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NEET CRASH COURSE PAPER -6 | Cell & Structural Components
1 . Refer the given diagram showing cell cycle and answer the questions that follow .
( i ) If the chromosome number at X is 2n , what will be the number of chromosomes at Y ?
( ii ) Which phase is the longest phase of M phase ?
( i ) ( ii )
( a ) 2n Telophase
( b ) 4n Metaphase
( c ) 2n Prophase
( d ) 4n Anaphase
2 . Read the following statements and select the correct option .
Statement 1 : Synthesis of DNA takes place in the S - phase of interphase . Statement 2 : Every chromosome , during metaphase has two chromatids .
( a ) Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1 .
( b ) Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1 .
( c ) Statement 1 is correct and statement 2 is incorrect .
( d ) Both statements 1 and 2 are incorrect .
3 . Which of the following is the correct sequence of meiotic prophase I ?
( a ) Leptotene → pachytene → zygotene → diplotene → diakinesis
( b ) Leptotene → zygotene → diplotene → pachytene → diakinesis
( c ) Leptotene → zygotene → pachytene → diplotene → diakinesis
( d ) None of these
4 . Select the correct matches among the following .
( A ) S phase - DNA replication
( B ) Zygotene - Synapsis
( C ) Diplotene - Crossing over
( D ) Meiosis - Both haploid and diploid cells
( E ) G₂ - phase - Quiescent stage
( a ) A and B
( b ) C and D
( c ) C and E
( d ) A , C and E
5. Select the correct option with respect to mitosis .
( a ) Chromatids separate but remain in the centre of the cell in anaphase .
( b ) Chromatids start moving towards opposite poles in telophase .
( c ) Golgi complex and endoplasmic reticulum are still visible at the end of prophase .
( d ) Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase .
6 . The given diagram depicts cell plate method of cytokinesis in plant cells . Identify A , B and C.
A B C
( a ) Daughter nucleus Phragmoplast Vesicles
( b ) Daughter nucleus Vesicles Phragmoplast
( c ) Parent nucleus Vesicles Phragmoplast
( d ) Parent nucleus Phragmoplast Vesicles
7 . The given figures represent types of meiosis . Identify them and select the correct option .
A B C
( a ) Zygotic Sporic Gametic
( b ) Gametic Sporic Zygotic
( c ) Sporic Zygotic Gametic
( d ) Zygotic Gametic Sporic
8 . Consider the given cellat metaphase - I stage undergoing normal meisois . Which of the following gametes will not be formed from this cell ?
9. Mitotic stages are not observed in
( a ) Solanum
( b ) E.coli
( c ) Saccharomyces
( d ) Chlorella .
10. Identify the given stages of mitosis and select the correct option .
A B C D
( a ) Prophase Metaphase Telophase Anaphase
( b ) Metaphase Anaphase Prophase Telophase
( c ) Anaphase Metaphase Prophase Telophase
( d ) Prophase Metaphase Anaphase Telophase
11. Syncytium formation occurs if
( a ) karyokinesis is not followed by cytokinesis
( b ) cytokinesis is not followed by karyokinesis
( c ) no karyokinesis takes place
( d ) both karyokinesis and cistokinesis are prevented .
12. Match column I and II and select the correct match from the codes given below .
Column I Column II
1 . Meiosis I P. Reductional division
2 . Meiosis II Q. Zygotene
3 . Prophase II R. Equational division
4 . Anaphase II S. The nuclear membrane disappears
5 . Prophase I T. Splitting of the centromere
1 2 3 4 5
( a ) P S T Q R
( b ) P R S T Q
( c ) S P Q R T
( d ) Q P R T S
13. A mitogen of animal origin is
( a ) cyanide
( b ) azide
( c ) chalone
( d ) platelet derived growth factor .
14. The given graph shows thechange in DNA content during various phases ( A to D ) in a typical mitotic cell cycle . Identify the phases and select the correct option .
A B C D
( a ) G₂ G₁ S M
( b ) G0 S G₂ M
( c ) G₁ S G₂ M
( d ) M G₁ S G₂
15. Which of the following statements is correct with respect to mitosis ?
( a ) Cytokinesis and karyokinesis occur together .
