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NEET Biology MCQ
Neet Biology Cell Cycle, Cell Division Mcq
Quiz 8
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Q.1
Nuclear envelope disappears during ... ... [ MPPMT 1995 ]
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a) Anaphase
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b) Metaphase
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c) Early prophase
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d) Late prophase
Explanation
Answer : (d)
Q.2
Homologous chromosomes separate during ... ... [ Odisha 2009 ]
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a) Metaphase I
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b) Anaphase I
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c) Metaphase II
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d) Anaphase II
Explanation
Answer : (b)
Q.3
Cell division is initiated by ... ... [ AFMC 2000 ]
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a) Cytokinin
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b) Auxin
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c) Gibberellin
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d) ABA
Explanation
Answer : (a)
Q.4
In meiosis, the daughter cells differ from parent cell as well as amongst themselves due to ... ..... [ AFMC 2005 ]
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a) Segregation, independent assortment and crossing over
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b) Segregation and crossing over
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c) Independent assortment and crossing over
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d) Segregation and independent assortment
Explanation
Answer : (a)
Q.5
The stage of cell cycle when cell decides to undergone differentiation is ... .... [ JIPMER 1998 ]
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a) G0
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b) G1
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c) G3
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d) G4
Explanation
Answer : (a)
Q.6
Kinetochore is ... ... [ Bih. PMT 2001 ]
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a) Granule within centromere
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b) Surface of centromere
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c) Constriction near chromosome end
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d) End of chromosome
Explanation
Kinetochore is a complex of proteins associated with the centromere of a chromosome during cell division, to which the microtubules of the spindle attach Answer : (a)
Q.7
When are spindle fiber proteins synthesized ... ... [ Odisha 2004 ]
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a) G1 -phase
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b) G2 - phase
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c) Metaphase
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d) S -phase
Explanation
Answer : (b)
Q.8
Paring of homologous chromosomes in zygotene is ... ... [ BHU 2003 ]
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a) Synapse
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b) Synapsis
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c) Crossing over
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d) Terminalisation
Explanation
Answer : (b)
Q.9
Histone protein synthesis occurs during ... ... [ CBSE 2005 ]
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a) G1-phase
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b) G2 -phase
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c) S-phase
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d) Prophase
Explanation
Answer : (c)
Q.10
Recombination between homologous chromosomes is completed by the end of ... ... [ CET Chd. 2009 ]
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a) Pachytene
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b) Leptotene
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c) Diplotene
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d) Zygotene
Explanation
Answer : (a)
Q.11
Significance of meiosis lies in ... ... [ MPPMT 1995 ]
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a) Production of genetic variability
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b) Maintaining constancy of chromosome number during sexual reproduction
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c) Reduction of chromosome number to one half
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d) All the above
Explanation
Answer : (d)
Q.12
Karyokinesis differs from cytokinesis as it involves division of ... ... [ AMU 1998 ]
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a) Cytoplasm
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b) Nucleus
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c) Both nucleus and cytoplasm
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d) Cell
Explanation
Answer : (b)
Q.13
match the columns
I
II
a) Initiation of spindle fibres
i) Anaphase I
b) Synthesis of RNA and protein
ii) Zygotene
c) Action of endonuclease
iii) G
1
-phase
d) Movement of chromatids towards opposite poles
iv) Pachytene
- -
v) Anaphase II
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a) a - ii, b - iii, c - iv, d - v
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b) a - iii, b - ii, c - i , d - v
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c) a - i, b - iii, c - v, d - iv
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d) a - i, b - iv, c - v, d - iii
Explanation
Answer : (a)
Q.14
Second division of meiosis is ... ... [ KCET 1998 ]
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a) Reductional division
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b) Multiplied division
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c) Equational division
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d) None of the above
Explanation
Answer : (c)
Q.15
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? ….[AIPMT 2014]
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a) OnlyG2
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b) G2 and M
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c) G0 and G1
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d) G1 and S
Explanation
Answer:(a)
Q.16
In 'S' phase of the cell cycle: ….[AIPMT 2014]
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a) chromosome number is increased.
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b) amount of DNA is reduced to half in each cell.
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c) amount of DNA doubles in each cell.
