meiosis?

Meiosis takes place in

During gamete formation, the enzyme recombinase participates during

Given below is the representation of a certain event at a particular stage of a type of cell division.

Which is this stage?

Synapsis occurs between

Crossing over that results in genetic recombination in higher organisms occur between

The exchange of genetic material between chromatids of paired homologous chromosomes during first meiotic division is called

Lampbrush chromosomes occur during

Meiosis has evolutionary significance because it results in

Meiosis-II performs

In meiosis, the daughter cells differ from parent cell as well as amongst themselves due to

Meiosis-I is reductional division. Meiosis-II is equational division due to