( b ) Cytokinesis and karyokinesis occur randomly .
( c ) Cytokinesis precedes karyokinesis
( d ) Karyokinesis precedes cytokinesis
16. Which of the following is not a function of mitotic cell division ?
( a ) Production of gametes
( b ) Asexual reproduction
( c ) Growth
( d ) Genetic stability
17. Match Column I with Column II and select the correct option from the codes given below .
Column I Column II
A. Terminalisation of chiasmata 1. Pachytene
B. Exchange of segments of chromatids 2. Zygotene
C. Synapsis of homologous chromosomes 3. Diakinesis
D. Appearance of chiasmata 4. Leptotene
5. Diplotene
A B C D
( a ) 4 2 3 1
( b ) 3 1 2 5
( c ) 2 5 1 3
( d ) 2 4 3 1
18. Which one induces cell division ?
( a ) Critical decrease in surface - volume ratio
( b ) Critical decrease in nucleocytoplasmic ratio
( c ) Both ( a ) and ( b )
( d ) Decrease in cell size
19. For a somatic cell with 2n = 4 , which of the following is true ?
( Note G₁- growth phase 1 , G₂ - growth phase 2 , M - metaphase , P - prophase and T - telophase )
( a ) ( Number of chromatids ) G₂ = 4 ; ( Number of chromosomes ) G₁ = 4
( b ) ( Number of chromatids ) G₁ = 2 ; ( Number of sister chromatids ) T = 8
( c ) ( Number of chromatids ) P = 8 ( Number of chromosomes ) G₂ = 4
( d ) ( Number of chromatids ) G₂ = 4 ; ( Number of chromosomes ) M = 8 .
20. Colchicine results in doubling of chromosome number because of
( a ) nonformation of spindle
( b ) double replication of chromosomes
( c ) nonpairing of chromosomes
( d ) splitting of chromosomes .
21. What is the approximate duration of cell cycle for a mammalian cell ?
( a ) 90 min
( b ) 24 hrs
( c ) 24 days
( d ) 12 hrs
22. Which of the following statements are correct for cell cycle ?
I. Cell cycle is the sequence of events involving growth and division of a cell from the time of its formation to its own division into daughter cells .
II . Cell growth ( in terms of cytoplasmic increase ) is a continuous process .
III . DNA synthesis occurs only during one specific stage in the cell cycle .
IV . The replicated chromosomes ( DNA ) are distributed to daughter nuclei during cell division .
( a ) I and III only
( b ) I and II only
( c ) III and IV only
( d ) I , II III and IV
23. What is the approximate percentage duration of cell cycle that comes under interphase in humans ?
( a ) 99 %
( b ) 95 %
( c ) 25 %
( d ) 5 %
24. Arrange the following events of meiosis in a proper sequence and select the correct option .
I. Terminalisation II . Crossing over III . Synapsis IV . Disjunction of genome
( a ) IV , III , II and I
( b ) III , II , I and IV
( c ) II , I , IV and III
( d ) I , IV , III and II
25. Which one of the following precedes re - formation of the nuclear envelope during M - phase of the cell cycle ?
( a ) Decondensation of and chromosomes reassembly of the nuclear lamina .
( b ) Transcription from chromosomes and reassembly of the nuclear lamina .
( c ) Formation of the contractile ring and Formation of the phragmoplast .
( d ) Formation of the contractile ring and transcription from chromosomes .
26. When the number of chromosomes is already reduced to half in the first reductional division of meiosis , what is the necessity of second meiotic division ?
( a ) The division is required for the formation of four gametes .
( b ) Division ensures equal distribution of haploid chromosomes .
( c ) Division ensures equal distribution of genes on chromosomes .
( d ) Division is required for the segregation of replicated chromosomes .
27. Which of the following are correctly matched pairs ?
I. Leptotene - The chromosomes become invisible .
II . Zygotene - Pairing of homologous chromo somes .
III . Pachytene - Formation of lampbrush chromo - somes .
