Calcium dependent Kinases can control 

  • cell cycle activities

  • DNA replication 

  • Cell surface receptors

  • membrane structure

What is the correct sequence of the steps given here ? Also work out the process depicted in the steps.
(i) Homologous chromosomes move toward opposite poles of the cell; chromatids do not separate
(ii) Chromosomes gather together at the two poles of the cell and the nucleare membranes reform 
(iii) Homologous chromosomes pair and exchange segments 
(iv) Homologous chromosomes align on a central plate
(v) The haploid cells separate completely

 
  • The correct sequence is III→IV→I→II→V and the process is meiosis-I

  • The correct sequence is II→I→V→IV→III and the process is mitosis

  • The correct sequence is IV→I→III→II→V and the process is meiosis-I

  • the correct sequence is II→V→IV→I→II and the process is mitosis

During meiosis, the sister chromatids separate during:

  • Anaphase II    

  • Anaphase I     

  • The S phase    

  • Synapsis

Chromosomes decondense into diffuse chromatin:

  • At the end of telophase                

    (2) At the beginning of prophase

  • 2

  • At the end of interphase              

    (4) At the end of metaphase

  • 4

The total DNA content of each daughter cell is reduced during meiosis because:

  • Chromosomes do not replicate during the interphase preceding meiosis I

  • Chromosomes do not replicate between meiosis I and II

  • Half of the chromosomes from each gamete are lost during fertilization

  • Chromosome arms are lost during crossing over

Which of the following does not occur during mitotic prophase?

  • Disappearance of the nuclear envelope

  • Chromosome condensation

  • Migration of centrosomes towards the cell poles

  • Synapsis of homologous chromosomes

Which of the following is not true for sister chromatids?

  • They arise by replication during S phase

  • They segregate from each other during each mitotic anaphase

  • The usually contain identical versions of the same genetic information

  • They segregate from each other during meiosis I

Which of the following statements is True?

  • Cell plate represents the middle lamella between the walls of two adjacents cells

  • At the time of cytokinesis, organelles like mitochondria and plastids get distributed between the daughter cells

  • Cytokinesis in plant cell is centrifugal and takes place by cell-plate formation while animal cells by furrowing / cleavage and is centripetal

  • All are correct

Crossing is an enzyme-mediated process. The enzyme is:

  • DNA ligase      

    (2) Recombinase  

    (3) RNAase           

    (4) DNAase

  • 2
  • 3
  • 4

Match Column-I with Column-II:
Column-I                                                                                 Column-II
I. Chromosomes are moved to spindle equator                     A. Pachytene
II. Centromere splits and chromatids apart                            B. Zygotene
III. Pairing between homologous chromosomes takes place C. Anaphase
IV. Crossing between homologous chromosomes                 D. Metaphase

  • I-A, II-B, III-C, IV-D                               

  • I-B, II-C, III-D, IV-A

  • I-D, II-C, III-B, IV-A                               

  • I-C, II-A, III-D, IV-B

Which event is not associated with prophase I?

  • Synizesis                  

  • Synapsis                  

  • Segregation    

  • Terminalization

A cell cycle includes:

  • Interphase + M-phase / divisional phase

  • Prophase + Metaphase + Anaphase + Telophase

  • G1 + S + G2 – phase

  • Karyokinesis + Cytokinesis

Interphase:

  • Includes karyokinesis and cytokinesis

  • Some time called resting phase, is the preparatory phase for division in which cell undergoes growth and DNA replication in an order

  • Is the shortest phase in which biomolecules are synthesised very fast

  • Includes 5% duration of the cell cycle

Which one is correct about S-phase (synthetic phase)?
I. It occurs between G1 and G2
II. It marks the period during which DNA replicates
III. At the end of this phase DNA is doubled but the number of chromosomes remains unchanged
IV. As the DNA is doubled in this phase number of chromosomes is also doubled
V. Centrioles replicate in this phase
VI. Amount of DNA changes from 2C to 4C
VII. It is pre G2 and post G1 phase

  • I, II, IV, V, VI, VII are correct                 

  • I, II, III, V, VI, VII are correct

  • All are correct                                       

  • Only IV is correct

The sequence of events by which a cell duplicates its genome, synthesises other constituents of cells and eventually divides into daughter cells is termed as:

