CSIR UGC LIFE SCIENCE PRACTICE MCQ-CYTOLOGY

  1. In plants, cytokinesis takes place by

                (a) Cell plate formation     

                (b) Cleavage furrow formation

                (c) Endoreduplication

                (d) Meiosis II only

                (e) Mesosomal extensions

  2. A multinucleate condition in animals is referred to as

                (a) Synaptoneme                 (b) Syncytium

                (c) Syngeny                           (d) Adelphy

                (e) Syngenesium

  3. The number of cells formed from one cell at the end

        of Meiosis II are

                (a) 2                        (b) 4                        (c) 8

                (d) 16                     (e) Cannot be determined

  4. Pairing of chromosomes during meiosis takes place

         in

                (a) Leptotene                        (b) Zygotene

                (c) Pachytene                        (d) Diplotene

                (e) Diakinesis

  5. Bivalent formation or tetrad formation takes place

         during

                (a) Leptotene                        (b) Zygotene

                (c) Pachytene                        (d) Diplotene

                (e) Diakinesis

  6. The longest phase in prophase I of meiosis is

                (a) Leptotene                        (b) Zygotene

                (c) Pachytene                        (d) Diplotene

                (e) Diakinesis

  7. The sites at which crossing over occurs between the

          non-sister chromatids of the homologous

          chromosomes is called

                (a) Recombination nodule

                (b) Synaptonemal complex

                (c) Secondary constriction

                (d) Primary constriction

                (e) Axoneme

  8. The enzyme involved in crossing over is

                (a) Helicase                           (b) Permease

                (c) Transacetylase                (d) Recombinase

                (e) Replicase

  9. The place at which the chromosomes involved in

         crossing over remain attached after crossing over is

         complete and synaptonemal complex dissolves is

         called

                (a) Centromere                    

                (b) Kinetochore

                (c) Chiasmata                      

                (d) Secondary cosntrictions

                (e) Nucleoli

   10. The transition stage of meiotic prophase I to

         metaphase I is

                (a) Leptotene                        (b) Zygotene

                (c) Pachytene                        (d) Diplotene

                (e) Diakinesis

  

   11. The shortest phase in the cell cycle is

                (a) G1                     (b) G2                     (c) S

                (d) M                      (e) G0

   12. The interphase of nucleus comprises

                (a) G1 and G2 phaase          (b) G1 to S phase

                (c) G1 to G2 phase               (d) S, M and G1 phase

                (e) None of these

   13. What state of cell cycle is attained when the cell has

          undergone differentiation

                (a) G0                     (b) G1                     (c) G3

                (d) G4                     (e) M

   14. Restriction point for cell cycle takes place in

                (a) G1 phase                          (b) G2 phase

                (c) S phase                             (d) M phase

                (e) Mitotic prophase

   15. The significance of mitosis is that it can

                (a) Take place in all parts

                (b) Be completed very rapidly

                (c) Produce identical cells

                (d) Occur under adverse conditions

                (e) Occur to decrease the cell cycle events

   16. In cell cycle process, the term generation time is

         used to refer the time required for

                (a) Generation of DNA

                (b) Generation of proteins

                (c) Karyokinesis

                (d) Completion of cell cycle

                (e) Cytokinesis

   17. The most active phase of Nucleus is

                (a) Interphase                        (b) Prophase

                (c) Metaphase                       (d) Anaphase

                (e) Telophase

   18. Chromosomes are best studied by

                (a) Compound microscope

                (b) Colorimetry

                (c) SEM

                (d) X-ray diffraction 

                (e)Ultracentrifugation

   19.A phase just opposite to prophase is

                (a) Interphase                        (b) Interkinesis

                (c) Telophase                        (d) Metaphase

                (e) Prometaphase

   20. Spindle fibres are made up of

                (a) Flagellin                          (b) Tubulin

                (c) Actin                                (d) Myosin

                (e) Cutin