IV . Diakinesis - Terminalisation of chiasmata takes place .
( a ) I and II
( b ) III and IV
( c ) II and IV
( d ) II and III
28. Which of the following statements are correct for meiosis ?
I. Meiosis is a double division . It gives rise to four cells .
II . The cells undergoing meiosis may be haploid or diploid .
III . No bouquet stage is recorded .
IV . Pairing or synapsis of homologous chromosomes takes place during zygotene of prophase - I and continues upto metaphase - I .
( a ) I only
( b ) I and IV
( c ) II and III
( d ) All of these
29. If a tissue has at a given time 1024 cells , how many cycles of mitosis had the original parental single cell undergone ?
( a ) 10
( b ) 15
( c ) 20
( d ) 24
30. A cell undergoing meiosis produces four daughter cells , two of which are aneuploids , while two are haploid . This can occur due to
( a ) non - disjunction during first meiotic division only
( b ) non - disjunction during second meiotic division only
( c ) non - disjunction during either first or second meiotic divisions .
( d ) non - disjunction during both first and second meiotic divisions
31. Match the graphs ( P - S ) showing quantitative change in DNA content at each of four stages in the cell cycle ( G₁ , S , G₂ , M ) with the given statements regarding cell activity and response .
I. Taxol treatment , which prevents microtubule depolymerisation , arrests the cell at this stage .
II . With a mitogen treatment , such as an growth factor , an arrested cell at this proceeds to the next stage of the cell cycle .
III . The cell cycle check point at this stage confirms that DNA duplication is complete before the cell proceeds to the next stage .
( b ) Division ensures equal distribution of haploid chromosomes .
( c ) Division ensures equal distribution of genes on chromosomes .
( d ) Division is required for the segregation of replicated chromosomes .
27. Which of the following are correctly matched pairs ?
I. Leptotene - The chromosomes become invisible .
II . Zygotene - Pairing of homologous chromo somes .
III . Pachytene - Formation of lampbrush chromo - somes .
IV . Diakinesis - Terminalisation of chiasmata takes place .
( a ) I and II
( b ) III and IV
( c ) II and IV
( d ) II and III
28. Which of the following statements are correct for meiosis ?
I. Meiosis is a double division . It gives rise to four cells .
II . The cells undergoing meiosis may be haploid or diploid .
III . No bouquet stage is recorded .
IV . Pairing or synapsis of homologous chromosomes takes place during zygotene of prophase - I and continues upto metaphase - I .
( a ) I only
( b ) I and IV
( c ) II and III
( d ) All of these
29. If a tissue has at a given time 1024 cells , how many cycles of mitosis had the original parental single cell undergone ?
( a ) 10
( b ) 15
( c ) 20
( d ) 24
30. A cell undergoing meiosis produces four daughter cells , two of which are aneuploids , while two are haploid . This can occur due to
( a ) non - disjunction during first meiotic division only
( b ) non - disjunction during second meiotic division only
( c ) non - disjunction during either first or second meiotic divisions .
( d ) non - disjunction during both first and second meiotic divisions
31. Match the graphs ( P - S ) showing quantitative change in DNA content at each of four stages in the cell cycle ( G₁ , S , G₂ , M ) with the given statements regarding cell activity and response .
I. Taxol treatment , which prevents microtubule depolymerisation , arrests the cell at this stage .
II . With a mitogen treatment , such as an growth factor , an arrested cell at this proceeds to the next stage of the cell cycle .
III . The cell cycle check point at this stage confirms that DNA duplication is complete before the cell proceeds to the next stage .
( a ) I - P , II - Q , III - R
( b ) I - Q , II - S , III - R
( c ) I - R , II - Q , III - S
( d ) I - P , II - S , III - Q
32. In which stage of the first meiotic division two sister chromatids are formed ?
( a ) leptotene
( b ) zygotene
( c ) pachytene
( d ) diplotene
33. Given below are some processes which involve mitosis or meiosis . Categorise them and select the correct option .
1. Variations
2. Maintenance of chromosome number
3. Formation of gametes
4. Evidence of basic relationship among organisms
5. Growth and repair
6. Cancer
Mitosis Meiosis
( a ) 1 and 2 3 , 4 , 5 and 6
( b ) 2 , 4 , 5 and 6 1 and 3
( c ) 4 and 5 1,2, 3 and 6
( d ) 1, 2 and 6 3,4 and 5
34. The given figure is a schematic break - up of the phases / stages of cell cycle . Select the correct option regarding it .
