Monday, October 14, 2013

CELL CYCLE AND CELL DIVISION

1.    M phase of cell cycle starts with
    1) Duplication of DNA
    2) Karyokinesis
    3) Cytokinesis
    4) Division of chromosomes
2.    During this phase of cell cycle, cell is metabolically active without duplication of DNA
    1) M-phase    2) S-phase
    3) G1-phase    4) G2 phase
3.    The amount of DNA per cell remains same during
    1) S, G2 and metaphase
    2) G1, G2, M phase
    3) Anaphase, Telophase, G1 phase
    4) a and c
4.    The amount of DNA in a cell in G1 phase is
    1) Half that of S-phase
    2) Half that of G2 phase
    3) Half that of prophase        4) All
5.    Proteins and RNA synthesis occurs during
    1) S phase and G1phase    2) G1 and G2 phase
    3) G1 and M phase    4) S and G2 phase
6.    Mitotic division is also called equational division because
    1) Chromosome number is daughter cells is same
    2) Chromosome number in daughter cells and parental cell is same
    3) Amount of DNA is same is both the daughter cells
    4) Amount of DNA is same both daughter and parental cell
7.    Two DNA molecules in a cell are observed but not distinct is these phases
    1) S and G2    2) G2, prophase
    3) Metaphase and anaphase
    4) G1 and G2 phases
8.    Prophase is characterised by
    1) Condensation of chromosomal material
    2) Centrioles move towards opposite poles of the cell
    3) Initiation of assembly of mitoticspindle
    4) All
9.    Spindle fibres are chemically
    1) Carbohydrates    2) Proteins
     3) Proteins and carbohydrates
    4) Proteins and fats
10.    Chromosomes are scattered in the cytoplasm during
    1) Early metaphase
    2) Late metaphase
    3) Early anaphase
    4) Late anaphase
11.    Kinetochores are disc shaped structures associated with
    1) Telomeres    2) Centromeres
    3) Chromomeres   
    4) secondary constriction
12.    Spindle fibres are attached to kinetochores of chromosomes in
    1) Metaphase    2) Anaphase
    3) Telophase    4) a and b
13.    Chromatids of each chromosome and separated during
    1) Anaphase    2) Anaphase-I
    3) Anaphase-II    4) a and b
14.    Chromosomes with two chromatids move towards poles during
    1) Anaphase-I    2) Anaphase
    3) Anaphase-II    4) Metaphase
15.    Chromosomes with two chromatids move towards equator of spindle during
    1) Anaphase    2) Anaphase-I
    3) Anaphase-II    4) Metaphase
16.    The following character is not observed during Anaphase
    1) Centromere splits
    2) Chromatids move towards equator
    3) Chromatids move towards poles
    4) Centromeres of chromatids are oriented towards poles
17.    Chromosomes decoundense and loose their individuality during
    1) Prophase    2) Metaphase
    3) Anaphase    4)  Telophase
18.    The following are reformed during Telophase
    1) Nucleolus    2) Golgi complex
    3) ER    4) All
19.    Precursor of cell wall is
    1) Middle lamellum    2) Cell plate
    3) Mitotic spindle    4) Metaphase plate
20.    Signature of mitosis is
    1) Growth of multicellular organisms
    2) Maintains nucleo-cytoplasmic ratio
    3) Cell repair    4) All
21.    Meiosis occurs during
    1) Sporogenesis    2) Gametogenesis
    3) Embryogenesis    4) a and b
22.    Parental chromosomes produce two identical sister chromatids during
    1) G1 phase    2) G2 phase
    3) S-phase    4) Prophase
23.    The following stage is incorrect with reference to meiosis
    1) Nucleus divides twice
    2) Chromosomes divide twice
    3) Chromosomes divide once
    4) Centromere divides once
24.    DNA replication occurs
    1) During meiosis    2) Before meiosis
    3) After meiosis    4) During mitosis
25.    Prophase-I is divided into five phases based on
    1) Chromosome number
    2) Time duration
    3) Chromosome behavior
    4) Crossing over patterns
26.    Longest phase of meiosis is
    1) Prophase-I    2) Prophase-II
    3) Anaphase-I    4) Metaphase-I
27.    Chromosomes are first visible under light microscope during
    1) Leptotene    2) Zygotene
    3) Pachytene    4) Diplotene
28.    Recombinase enzyme is active during
    1) Prophase-I    2) Prophase-II
    3) Metaphase-I    4) Metaphase-II
