Cell Cycle

Class 11th Biology – 10 Cell Cycle and Cell Division MCQs

In cell cycle, DNA replication takes place in

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G1 phase, also called Gap I phase is characterized by increase in cell size. In the S phase or synthetic phase, DNA molecules replicate. G2 is the second growth phase, also called Gap II where there is intensive formation of RNAs and proteins. In the mitotic metaphase, the chromosome are arranged at the equatorial plate.

Recombinant nodules are found during which of the following

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Knot like structure 'Chromosomes' found in the stage leptotene of prophase first of meiosis.

The cell plate formed during cytokinesis in plants forms

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The cell plate goes on to form the middle lamellae of the new plant cell. The cell wall and the secondary cell wall form over this lamella .The cell membrane is internal to the middle lamella.

Replication of centriole occurs during

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It occurs during S phase of Interphase.

Types of division which occur in Meiosis I and Meiosis II respectively are

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Meiosis I is reductional division as it reduces chromosomes to half (involves separation of homologous chromosomes) whereas Meisois II is equational division(involves separation of chromatids just like mitosis).Hence the correct option is B

Which of the following statement is incorrect about meiosis?

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Meiosis is reductional division. The other options are all true for meiosis.

The endosperm of coconut is an example of

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The endosperm of the coconut is formed as cytokinesis does not follow karyokinesis.It is an example of a multinucleate cell.

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

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Meiosis II is an equational division which is meant for maintaining the haploid number, separating the two chromatids of a chromosome.

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

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During metaphase, the centromeres of the chromosome lie on the equatorial plate according to their size and spatial arrangement. So it is the best time to count the number and study the morphology of chromosomes.

Which part of the cell disappears during mitosis?

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The nucleolus along with the nuclear membrane disappears.

Which of the following occurs only in meiosis?

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Pairing of homologous chromosomes occurs only in meiosis. The other processes are common to both mitosis and meiosis.

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

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Kinetochore is the proteinaceous covering of centriole, to which spindle fibres attatch.

In which stage of the cell cycle will RNA polymerase enzyme be most active ?

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RNA polymerase is needed for protein synthesis which occurs during G2 phase

Recombination of genes occur at

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The crossing over of homologous chromosome occurs in pachytene of prophase first of meiosis. It is known as recombination.

Cytokinesis refers to

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The process of division of cytoplasm is called Cytokinesis.

Synaptonemal complex is formed during

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Synaptonemal complex is formed during meiotic prophase first.

At which stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

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Histone proteins are synthesized during S-phase of cell cycle.

The phase between Meiosis I and Meiosis II is called

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The phase between Meiosis I and Meiosis II is called Interkinesis.There are no phases like Interphase I and Interphase II.Interkinesis is followed by prophase II I.Hence the sequence is Meiosis I-Interkinesis-Meiosis II.

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

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Due to segregation, independent assortment and crossing over at the time of meiosis, daughter cells exhibit variation.

Amitosis is characteristic of -

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Amitosis is characteristic of lower organisms.

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

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The points of attachment between homologous chromosomes after their separation in diplotene are called chiasmata. The process of pairing of homologous chromosomes is called synapsis, transformation is process of gene trasfer in bacteria ,where exogenous genetic material is transferred from one bacrerial cell to another bacterial cell.

Meiosis is evolutionary significant because it results in

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Meiosis provides a chance for new combinations of chromosomes mainly by the phenomenon of crossing over and random distribution of homologous chromosomes between daughter cells.

Mitotic anaphase differs from metaphase in possessing

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In mitotic anaphase, the sister chromatids separate from each other and begin to move towards the opposite poles.

Necessity of Meiosis II is

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As a result of meiosis, 4 haploid gametes are produced. meiosis I results in segregation of homologus chromosomes. meiosis II is similar to normal mitosis, it results in formation of tetrad of cells i.e., four haploid daughter cells.It does not increase the number of chromosomes or cells in an organism . It produces haploid and not diploid cells.

Synapsis is seen during

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The characteristic events of each stage is as follows Leptotene-compaction of chromosomes. Pachytene-crossing over. Zygotene-synapsis. Diplotene-formation of chiasmata. Diakinesis-Terminalisation of chaismata.

In plant cells cytokinesis takes place by

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In plants cytokinesis takes place by cell plate formation which is laid down at the middle and then grows to the sides.Furrow formation is seen in animals.The furrow deepens and meets in the centre dividing the cell cytoplasm into two.

Nuclear membrane reappears in

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The nuclear envelope reappears during Telophase.

Microtubule is involved in the

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The spindle fibres involved in cell division is made of microtubules.

Best material for the study of mitosis in laboratory is

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Anther cells are used to study mitosis.

Bivalents in meiosis are

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Bivalent formation occurs in pachytene stage of meiosis. In this stage, two chromatids of homologous chromosome (Bivalent) later on forms a cross and now showing a tetravalent or tetrad stage.

Class 11th Biology - 10 Cell Cycle and Cell Division MCQs
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