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d) amount of DNA remains same in each cell
Explanation
Answer:(c)
Q.17
The enzyme recombinase is required at which stage of meiosis: …[AIPMT 2014]
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a) Diplotene
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b) Diakinesis
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c) Pachytene
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d) Zygotene
Explanation
Answer:(c)
Q.18
Select the correct option: …[AIPMT 2015]
I
II
(a) Synapsis aligns homologous chromosomes
(i)Anaphase-II
(b) Synthesis of RNA and protein
(ii)Zygotene
(c) Action of enzyme recombinase
(iii) G2-phase
(d)Centromeres do not separate but chromatids move towards opposite poles
(iv)Anaphase-I
- - - -
(v)Pachytene
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a) a → (ii); b → (iii); c → (iv) ; d → (v)
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b) a → (ii) ; b → (i) ; c → (iii) ; d → (iv)
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c) a →(ii) ; b → (iii); c → (v) ; d → (iv)
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d) a →(i) ; b → (ii) ; c → (v) ; d → (iv)
Explanation
Answer:(c)
Q.19
A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has: …[AIPMT 2015]
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a) four times the number of chromosomes and twice the amount of DNA
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b) twice the number of chromosomes and twice the amount of DNA
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c) same number of chromosomes but twice the amount of DNA
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d) twice the number of chromosomes and four times the amount of DNA
Explanation
Answer:(d)
Q.20
Spindle fibers attach on to :- …[AIPMT-2016]
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a) Telomere of the chromosome
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b) Kinetochore of the chromosome
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c) Centromere of the chromosome
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d) Kinetosome of the chromosome
Explanation
Answer:(b)
Q.21
In meiosis crossing over is initiated at : …[AIPMT-2016]
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a) Pachytene
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b) Leptotene
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c) Zygotene
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d) Diplotene
Explanation
Answer:(a)
Q.22
Which of the following is not a characteristic feature during mitosis in somatic cells ? …[AIPMT-2016]
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a) Spindle fibers
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b) Disappearance of nucleolus
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c) Chromosome movement
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d) Synapsis
Explanation
Answer:(d)
Q.23
The complex formed by a pair of synapsed homologous chromosomes is called .. [NEET 2013]
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a) Equatorial plate
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b) Kinetochore
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c) Bivalent
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d) Axoneme
Explanation
Bivalent is paired homologous chromosome in zygotene stage. Answer:(c)
Q.24
Meiosis takes place in …[NEET 2013]
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a) Meiocyte
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b) Conidia
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c) Gemmule
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d) Megaspore
Explanation
The cells in which meiosis takes place are called meiocyte. Answer:(a)
Q.25
A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics. ….[NEET 2013]
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a) Telophase → Nuclear envelop reforms, golgi complex reforms
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b) Late Anaphase → Chromosomes move away from equatorial plate, golgi complex not present.
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c) Cytokinesis → Cell plate formed,mitochondria distributed between two daughter cells.
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d) Telophase → Endoplasmic reticulum and nucleolus not reformed yet.
Explanation
Telophase is reverse of prophase. Answer:(a)
Q.26
During cell growth, DNA synthesis takes place in:- …[NEET 2016]
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a) G2 phase
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b) M phase
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c) S phase
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d) G1 phase
Explanation
Answer:(c)
Q.27
When cell has stalled DNA replication fork, which checkpoint should be predominantly activated? …[NEET 2016]
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a) M
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b) Both G2/M and M
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c) G1/S
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d) G2/M
Explanation
Answer:(c)
Q.28
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 : …[NEET 2016]
Column-I
Column-II
a) Pachytene
i) Pairing of homologouschromosomes
b) Metaphase-I
ii) Terminalization of chiasmata
c) Diakinesis
iii) Crossing over takes place
d) Zygotene
iv) Chromosomes align at equatorial plate
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a) a → ii; b→ iv; c→ iii; d→ i
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b) a → iv; b→ iii; c→ ii; d→ i
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c) a →iii; b→ iv; c→ ii; d→ i
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d) a →i; b→ iv; c→ ii; d→ iii
Explanation
Answer:(c)
Q.29
Which of the following options gives the correct sequence of events during mitosis? ….[NEET- 2017]
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a) Condensation → nuclear membrane disassembly → crossing over → segregation → telophase
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b) Condensation → nuclear membrane disassembly → arrangement at equator →centromere division → segregation → telophase
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c) Condensation → crossing over → nuclear membrane disassembly → segregation → telophase
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d) Condensation → arrangement at equator → centromere division → segregation →telophase
Explanation
The correct sequence of events during mitosis would be as follows (i) Condensation of DNA so that chromosomes become visible occurs during early to mid-prophase. (ii) Nuclear membrane disassembly begins at late prophase or transition to metaphase. (iii) Arrangement of chromosomes at equator occurs during metaphase, called congression. (iv) Centromere division or splitting occurs during anaphase forming daughter chromosomes. (v) Segregation also occurs during anaphase as daughter chromosomes separate and move to opposite poles. (vi) Telophase leads to formation of two daughter nuclei. Answer:(b)
Q.30
Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur? ….[NEET- 2017]
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a) Chromosomes will not condense
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b) Chromosomes will be fragmented
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c) Chromosomes will not segregate
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d) Recombination of chromosome arms will occur
Explanation
Anaphase Promoting Complex (APC) is a protein necessary for separation of daughter chromosomes during anaphase. If APC is defective then the chromosomes will fail to segregate during anaphase Answer:(c)
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