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NEET Biology MCQ
Neet Biology Cell Cycle, Cell Division Mcq
Quiz 10
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Q.1
When synapsis is complete all along the chromosome, the cell is said to have a stage called
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a) diplotene
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b) diakinesis
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c) zygotene
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d) pachytene
Explanation
Answer:(d)
Q.2
What is the correct sequence of the steps given here? Also work out the process depicted in the steps I) Homologous chromosomes move toward opposite poles of the cell; chromatids do not separate II) Chromosomes gather to gather at the two poles of the cell and the nuclear membranes form III) Homologous chromosomes pair and exchange segments IV) Homologous chromosomes align on a central plate V) The haploid cells separate completely
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a) The correct sequence is III →IV → I →II→V and the process is meiosis I
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b) The correct sequence is II →I → V →IV →II and the process is mitosis
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c) The correct sequence is IV →I → III →II→V and the process is meiosis I
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d) The correct sequence is II →V → IV →I →II and the process is mitosis
Explanation
Answer:(a)
Q.3
Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain attached to the centromeres.
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a) Anaphase I.
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b) Metaphase I.
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c) Anaphase II.
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d) Metaphase II.
Explanation
Answer:(a)
Q.4
Which of the following ions are necessary for assembly of microtubules?
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a) Na+ and Ca2+
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b) Na+ and K+
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c) Ca+ and Mg2+
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d) Ca2+and Cl-
Explanation
Answer:(c)
Q.5
Prophase is marked by:
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a) Initiation of condensation of chromosomal materials.
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b) Alignment of chromosome at equatorial plate.
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c) Completion of assembly of mitotic spindle.
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d) Complete disintegration of nuclear envelope.
Explanation
Answer:(a)
Q.6
In a dipole cell, at which stage of cell cycle, the amount of DNA is doubled
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a) G0
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b) S phase
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c) S, G2 and M phase
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d) G1 and G2
Explanation
Answer:(b)
Q.7
Find correct match:
Column I
Column II
Spireme stage.
a) Diplotene
Antephase
b) Prophase
Congression
c) Post mitotic phase.
Chiasmata counting
d) Metaphase stage
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a) 1 - b ; 2 - c ; 3 - a ; 4 - d
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b) 1 - b ; 2 - d ; 3 - c ; 4 - a
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c) 1 - b ; 2 - c ; 3 - d ; 4 - a
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d) 1 - c ; 2 - b ; 3 - d ; 4 - a
Explanation
Answer:(c)
Q.8
Meiosis I :
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a) is sometimes followed by interphase
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b) is followed by a period of interkinesis
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c) is not followed by any period of rest
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d) is always followed by interphase
Explanation
Answer:(b)
Q.9
Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?
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a) Transduction.
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b) Genetic drift.
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c) Chromosomal aberration.
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d) Recombination.
Explanation
Answer:(d)
Q.10
The beginning of diplotene is recognized by
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a) Crossing over
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b) Dissolution of synaptonemal complex
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c) Appearance of chiasmata
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d) Appearance of recombination nodules
Explanation
Answer:(b)
Q.11
Given below is a schematic break-up of the phases/stages of cell cycle Which one of the following is the correct indication of the stage/phase in the cycle
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a) A-Cytokinesis
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b) B-Metaphase
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c) C – Karyokinesis
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d) D – Synthetic pahse
Explanation
Answer:(d)
Q.12
Microtubule depolymerizing drug such as colchicine is expected to
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a) allow mitosis beyond metaphase
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b) induce formation of multiple contractile rings
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c) inhibit spindle formation during mitosis
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d) inhibit cytokinesis
Explanation
Answer:(c)
Q.13
The key features of meiosis are given below. Identify the incorrect statement:
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a) Diplotene stage is characterised by X shaped structure called bouquet.
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b) Meiosis involves two sequential cycles of nuclear and cell division called Meiosis I and Meiosis II but only a single cycle of DNA replication.
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c) Pachytene stage is characterised by the appearance of recombination nodules.
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d) Zygotene stage is characterised by Synapsis, accompanied by the formation of synaptonemal complex.
Explanation
Answer:(a)
Q.14
Assertion (A) : Phase of cell division is also known as dividing phase. Reason (R) : In mitotic phase new cells are produced from pre-existing cells through meiosis division.
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a) Both A and R are true and R is the correct explanation of A.
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b) Both A and R are true but the R is not the correct explanation of A.
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c) A is true statement but R is false.
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d) Both A and R are false.