  • Interphase                                   

  • M-phase

  • Karyokinesis + Cytokinesis             

  • Cell cycle

Which one is correct for G0 stage?
I. It is a quiescent stage
II. In this phase cell cycle is stopped
III. G0 cells in this stage do not grow or proliferate but metabolically active
IV. G0 cells can divide in response to some stimulus

  • All are correct                         

  • I, II, III are correct

  • I, II are correct                       

  • Only I and IV are correct

At metaphase of mitosis, each chromosome consists of _______ chromatid(s) _______ centromere(s) ________ kinetochore(s) and _______ molecules of DNA:

  • 2, 1, 2, 2        

  • 2, 2, 2, 2       

  • 2, 1, 1, 1                  

  • 2, 1, 2, 1

In human cells chromosomes are:

  • Always condensed during the entire cell cycle

  • Different in different tissues

  • Of the same size and shape

  • Visible only during mitosis and meiosis

In prophase mitosis, which one of the following events occurs in animal cells but not in plant cells?

  • Centrioles migrate to opposite sides of the nucleus

  • Homologous chromosomes do not associate

  • The nuclear envelope (membrane) breaks down

  • Nucleoli disappear

Synaptonemal complex is more conspicious at:

  • Zygotene        

    (2) Pachytene      

    (3) Diplotene         

    (4) Leptotene

  • 2
  • 3
  • 4

Centrosomes are:

  • Constricted regions of chromosomes

  • Regions where microtubules polymerise

  • Part of Cilia

  • The central part of the same cell

Cellular structures which disappear during late prophase and reappear during telophase are:

  • Mitochondria and spindle fibres   

    (2) Plasma membrane

  • 2

  • Nuclear membrane and nucleolus 

    (4) Plastid

  • 4

Given:

  • Chromatid                                    2. Monad
  • 3. Dyad                                            4. Daughter chromosome
  • The correct sequence in cell division is:
  • (a) 1, 2, 3, 4               (b) 2, 3, 1, 4              (c) 3, 2, 1, 4              (d) 4, 3, 2, 1

Cytokinesis in animal cell takes place by _______; in _______ direction while in plant cell by _______; in _______ direction:

  • Furrowing, centrifugal, cell plate, centripetal

  • Furrowing, centripetal, cell plate, Centrifugal

  • Cell plate, centrifugal, furrowing, centripetal

  • Cell plate, centripetal, furrowing, centrifugal

Liquid endosperm in coconut is resulted due to:

  • Karyokinesis followed by cytokinesis

  • Failure of karyokinesis followed by cytokinesis

  • Karyokinesis twice followed by single cytokinesis

  • Karyokinesis is not followed by cytokinesis

Label the structure indicated by lines (i), (ii), (iii) and (iv):

  • (i) - Chromatid, (ii) Centriole, (iii) Centromere, (iv) Chromosome

  • (i) - Chromomosome, (ii) Centriole, (iii) Centromere, (iv) Chromatid

  • (i) - Chromatid, (ii) Centromere, (iii) Centriole, (iv) Chromosome

  • (i) - Chromomosome, (ii) Centromere, (iii) Centriole, (iv) Chromatid

The members of a homologous pair of chromosomes:

  • Are identical in size and appearance

  • Contain identical genetic information

  • Separate to opposite poles of the cell during mitosis

  • Are found only in haploid cells

One difference between mitosis and meiosis I is that:

  • Homologous chromosome pairs synapse during mitosis

  • Chromosome do not replicate in the interphase preceding meiosis

  • Homologous chromosomes pairs synapse during meiosis but not mitosis

  • Spindle composed of microtubules are not required during meiosis

Chromosome number is reduced during meiosis because the process consists of:

  • Two cell divisions without any chromosome replication

  • A single cell division without any chromosome replication

  • Two cell divisions in which half of the chromosomes are destroyed

  • Two cell divisions and only a single round of chromosome replication

Which of the following is false?

  • The mitotic spindle is composed of microtubules

  • In plant cells, cytokinesis is accomplished by the formation of a cell plate

  • The distribution of mitochondria between the daughter cells during cytokinesis is random

  • Chromatin condenses to form discrete, visible chromosomes early in G1

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