29.    Number of recomibination nodules is relatively more in
    1) Leptotene    2) Zygotene
    3) Pachytene    4) Diakinesis
30.    Diakinesis is mainly characterized by
    1) Synapsis    2) Crossing over
    3) Seggregation    4) Terminalization
31.    Chromosomes with two chromatids move towards poles in
    1) Anaphase    2) Anaphase-I
    3) Anaphase-II    4) Metaphase-I
32.    The following is incorrect with regard to meiosis
    1) Nuclear envelope disappears twice
    2) Nuclear envelope reappers twice
    3) DNA content of daughter cells is reduced to 1/4th of Parental cell
    4) DNA duplicates once
33.    Mitotic cycle can be best observed in _____
    1) Meristematic cells
    2) Sievetubes
    3) Root cap cells
    4) Pollen mother cells
34.    Find the correct statement with respect to replication of DNA in cell division
    1) It occurs during G1-phase of interphase
    2) New strands complimentary to old strands are synthesized with the help of endonucleases
    3) Two strands of DNA unwind from each other due to DNA polymerase
    4) It occurs by semi-conservative method
35.    In a Meristematic cell, DNA quantity becomes double in
    1) G1 sub phase    2) S-sub phase
    3) G2-sub phase    4) Prophase
36.    Centromeric division occurs during
    1) Prophase    2) Metaphase
    3) Anaphase    4) Interphase
37.    A barrel shaped structure organised at interzonal region by remaining spindle fibers at the end of telophase is
    1) Tonoplast    2) Phragmoplast
    3) Mitoplast    4) Tyloses
38.    When compared to G1 phase of mitosis quantity of DNA in nucleus of each daughter cell will be
    1) Half as much as in parent nucleus
    2) Same as much as in parent nucleus
    3) Twice as much as parent nucleus
    4) Highly variable
39.    Meiosis is characterised by
    1) Two nuclear division with chromosomes divide twice
    2) Two nyclear division (number of nuclei divides is 3) with chromosome dividing one time
    3) Two nuclear division with chromosome dividing 4 times
    4) One nuclear division with chromosome dividing one time
40.    The subphase of prophase-I showing enlargement of nucleus and nucleolus respectively are
    1) Leptotene, Zygotene
    2) Zygotene, Pachytene
    3) Zygotene, Dipoltene
    4) Leptotene, Diplotene
41.    Enzymes help in crossing over
    1) Endonuclease and ligase
    2) Restriction endonuclease and ligase
    3) Endonucleae and exonuclease
    4) Polymerase and endonuclease
42.    What is the ratio of the number of chromatids chromosomes, bivalents and centromeres respectively in a cell during metaphase-I ?
    1) 1:2:2:1    2) 4:2:2:1
    3) 4:2:1:2    4) 2:1:2:1
43.    Chromosomes of the bivalent are fused(joine4) by their chiasmata near the telomeric ends during
    1) Pachytene    2) Zygotene
    3) Metaphase-I    4) Anaphase-I
44.    Movement of bivalents towards the periphery of the nucleus and their movement towards equator of the meiocyte occur respectively during
    1) Diakinesis and anaphase-I
    2) Diplotene and diakinesis
    3) Leptotene and diakinesis
    4) diakinesis and metaphase
45.    Number of meiotic division required to produce 100 seeds in an angiospermic plant is
    1) 25    2) 50    3) 100    4) 125
46.    During meiosis, when the paternal and maternal chromosomes brought together and separated respectively?
    1) Zygotene & Anaphase-II
    2) Pachase -II & Anaphase-I
    3) Zygotene & Anaphase-I
    4) Leptotene & Telophase-I
47.    Number of spindle apparati formed during the formation of one hundred microspores from microspore mother cells is
    1) 25  2)75   3) 50    4) 100
48.    How many reductional divisions are required to form 400 synergids?
    1) 400    2) 300    3) 200    4) 100
49.    The ratio of chromosomes moving to each pole during Anaphase-II to those moving to each pole during Anaphase-I
    1) 1:1     2) 1:2    3) 2:1    4) 1:4
50.    During meiosis spindle formation is initiated during
    1) Zygotene of prophase-I
    2) Pachytene of Prophase-I
    3) Metaphase-I
    4) Interphase
51.    If a bacterial cell divides once in every minute, it takes one hour to fill a cup.  How much time will it take to fill half of the cup?