Explanation
Answer:(c)
Q.15
The time period between meiotic I and meiotic II cell division is called :
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a) interphase
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b) 1st gap
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c) interkinesis
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d) growth phase
Explanation
Answer:(c)
Q.16
he nuclear membrane disintegrates and spindle appears at :
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a) Late prophase
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b) Prometaphase
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c) Late telophase
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d) Early prophase
Explanation
Answer:(a)
Q.17
Meiosis – II is :
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a) Reduction division
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b) Commonly cell elongation
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c) Mitotic division
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d) Cell division
Explanation
Answer:(c)
Q.18
Statement – P : In ‘S’ stage centrosome is duplicated Statement – Q : In the prophase centrioles separate from each other and move towards the opposite poles.
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a) Statement P and Q both are correct
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b) Statement P is correct statement Q is wrong
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c) Statement P is wrong and statement Q is correct
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d) Statement P and Q both are wrong
Explanation
Answer:(c)
Q.19
In the given diagram “a” and “b”, which stage of mitosis is indicated
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a) a = Early prophase b = Anaphase
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b) a = Late prophase b = Anaphase
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c) a = Telophase b = Telophase
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d) a = Metaphase b = Telophase
Explanation
Answer:(b)
Q.20
During mitosis ER and nucleolus begin to disappear at
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a) early metaphase
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b) early prophase
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c) late prophase
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d) late metaphase
Explanation
Prophase is first stage of mitosis, marked by the initiation of condensation of chromosomal material, to form compact mitotic chromosomes. Mitotic spindle appears at the end of this phase , do not show golgi body, ER, nucleus. early prophase - the nuclear membrane becomes more and more indistinct and the chromatin fibers become more and more packaged and condensed. It is usually not possible to follow individual threads, but the condensation of the material into individual units is becoming obvious. The nucleolus also becomes indistinct and begins to vanish. mid-prophase - the chromatin threads are now condensed enough to be distinguished as individual chromosomes. Each chromosome consists of two identical halves called chromatids, that are connected and held together by a constriction called a centromere. The location of the centromere along the length of the chromosome and chromatids is a distinctive characteristic of many chromosomes, and can sometimes be used (with other factors) to identify them. The pairs of centrioles continue to move around the almost vanished nucleus to opposite sides of the cell. late prophase - the nuclear membrane and the nucleolus finally vanishes completely. The chromosomes are very distinct, easy to recognize and have clear "arms" composed of the two parts of the sister chromatids. The centrioles, and asters, are at opposite ends of the cell and the thin protein spindle fibers are reaching out and attaching to the centromeres of each chromosome from opposite directions. Answer:(b)
Q.21
Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division
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a) A – Chromonema,, B – Chromatin C –Metaphase
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b) A- Chromonema B – Chromatid C – Anaphase
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c) A – Chromatin , B – Chromatid C – Metaphase
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d) A- Chromonema B – Chromosome C – Anaphase
Explanation
Answer:(a)
Q.22
Assertion: In meiosis, one haploid cell produces two diploid cells. Reason: The daughter cell in meiosis receives maternal and paternal chromosomes of homologous pairs.
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
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c) Assertion is true but Reason is false.
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d) Both Assertion and Reason are false.
Explanation
Answer:(d)
Q.23
Which of the following statements is incorrect about G0 phase
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a) Cell volume keeps on increasing during this phase
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b) Mitosis occurs after G0 phase
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c) Cell metabolism occurs continuously in G0 phase
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d) Biocatalysts can be used to exit G0 phase
Explanation
Answer:(b)
Q.24
At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell:
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d) During the G1 phase.
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a) During the entire prophase.
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b) During G2 phase.
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c) During the S phase.
Explanation
Answer:(c)
Q.25
Calcium dependent kinases can control
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a) Cell surface receptors
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b) membrane structure
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c) DNA replication
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d) Cell cycle activities
Explanation
Answer:(d)
Q.26
Colchicine prevents the mitosis of cell at:
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a) Telophase stage.
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b) Prophase stage.
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c) Metaphase stage.
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d) Anaphase stage.
Explanation
Answer:(c)
Q.27
Identify the correct matched pair
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a) Exchange of genetic material – Diakinesis
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b) Anaphase II of meiosis – Centromeric division
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c) Segregation – Metaphase II
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d) Significance of meiosis – Production of genetically similar cells
Explanation
Answer:(b)
Q.28
Repulsion of homologous chromosomes takes place in:
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a) Pachytene.
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b) Zygotene.
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c) Leptotene.
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d) Diakinesis.
Explanation
Answer:(a)
Q.29
How many chromatids will be there in a cell having 12 chromosomes when it passes through mitotic metaphase and metaphase II?
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a) 12 and 12.
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b) 12 and 24.
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c) 24 and 12.
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d) 24 and 24.
Explanation
Answer:(c)
Q.30
The significance of meiosis lies in:
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a) Production of genetic variability in the population of species.
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b) Reduction of diploid number of chromosomes into haploid.
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c) Maintaining constancy in the number of chromosomes in an organism.
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d) All of the above.
Explanation
Answer:(a)
0 h : 0 m : 1 s
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