( b ) zygotene
( c ) pachytene
( d ) diplotene
33. Given below are some processes which involve mitosis or meiosis . Categorise them and select the correct option .
1. Variations
2. Maintenance of chromosome number
3. Formation of gametes
4. Evidence of basic relationship among organisms
5. Growth and repair
6. Cancer
Mitosis Meiosis
( a ) 1 and 2 3 , 4 , 5 and 6
( b ) 2 , 4 , 5 and 6 1 and 3
( c ) 4 and 5 1,2, 3 and 6
( d ) 1, 2 and 6 3,4 and 5
34. The given figure is a schematic break - up of the phases / stages of cell cycle . Select the correct option regarding it .
( a ) ' a ' represents karyokinesis which is the division of cytoplasm .
( b ) ' b ' is telophase which is just reverse of prophase .
( c ) ' c ' is the best phase to count total number of chromosomes in any species . ( d ) In ' d ' stage , replication of DNA takes place on the template of the existing DNA .
35. Decision of G0 phase occurs
( a ) towards the end of G₁ - phase
( b ) towards middle of G₁ - phase
( c ) at the end of telophase
( d ) towards end of cytokinesis
36. In animal cytokinesis , cleavage occurs with the help of
( a ) microtubules
( b ) spindle fibres
( c ) microfibrils
( d ) microfilaments .
37. Synaptonemal complex is found associated with
( a ) paired meiotic chromosomes
( b ) lampbrush chromosomes
( c ) polytene chromosomes
( d ) mitotic chromosomes .
38. Segregation of Mendelian factor ( Aa ) occurs during
( a ) diplotene
( b ) anaphase - I
( c ) zygotene / pachytene
( d ) anaphase - II .
39. In meiosis , the daughter cells differ from parent cell as well as amongst themselves due to
( a ) segregation , independent assortment and crossing over
( b ) segregation and crossing over only
( c ) independent assortment and crossing over only
( d ) segregation and independent assortment only .
40. When paternal and maternal chromosomes change their genetic materials with each other in cell division this event is called
( a ) bivalent - forming
( b ) dyad - forming
( c ) synapsis
( d ) crossing - over .
41. If you are provided with root - tips of onion in your class and are asked to count the chromosomes , which of the following stages can you most conveniently look into ?
( a ) Metaphase
( b ) Telophase
( c ) Anaphase
( d ) Prophase
42. When synapsis is complete all along the chromosome , the cell enters a stage called
( a ) zygotene
( b ) pachytene
( c ) diplotene
( d ) diakinesis .
43. Centromeres separate at which stage of meiosis ?
( a ) Anaphase - I
( b ) Anaphase - II
( c ) Metaphase - I
( d ) Prophase - I
44. Duplication of DNA occurs during which stage of the cell cycle ?
( a ) Interphase
( b ) Early prophase
( c ) Late prophase
( d ) Late telophase
45. In meiosis there occurs normally
( a ) many divisions
( b ) two divisions of nucleus and two divisions of cytoplasm
( c ) one division of nucleus and one division of cytoplasm
( d ) two divisions of nucleus and one division of cytoplasm .
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Ans key
1. C, 2.B, 3.C, 4.A, 5.D, 6.A, 7.C, 8.D, 9.B, 10.C, 11.A, 12.B, 13.D, 14.C, 15.D, 16.A, 17.B, 18.C, 19.C, 20.A, 21.B, 22.D, 23.B, 24.B, 25.C, 26.D, 27.C, 28.B, 29.A, 30.A, 31.A, 32.C, 33.B, 34.D, 35.B, 36.D, 37.A, 38.B, 39.A, 40.D, 41.A, 42.B 43.B, 44.A, 45.D
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