    1) 30 min    2) 59 min
    3) 58 min    4) 15 min
52.    In a flowering plant the largest number of haploid cells occurs in
    1) Ovule    2) Microsporangium
    3) Root apex    4) Cambium
ASSERTION & REASON TYPE
    a) Both A and R are true and R is the correct explanation of A
    b) Both A and R are true and R is not the correct explanation of A
    c) A is true but R is false
    d) A is false and R is false
53.    A : Division of nucleus is followed by the division of cytoplasm in free nuclear division
    R : Functioning of Golgi complex leads to free nuclear division
54.    A : Event of pachytene leading to evolution is linkage and crossing over
    R : During crossingover, genetic material is exchanged between sister chromatids of homologous chromonsomes
55.    A : Events of telophase are reverse to those of metaphase
    R : During prophase, nucleus appears and in telophase the nucleus disappears
56.    A : Daughter chromosomes move to oppositite poles in Anaphase
    R : During Anaphase, centromeres divide & spindle fibres contract
57.    A : Daughter cells formed in mitosis are gentically identical
    R : Chromatids are formed in late prophase subphase
58.    A : Variations occur in sexually reproducing organisms
    R : Crossing over and disjunction occur during meiosis in sexual reproduction
59.    A : DNA replication does occur between Meiosis-I and Meiosis-II
    R : In Meiosis nucleaus divides once but chromosomes divide twice
60.    A : During meiosis homologous chromosomes are separated in Anaphase-I
    R : During meiosis the two chromatids of a chromosome are separated in Anaphase-II
61.    A : Meiosis maintains constant number of Chromosomes through out the generations and also help in evolution
    R : In meiosis, chromosome number is reduced and recombinations of genes take place
62.    A : Chromatids of a chromosomes of prophase II are not exactly the same as those of a chromosome of early prophase-I
    R : Crossing over which occurs in mid prophase I brings about a change in the genetic constitution of the chromatids
63.    A : In Meiosis-I the chromosome number is reduced to half
    R : Disjunction of chromosomes genomes occur during Anaphase-I
64.    A : In diakinesis, the chiasmata lie very close to telomeres of the homologues
    R : In diakinesis, bivalents move to the periphery of the nucleus
65.    Choose the correct combination
    List-I    List-II
    A) Walter sotton    I) Discovered penicillin
    B) Thomas Hung    II) Discovered             chromosoma I  basis of
        heridity
    C) James Watson    III) Described the
        phenomon of linkage
        and crossing over
    D) Alexander    IV) Discovered          Fleming    double helical structure
        of DNA
         A      B      C     D
    1)  I       IV     II     III
    2)  II     III      I     IV
    3)  III     II     IV     I
    4)  II      III    IV     I
66.    Choose the correct match
    List-I    List-II
    A) V-shaped     I) telocentric
    chromosome   
    B) L-shaped    II) metacentric
    chromosome
    C) J-shaped    III) sub-metacentric
    chromosome
    D) I-shaped    IV) acrocentric
    chromosome
         A       B      C      D
    1)  IV      I      III     II
    2)  III     II       I      IV
    2)  I       IV     III     II
    4)  II     III      IV     I
67.    Choose the correct match
    List-I    List-II
    A) Zygotene    I) Crossing over
    B) Pachytene    II) Terminalization
    C) Diplonema    III) Formation of             hivalent
    D) Diakinesis    IV) Repulsion of             paired chromosomes
         A        B      C      D
    1)  I        III      II     IV
    2)  III      I       IV     II
    2)  II       IV     III     I
    4)  IV     II        I      III
68.    Identify the correct sequence of the following phases during cell cycle
    I. M-phase    II. S-subphase
