Cell Cycle and Cell Division
67 questions · Click an option and press Check Answer to reveal the result
Read the following statement carefully and identify the correct statement and select the correct option given below :-
(A) DNA replication occurs in nucleus in eukaryotes
(B) Gap 2 phase is also called post mitotic phase
(C) Crossing over in pachytene occurs due to chiasma formation
(D) All cells are arises from pre existing cell by cell division
From the statements given below, choose the incorrect option regarding the M-phase:
At Metaphase, all chromosomes come to lie at the equator.
In Anaphase, centromeres split and chromatids separate.
The plane of alignment of chromosomes at metaphase is referred to as the metaphase plate.
During Telophase, spindle fibers pull the chromosomes to the center of the cell.
Given below are the two statements : one is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A) : Meiosis is the mechanism by which conservation of specific chromosome number of each species is achieved across generation in sexualy reproducing organism, even though the process, per se, paradoxically, result in reduction of chromosome number by half.
Reason (R) : Meiosis involves pairing of homologous chromosomes and recombination between non sister chromatids of homologous chromosomes.
Both (A) and (R) are true and (R) is the not correct explanation of (A).
Match the following:
List–I List–II
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(1) Mitosis in plants (a) Inner cheek cells
(2) Meiosis in plants (b) Grasshopper testis
(3) Mitosis in animals (c) In plants
(4) Meiosis in animals (d) Onion root tip
(g) Young flower buds
Four different steps that occur during meiosis are given in the following list.
(i) Complete separation of chromatids
(ii) Pairing of homologous chromosomes
(iii) Lining up of paired chromosomes on equator
(iv) Crossing over between chromatids Select the correct sequential arrangement of the steps
Consider the following statements regarding the cell cycle:
A. The interphase lasts more than 95% of the duration of the cell cycle.
B. In the S phase, the chromosome number in a cell doubles.
C. The G2 phase corresponds to the interval between mitosis and initiation of DNA replication.
D. In the quiescent stage (G0), cells are metabolically inactive.
E. The M Phase starts with cytokinesis and ends with karyokinesis.
Choose the option with the correct statement(s).
Statement A : In animals, mitotic cell division usually occurs in the diploid somatic cells.
Statement B : The plants can show mitotic divisions in both haploid and diploid cells.
Mitosis is significant for
(a) Growth
(b) Healing and regeneration
(c) Repair
(d) Maintenance of cell size
Only (a) and (b)
Only (c) and (d)
Only (b) and (c)
All (a), (b), (c) and (d)
Identify the correct sequence of events that occur during the Prophase of mitosis:
A. Centrioles begin to move towards opposite poles.
B. Chromosomal material condenses to form compact mitotic chromosomes.
C. Spindle fibers attach to kinetochores of chromosomes.
D. Nucleolus, Golgi complexes, and Endoplasmic Reticulum disappear.
E. Chromatids separate and move toward opposite poles.
Choose the correct answer from the options given below:
A, B, and C only
B, C, and D only
A, B, and D only
A, C, and E only
Given below are the two statements : one is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A) : Some cells in the adult animals donot appear to exhibit division (eg. heart cells) and many other cells divide only occasionally, as needed to replace cells that have been lost because of injury or cell death. These cells that dont divide further exit G₁ phase to enter an inactive stage called quiescent stage (G₀) of the cell cycle.
Reason (R) : M-phase is the most dramatic period of the cell cycle, involving a major reorganization of virtually all components of cell.