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Biology
Cell Cycle and Cell Division
87 questions from 33 papers, each with its answer.
- 87 questions
- 33 papers
- 2.47% of Biology
Cell Cycle – Phases of Interphase
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Among eukaryotes, replication of DNA takes place in
DNA replication occurs in the S (synthesis) phase.
In eukaryotes, S or Synthesis phase marks the period during which DNA synthesis or replication takes place. During this phase the amount of DNA per cell doubles.
Meiosis – Stages
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Which of the following stages of meiosis involves division of centromere?
Centromeres split and chromatids separate in anaphase.
Anaphase stage is characterised by the following key events: 1. Centromeres split and chromatids separate. 2. Chromatids move to opposite poles.
Meiosis – Prophase I Sub-stages
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The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
Recombination nodules appear in pachytene, where crossing over occurs.
The first two stages of prophase I are relatively short-lived compared to the next stage that is pachytene. During this stage the four chromatids of each bivalent chromosomes become distinct and clearly appear as tetrads. This stage is characterised by the appearance of recombination nodules, the site at which crossing over occurs between non-sister chromatids of the homologous chromosomes.
Cell Cycle – Phases
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Match List-I with List-II
Pick the matching item from Column II for each row.
Column I
- A. M Phase
- B. $G_2$ Phase
- C. Quiescent stage
- D. $G_1$ Phase
Column II
- I. Proteins are synthesized
- II. Inactive phase
- III. Interval between mitosis and initiation of DNA replication
- IV. Equational division
Correct answer: A → IV, B → I, C → II, D → III
M phase is equational division and G1 is the interval between mitosis and DNA replication.
M phase is the most dramatic period of cell cycle, also called equational division. $G_2$ phase: Proteins are synthesized in preparation for mitosis. Quiescent stage: cells do not divide further, exit $G_1$ phase to enter an inactive state. $G_1$ phase: This phase corresponds to the interval between mitosis and initiation of DNA replication.
Cell Cycle – Interphase and Quiescent Stage
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Given below are two statements: Statement I: During $G_0$ phase of cell cycle the cell is metabolically inactive Statement II: The centrosome undergoes duplication during S phase of interphase. In the light of the above statements, choose the most appropriate answer from the option below:
Cells in G0 remain metabolically active; the centrosome duplicates in S phase.
The cells that do not divide further exit $G_1$ phase to enter an inactive stage called quiescent stage ($G_0$) of the cell cycle. Cells in this stage remain metabolically active but no longer proliferate unless called on to do so depending on the requirement of organism.
Meiosis and Mitosis – Stages
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Select the correct statements. A. Tetrad formation is seen during leptotene B. During Anaphase, the centromere split and chromatids separate. C. Terminalization takes place during Pachytene. D. Nucleolus, Golgi complex and ER are reformed during Telophase. E. Crossing over takes place between sister chromatids of homologous chromosomes Choose the correct answer from the option given below:
Tetrads form in zygotene, terminalisation occurs in diakinesis, and crossing over is between non-sister chromatids.
Tetrad formation is seen during zygotene. The final stage of meiotic prophase I is diakinesis. This is marked by terminalisation of chiasmata. Crossing over occurs between non-sister chromatids of the homologous chromosomes.
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