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Q. No.During the metaphase stage of mitosis spindle fibres attach to chromosomes at:
1.
kinetochore
2.
both centromere and kinetochore
3.
centromere, kinetochore and areas adjoining centromere
4.
centromere
Subtopic: Cell Division: Mitosis (Karyokinesis) |
89%
From NCERT
NEET - 2013
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A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics?
| 1. | Metaphase-spindle fibers attached to kinetochores, centromeres split and chromatids separate |
| 2. | Metaphase- chromosomes moved to spindle equator chromosomes made up of two sister chromatids |
| 3. | Anaphase - centromeres split and chromatids separate and start moving away |
| 4. | Late prophase - chromosomes move to spindle equator |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
76%
From NCERT
NEET - 2013
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What will be correct regarding metaphase of mitosis?
I. The complete disintegration of the nuclear envelope marks the start of metaphase.
II. Condensation of chromosomes is completed.
III. All the chromosomes come to lie at the equator.
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
I. The complete disintegration of the nuclear envelope marks the start of metaphase.
II. Condensation of chromosomes is completed.
III. All the chromosomes come to lie at the equator.
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Cell Division: Mitosis (Karyokinesis) |
83%
From NCERT
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Identify the incorrectly matched pair:
| 1. | Prophase II: | The nuclear membrane disappears by the end of this stage and the chromosomes again become compact. |
| 2. | Metaphase II: | The chromosomes align at the equator and the microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids. |
| 3. | Anaphase II: | The homologous chromosomes separate, while sister chromatids remain associated at their centromeres. |
| 4. | Telophase II: | The two groups of chromosomes once again get enclosed by a nuclear envelope |
Subtopic: Cell Cycle: Meiosis II |
82%
From NCERT
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Assertion(A): Mitosis is called equational division.
Reason(R): The amount of DNA is the same in parent and progeny cells if it is mitosis.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): The amount of DNA is the same in parent and progeny cells if it is mitosis.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Cell Division: Mitosis (Karyokinesis) |
From NCERT
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Assertion(A): Meiosis reduces the chromosome number by half in gametes.
Reason(R): Meiosis is called the reductional division.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): Meiosis is called the reductional division.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
From NCERT
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Assertion(A): Cell growth disturbs the nuclear-cytoplasmic ratio.
Reason(R): The disturbance in the nucleo-cytoplasmic ratio stimulates cell division.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): The disturbance in the nucleo-cytoplasmic ratio stimulates cell division.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
From NCERT
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Assertion (A): In meiosis II division is equational.
Reason (R): Homologous chromosomes are separated in anaphase II
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Homologous chromosomes are separated in anaphase II
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Cell Cycle: Meiosis II |
61%
From NCERT
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The cell, undergoing cell division, as shown in the given figure, is at:
1. Early Prophase
2. Transition to Metaphase
3. Anaphase
4. Telophase
1. Early Prophase
2. Transition to Metaphase
3. Anaphase
4. Telophase
Subtopic: Cell Division: Mitosis (Karyokinesis) |
88%
From NCERT
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If a cell had 2N chromosomes and 2C DNA content in G1 phase, what would be the corresponding values at the end of the S phase?
1. 2N, 2C
2. 4N, 2C
3. 2N, 4C
4. 4N, 4C
1. 2N, 2C
2. 4N, 2C
3. 2N, 4C
4. 4N, 4C
Subtopic: Cell Division: Mitosis (Karyokinesis) |
88%
From NCERT
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