The centrioles replicate during:
1. G1 phase
2. S phase
3. G2 phase
4. Early prophase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyBivalent chromosomes clearly appear as tetrads during:
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe beginning of diplotene is recognized by :
1. appearance of recombination nodules
2. Crossing over
3. Dissolution of synaptonemal complex
4. Appearance of chiasmata
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider the given two statements:
l. During G1 phase the cell is metabolically active and continuously grows but does not replicate its DNA.
ll. During G2 phase, proteins are synthesized in preparation for mitosis while cell growth continues.
Of the two statements:
1. Only l is correct
2. Only ll is correct
3. Both l and ll are correct
4. Both l and ll are incorrect
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?
1. C
2. 2C
3. 3C
4. 4C
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn oocyte of some vertebrates, the stage of meiosis I that can last for months or years would be:
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen a cell stops growing, say due to shortage of nutrients, this will occur in which phase of the cell cycle?
1.
2.
3. S
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe following cell undergoing mitosis, is at :
1. Early prophase
2. Late prophase
3. Transition to metaphase
4. Early metaphase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich 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 & Biology