    III. G2-subphase    IV. G1-subphase
    1) IV,II,III,I    2) I,IV,II,III
    3) IV,III,II,I    4) II,IV,III,I
69.    Study the following lests
    List-I    List-II
    A) Diplotene    I) Increae in the size of
        nucleous
    B) Zygotene    II) Homologous
        choromosomes
        are long and thread like
    C) Pachytene    III) condensation,
        contraction and                                  thickening chromosomes
    D) Leptotene    IV) Occurenec of             crossing over
        V) chromosomes             released into cytoplasm
    The correct match is
         A        B      C      D
    1)  III      I       IV     II
    2)  III      I      IV     V
    2)  V       IV     I       II
    4)  II       IV    V      III
70.    Match the following lists
    List-I    List-II
    A) Doubling the     I) G1-phase
    number of    
    chromosomes
    B) Doubling the cell    II) S-phase
    organelles
    C) Doubling the     III) G2-phase
    DNA    IV) Anaphase
    D) Doubling the     V) Cytokinesis
    number of cells
    The correct match is
         A       B      C      D
    1)  II      I       IV     III
    2)  II     III     IV     V
    2)  IV    III     II      V
    4)  IV     I      II      III
71.    Study the following table
    List-I    List-II
    A) Complete     I) Zygotene
    disapperance of
    chriasmata
    B) Repulsion of     II) Anaphase-I
    homologous
    chromosomes
    C) Maximum attractive    III) Pachytene
    forces between homologous
    chromosomes
    D) Displacement of     IV) Diplotene
    chiastmata   
        V) Diakinesis
    The correct match is
         A        B      C      D
    1)  V      III       I     IV
    2)  V      II      III     IV
    2)  II       IV     I       V
    4)  II       I       V      III
72.    List-I    List-II
    A) Anaphase-I    I) Repulsion between
                             homologus chromosomes
    B) Pachytene    II) Attraction between
                            homologous chromosomes
    C) Zygotene    III) Exchange between
                            homologous chromosomes
    D) Diplotene    IV) Separation of
                            homologous chromosomes
    The correct match is
         A      B      C      D
    1)  I       II     III     IV
    2)  III    IV    II       I
    2)  IV    III     I       II
    4)  IV    III    II       I
73.    Arrange the various phenomena of meiosis in a correct sequence
    A) Pairing of homologous chromosomes
    B) Separation of genomes
    C) Recombination between two chromosomes
    D) Chaismata
    1) D,B,A,C    2) D,C,A,B
    3) A,C,D,B    4) C,D,B,A
74.    Match the following lists:
    List-I    List-II
    A) Anaphase-I     I) One spindle apparatus
    B) Anaphase-II    II) Separation of two
        genomes
    C) Metaphase-II    III) Two spindle             apparatii
    D) Telophase-II    IV) Separation of two
        chromatids
                                V) Four daughter nuclei
    The correct match is
         A        B      C       D
    1)  V      IV       III      II
    2)  II      IV      III      V
    3)  I       IV      V       III
    4)  IV     II       I        III

key
1) 2    2) 3    3) 4    4) 4    5) 2   
6) 2    7) 1    8) 4    9) 2    10) 1    11) 2    12) 4    13) 4    14) 1    15) 4    16) 2    17) 4    18) 4    19) 2    20) 4    21) 4    22) 3    23) 2    24) 2    25) 3    26) 1    27) 1    28) 1    29) 3    30) 4    31) 2    32) 4    33) 1    34) 4    35) 2    36) 3    37) 2    38) 2    39) 2    40) 1    41) 1    42) 3    43) 3    44) 4    45) 4    46) 3    47) 2    48) 3    49) 1    50) 1    51) 2    52) 2    53) 4    54) 4    55) 4    56) 1    57) 2    58) 1    59) 4    60) 2    61) 1    62) 1    63) 1    64) 2    65) 4    66) 4    67) 2    68) 1    69) 1    70) 3    71) 3    72) 4    73) 3    74) 2

   




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