Which of the following options gives the correct sequences of events during mitosis?
(1) Condensation → nuclear membrane disassembly → crossing over → Segregation → telophase
(2) Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → Segregation → telophase
(3) Condensation → crossing over → nuclear membrane disassembly → Segregation → telophase
(4) Condensation → arrangement at equator → centromere division → Segregation → telophase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDuring cell growth, DNA synthesis takes place in
(1) S-phase
(2) -phase
(3) -phase
(4) M-phase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen cell has stalled DNA replication fork, which checkpoint should be predominantly activated?
(1) G1/s
(2) G2/M
(3) M
(4) Both G2/M and M
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch the stage of meiosis in column I to their characteristic features in column II and select the correct option using the codes given below
Column l Column ll
A. pachytene 1. pairing of homologous chromosomes
B. Metaphase-l 2. Terminalisation of chiasmata
C. Diakinesis 3. Crossing-over takes place
D. Zygotene 4. Chromosomes align at equatorial plate
The correct option:
A B C D
(1) 3 4 2 1
(2) 1 4 2 3
(3) 2 4 3 1
(4) 4 3 2 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that his cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in
(1) polyploidy
(2) somaclonal variation
(3) polyteny
(4) aneuploidy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is not a characteristic feature during mitosis in somatic cells
(1) Disappearance of nucleolus
(2) Chromosome movement
(3) Synapsis
(4) Spindle fibres
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySpindle fibres attach on to
(1) Kinetochore of the chromosome
(2) centromere of the chromosome
(3) Kinetosome of the chromosome
(4) telomere of the chormosome
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn meiosis crossing over is initiated at
1. leptotene
2. Zygotene
3. diplotene
4. pachytene
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDNA replication in bacteria occurs
(1) during S-phase
(2) within nucleolus
(3) prior to fission
(4) just before transcription
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAnaphase 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?
(1) Chromosomes will not condense
(2) Chromosomes will be fragmented
(3) Chomosomes will not segregate
(4) Recombinantion of chromosome arms will occur
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology