CBSE Class 11 Biology Cell Cycle and Cell Division MCQs Set 03

Question: Which of the following is not a characteristic feature during mitosis in somatic cells?
a) Chromosome movement
b) Synapsis
c) Spindle fibres
d) Disappearance of nucleolus
Answer: b

Question: During the metaphase stage of mitosis, spindle fibres attach to chromosomes at
a) kinetochore
b) both centromere and kinetochore
c) centromere, kinetochore and areas adjoining centromere
d) centromere.
Answer: a

Question: Crossing over takes place between which chromatids and in which stage of the cell cycle ?
a) Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I.
b) Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I.
c) Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I.
d) Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I.
Answer: b

Question: Cells in G0 phase
a) terminate the cell cycle
b) exit the cell cycle
c) enter the cell cycle
d) suspend the cell cycle.
Answer: b

Question: Which typical stage is known for DNA replication?
a) S-phase
b) G2-phase
c) metaphase
d) G1-phase
Answer: a

Question: During cell growth, DNA synthesis takes place on
a) S-phase
b) G1-phase
c) G2-phase
d) M phase.
Answer: a

Question: A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has
a) twice the number of chromosomes and four times the amount of DNA
b) four times the number of chromosomes and twice the amount of DNA
c) twice the number of chromosomes and twice the amount of DNA
d) same number of chromosomes but twice the amount of DNA.
Answer: a

Question: At metaphase, chromosomes are attached to the spindle fibres by their
a) satellites
b) secondary constrictions
c) kinetochores
d) centromeres.
Answer: c

Question: When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?
a) M
b) Both G2/M and M
c) G1 /S
d) G2/M
Answer: d

Question: At what stage of the cell cycle are histone proteins
synthesized in a eukaryotic cell?
a) During G2 stage of prophase
b) During S-phase
c) During entire prophase
d) During telophase
Answer: b

Question: Spindle fibres attach on to
a) centromere of the chromosome
b) kinetosome of the chromosome
c) telomere of the chromosome
d) kinetochore of the chromosome.
Answer: d

Question: During mitosis, ER and nucleolus begin to disappear at
a) late prophase
b) early metaphase
c) late metaphase
d) early prophase.
Answer: d

Question: Spindle fibres attach on to :-
a) Telomere of the chromosome
b) Kinetochore of the chromosome
c) Centromere of the chromosome
d) Kinetosome of the chromosome
Answer: b

Question: In the somatic cell cycle
a) in G1 phase DNA content is double the amount of DNA present in the original cell
b) DNA replication takes place in S phase
c) a short interphase is followed by a long mitotic phase
d) G2 phase follows mitotic phase.
Answer: b

Question: When synapsis is complete all along the chromosome, the cell is said to have entered a stage called
a) zygotene
b) pachytene
c) diplotene
d) diakinesis
Answer: b

Question: During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?
a) G0 and G1
b) G1 and S
c) Only G2
d) G2 and M
Answer: c

Question: Dissolution of the synaptonemal complex occurs during
a) pachytene
b) zygotene
c) diplotene
d) leptotene.
Answer: c

Question: Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres :-
a) Anaphase I
b) Anaphase II
c) Metaphase I
d) Metaphase II
Answer: a

Question: Which of the following is not correctly matches a phase of the cell cycle with its function ?
a) Second gap phase - Period of cytoplasmic growth
b) First gap phase - Most of the organelle duplication
c) Interphase - Phase of preparation for cell division
d) DNA synthesis - Doubling of number of phase chromosome in cell
Answer: d

Question: Mitotic anaphase differs from metaphase in possessing
a) same number of chromosomes and same number of chromatids
b) half number of chromosomes and half number of chromatids
c) half number of chromosomes and same number of chromatids
d) same number of chromosomes and half number of chromatids.
Answer: d

Question: In ‘S’ phase of the cell cycle
a) amount of DNA doubles in each cell
b) amount of DNA remains same in each cell
c) chromosome number is increased
d) amount of DNA is reduced to half in each cell.
Answer: a

Question: In a somatic cell cycle, DNA synthesis takes place in
a) G1 phase
b) prophase of mitosis
c) S-phase
d) G2 phase.
Answer: c

Question: Select the correct option with respect to mitosis.
a) Chromatids separate but remain in the centre of the cell in anaphase.
b) Chromatids start moving towards opposite poles in telophase.
c) Golgi complex and endoplasmic reticulum are still visible at the end of prophase.
d) Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase.
Answer: d

Question: If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?
a) Metaphase
b) Telophase
c) Anaphase
d) Prophase
Answer: a

Question: In which phase of cell cycle the amount of DNA in a diploid cell become four times as compared to a haploid cell ?
a) G1
b) S
c) G2, S & M
d) G0
Answer: b

Question: The stage during which separation of the paired homologous chromosomes begins is
a) pachytene
b) diplotene
c) diakinesis
d) zygotene.
Answer: b

Question: Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle?
a) Decondensation from chromosomes and reassembly of the nuclear lamina
b) Transcription from chromosomes and reassembly of the nuclear lamina
c) Formation of the contractile ring and formation of the phragmoplast
d) Formation of the contractile ring and transcription from chromosomes
Answer: c

Question: During gamete formation, the enzyme recombinase participates during :-
a) Prophase-I
b) Prophase-II
c) Metaphase-I
d) Anaphase-II
Answer: a

Question: Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of
a) M phase
b) G1 phase
c) S phase
d) G2 phase.
Answer: b