Let a cell's generation time is 1 minute. In 20 minutes a culture tube (culture medium) is 1/8th filled with cells. When the tube will be fullfilled?
(1) 21 minutes
(2) 23 minutes
(3) 60 minutes
(4) 160 minutes
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe following diagram refers to a typical cell cycle.
Identify the parts marked as X, Y and Z.
1. X - G1; Y - S; Z - G2 2. X - G2; Y - S; Z - G1
3. X - G0; Y - S; Z - G2 4. X - G1; Y - G2; Z - G0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:
(1) Metaphase I
(2) Metaphase II
(3) Anaphase I
(4) Anaphase II
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAt which stage of meiosis does the genetic constitution of gametes is finally decided:
(1) Metaphase I
(2) Anaphase II
(3) Metaphase II
(4) Anaphase I
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the correct statement about G1 phase:
(1) Cell is metabolically inactive
(2) DNA in the cell does not replicate
(3) It is not a phase of synthesis of macromolecules
(4) Cell stops growing
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA. Most dramatic period of cell cycle involving a major reorganization of virtually all components of the cell
B. It represents the phase when the actual cell division occurs
These statements (A & B) are concerned with
1. S-phase
2. G1 phase
3. M-phase
4. G2 phase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the correct statement
(1) Chromosomes decondense and lose their individuality during anaphase
(2) Spindle fibres attach to kinetochores of chromosomes during early prophase
(3) Centriole begins to move towards opposite poles of the cell during metaphase
(4) DNA is replicated during S-phase of cell cycle
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyInterkinesis stage of cell cycle
(1) Is generally short lived
(2) Shows DNA duplication
(3) Is generally long lived
(4) Is followed by prophase-I
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the incorrect statement
(1) Yeast can progress through the cell cycle in about 90 minutes
(2) DNA synthesis is a continuous process in cell cycle
(3) Duration of I-phase in the cell cycle is more than 95%
(4) Events of cell cycle are under genetic control
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCells that do not divide further exit G1 phase to enter an inactive stage called
(1) G2 phase
(2) G0 stage
(3) S-phase
(4) M-phase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology