CBSE Questions for Class 11 Medical Biology Cell Cycle And Cell Division Quiz 3 - MCQExams.com

The significance of meiosis lies in
  • Reduction of the diploid number of chromosomes to haploid
  • Maintaining constancy in the number of diploid chromosomes during sexual reproduction
  • Production of genetic variability in the population of a species
  • All of the above
In which stage of cell division chromosomes are most condensed?
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
Karyokinesis differ from cytokinesis because it involves
  • Division of cytoplasm
  • Division of the nucleus and cytoplasm
  • Division of the nucleus
  • Division of the cell
Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle?
  • Formation of the contractile ring and formation of the phragmoplast
  • Formation of the contractile ring and transcription from chromosomes
  • Decondensation of chromosomes and reassembly of the nuclear lamina
  • Transcription from chromosomes and ressembly of the nuclear lamina
 Which of the following phase during mitosis, ER and nucleolus begin to disappear?
  • Early prophase
  • Late prophase
  • Early metaphase
  • Late metaphase
During cell division, chromosome attaches with spindles to
  • Kinetochore
  • Centrosome
  • Centriole
  • Secondary constriction
Which stages of cell division do the following figures A and B represent respectively?
54500_af489d3cba0841a28a90fa06fdd7db0d.png
  • Prophase and anaphase
  • Metaphase and telophase
  • Telophase and metaphase
  • Late anaphase and prophase
Which is not true for anaphase?
  • Golgi body and endoplasmic reticulum are reformed
  • Chromosomes move to opposite poles
  • Spindle poles move farther apart
  • Centromeres split and chromatids separate
How many mitotic divisions are needed for a single cell to make 128 cells?
  • 7
  • 14
  • 28
  • 32
The nuclear membrane disappears in
  • Metaphase
  • Early prophase
  • Late prophase
  • Anaphase
At metaphase, chromosomes are attached to the spindle fibres by their
  • Kinetochores
  • Centromere
  • Satellites
  • Secondary constrictions
In an organism, if the normal diploid number of chromosomes is 8, how many chromatids are present in each daughter cell at the end of meiosis I?
  • 2
  • 4
  • 8
  • 16
A human T lymphocyte in the mitotic metaphase stage will contain how many DNA molecules (exclude the DNA of mitochondria)?
  • 23
  • 46
  • 184
  • 92
Select the correct option with respect to mitosis.
  • Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
  • Chromatids separate but remain in the centre of the cell in anaphase
  • Chromatids start moving towards opposite poles in telophase
  • Golgi complex and endoplasmic reticulum are still visible at the end of prophase
Chromosomes in metaphase get arranged at the equatorial plate (see Fig. 1). When these cells are treated with colchicine, cell division is arrested and the cells never enter anaphase. If we were to compare a colchicine treated cell at metaphase and an untreated cell in the same phase, we notice that chromosomes are more dispersed and do not arrange themselves on the equatorial plate in the treated cells (see Fig 2.).
Using this information, which of the following will be affected by colchicine?
80197_a9bbb870f0544e1db5a5bffc178ceaa4.png
  • Centromere
  • Spindle fiber
  • Centriole
  • Arms of chromosomes
Which of the following statements is true?
  • A diploid cell produces four diploid cells in meiosis.
  • The chromosomes number is reduced to half in daughter cells in mitosis.
  • The chromosome number remains the same like parent cell in meiosis.
  • None of the above.
The gametes are formed in most of the multicellular organisms by a process of cell division called as
  • Mitosis
  • Replication
  • Meiosis
  • Prophage
Which of the following statement is true?
  • The daugbter cell receives two maternal and one paternal chromosomes.
  • The daughter cell receives both maternal and paternal chromosomes of the homologous pair.
  • The daughter cells receives only maternal or paternal chromosomes of the non homologous pair.
  • None of the above.
Assertion : Primary spermatocytes are formed by meiosis-I in the spermatogonia.

Reason : Primary spermatocytes are formed by meiosis-I in the spermatogonia.
  • Both Assertion and Reason are true and Reason is a correct explanation of Assertion
  • Both Assertion and Reason are true but Reason is not a correct explanation of Assertion
  • Assertion is true but Reason is false
  • Both Assertion and Reason are false
  • Assertion is false but reason is true.
56 cells are produced in meiosis in which ........
  • First division is reductional.
  • First division is equational.
  • Second division is reductional.
  • None of the above.
A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.
69892_ee5968daeffa479385746d343a032479.png
  • Telophase - nuclear envelop reforms, golgi complex reforms
  • Late anaphase - chromosomes move away from equatorial plate, golgi complex not present
  • Cytokinesis - cell plate formed, mitochondria distributed between two daughter cells
  • Telophase - endoplasmic reticulumand nucleolus not reformed yet
In the anaphase of mitosis,
  • Chromosomes are in the middle of the cell
  • Chromosomes are at one pole
  • Chromosomes moves away towards the poles from middle
  • There are no chromosomes
'U' or 'V' or 'J' shaped chromosomes are seen in ............ the phase of cell division.
  • Prophase
  • Metaphase
  • Telophase
  • Anaphase
Which of the following is true? 
  • Meiosis maintains constant number of chromosomes in an organism.
  • Meiosis provides opportunity for the exchange of genes.
  • Meiosis causes genetic variations among the species.
  • All of the above.
Which of the following is true for mitosis?
  • No chiasma formation
  • No crossing over
  • Prophase has no substage
  • All of the above
Cytokinesis is
  • Division of nuclei
  • Division of chromosomes
  • Division of cytoplasm
  • Completion of cell division
Which of the following is a type of coiling found during mitosis?
  • Plectonemic
  • Paranemic
  • Both A and B
  • None of the above
A stage in cell division is shown in the figure. Identify the stage of cell division with its characteristics.
160589.png
  • Late anaphase - Chromosomes move away from equatorial plate, golgi complex not present
  • Cytokinesis - Cell plate formed mitochondria distributed between two daughter cells
  • Telophase - Endoplasmic reticulum and nucleolus not reformed yet
  • Telophase - Nuclear envelope reforms, golgi complex reforms
The correct statement for significance of mitosis is 
  • Equal distribution of chromosomes
  • Restoration of surface-volume ratio
  • Maintenance of nucleoplasmic index
  • All of the above
In which of the following ways mitosis and meiosis are similar? 
  • Both are preceded by the replication of DNA
  • Both occur in all kinds of cells
  • Both include the separation of the chromosome
  • Both A and C
Necessity of meiosis II is
  • To reduce the number of chromosomes.
  • To induce haploidy of DNA.
  • To increase number of cells.
  • None of the above.
Which of the following event occurs in meiosis?
  • Meiosis II reduces the chromosome number from diploid to haploid.
  • DNA replicates between meiosis I and II.
  • The exchange of genetic material takes place during meiosis I between non-sister chromatids of two homologous chromosomes. 
  • Homologous chromosomes separate from one another in telophase I.
The larger chromosomes get arranged, in which region of the metaphase plate?
  • Peripheral region
  • Variable from plant to plant
  • Central region
  • Not constant
Identify the incorrect statement regarding meiosis.
  • No duplication of centromeres occur in meiosis I
  • Chromosomes do not duplicate in meiosis II
  • Both A and B
  • None of the above
Tetrads are formed, during .......... phase of meiosis.
  • Anaphase I
  • Prophase II
  • Prophase I
  • Anaphase II
In meiosis,
  • A single nucleus gives rise to two identical daughter nuclei
  • The daughter nuclei are genetically identical to the parent nucleus
  • The centromeres separate at the onset of anaphase I
  • Homologous chromosomes synapse in prophase I
Meiosis is also called as haplosis as
  • Meiosis occurs in haploid cell
  • Meiosis nullify the effect of fertilization
  • Meiosis reduce the number of chromosome to half
  • None of the above
............. is present between meiosis I and meiosis II.
  • Interphse
  • Prophase II
  • Interkinesis
  • Telophase II
Cells that can divide by meiosis is
  • Sporocyte
  • Meiocytes
  • Primary spermatocyte and primary oocytes
  • All of the above
In total how many substages the prophase I of the meiotic division has?
  • Two
  • Three
  • Five
  • Six
Which among the following is the correct order of phases in prophase I?
  • Leptotene, diakinesis, pachytene, diplotene, zyotene
  • Leptotene, zygotene, pachytene, diplotene, diakinesis
  • Diakinesis, diplotene, pachytene, zygotene, leptotene
  • Leptotene, pachytene, zygotene, diplotene, diakinesis
A drug called colchicine interferes in mitosis during the spindle microtubule formation; it does so by
  • Arresting chromosome movement
  • Breaking microtubules
  • Thickening microtubles
  • Arresting centriole movement
Crossing over of chromosomes during meiosis leads to
  • Mutation
  • Sex determination
  • New gene combination
  • Loss of chromosomes
Which among the following are cytogenetic events which occur during prophase I?
  • Synapsis
  • Crossing over
  • Chiasma formation
  • All of the above
How many cells and meiosis are required to produce 200 cells?
  • 25, 25
  • 50, 25
  • 50, 50
  • 50, 125
If root cell has 42 chromosomes then the number of chromosome in egg is
  • 42
  • 21
  • 7
  • 63
Fill in the blanks.
The exchange of chromosome segments between maternal and paternal chromatids during meiosis I is called _______.
  • Linkage
  • Diakinesis
  • Crossing over
  • Dominant
In animal cells, cytokinesis involves _______.
  • Separation of sister chromatids
  • Contraction of ring of microfilaments
  • Depolymerisation of kinetochore microtubules
  • Protein kinase that phosphorylates other enzymes
First meiosis occurs in
  • Secondary prermatocyte
  • Primary spermatocyte
  • Spermatids
  • Spermatogonia
In cell cycle, the mRNA needed for protein synthesis occurs in which of the following?
  • Synthetic period
  • Post mitotic gap period
  • Premitotic gap period
  • Prophase
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