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

Question : Chromosome duplication without nuclear division refers to

a) mitosis

b) endomitosis

c) meiosis

d) androgenesis

Answer : mitosis

Question : During which stages (or prophase I substages) of meiosis do you expect to find the bivalents and DNA replication respectively?

a) Zygotene and S phase (of interphase prior to prophase I)

b) Both

c) Pachytene and interphase (just prior to prophase I)

d) None of these

Answer : Zygotene and S phase (of interphase prior to prophase I)

Question : The two chromatids of a metaphase chromosome represent

a) replicated chromosomes to be separated at anaphase

b) homologous chromosomes of a diploid set

c) non-homologous chromosomes joined at the centromere

d) maternal and paternal chromosomes joined at the centromere

Answer : replicated chromosomes to be separated at anaphase

Question : Recombination of genes occur at

a) prophase I in meiosis

b) prophase II in meiosis

c) metaphase II in meiosis

d) prophase in mitosis

Answer : prophase I in meiosis

Question : Four daughter cells formed after meiosis are

a) genetically different

b) multinucleate

c) genetically similar

d) anucleate

Answer : genetically different

Question : In animal cells, cytokinesis involves

a) the contraction of the contractile ring of microfilament

b) depolymerisation of kinetochore microtubules

c) a protein kinase that phosphorylates other enzymes

d) the separation of sister chromatids

Answer : the contraction of the contractile ring of microfilament

Question : The number of chromatids in a chromosome at anaphase is

a) 1 in mitosis and 2 in meiosis

b) 2 each in mitosis and meiosis

c) 2 in mitosis and 4 in meiosis

d) 2 in mitosis and 1 in meiosis

Answer : 1 in mitosis and 2 in meiosis

Question : During cell division, sometimes there will be failure of separation of sister chromatids. This event is called

a) non-disjunction

b) coincidence

c) complementation

d) interference

Answer : non-disjunction

Question : In which stage of the cell cycle histone proteins synthesized in a eukaryotic cell?

a) During S-phase

b) During entire prophase

c) During telophase

d) During G₂ stage of prophase

Answer : During S-phase

Question : What is true about telophase stage?

a) All of these

b) Nuclear envelope, nucleolus, Golgi complex and ER reform

c) Chromosomes cluster at opposite spindle poles

d) Chromosomes lose their identity as discrete elements

Answer : All of these

Question :  The centromere is situated close to its ends and forming one extremely short and one very long arm in

a) Acrocentric chromosome

b) Telocentric chromosome

c) Sub-metacentric chromosome

d) Metacentric chromosome

Answer : Acrocentric chromosome

Question : The stage between two meiotic divisions is called interkinesis and

a) Is generally short lived and followed by prophase II

b) Involves duplication of genes and centrioles

c) Is followed by prophase I

d) Is long lived

Answer : Is generally short lived and followed by prophase II

Question : Which is correct w.r.t. anaphase?

a) Centromeres split and chromatids separate

b) Chromosomes are moved to spindle equator

c) Chromatid splits by recombinase activity

d) None of these

Answer : Centromeres split and chromatids separate

Question : Which one of the following events is incorrect for cell cycle?

a) All events are under genetic control

b) Maximum cell growth occurs in M-phase

c) DNA synthesis occurs only during one specific

d) Centriole duplication occurs in S-phase

Answer : All events are under genetic control

Question : The sequence of events by which a cell duplicates its genome, synthesises other constituents of the cell and eventually divide into two daughter cell is termed as

a) M-phase

b) Karyochorists

c) Cell cycle

d) None of these

Answer : M-phase

Question : Lampbrush chromosomes are seen in which typical stage?

a) Meiotic prophase

b) Mitotic prophase

c) Mitotic anaphase

d) Mitotic metaphase

Answer : Meiotic prophase

Question : In telophase of mitosis, the mitotic spindle breaks down and nuclear membranes form. This is essentially the opposite of what happens in

a) prophase.

b) metaphase.

c) interphase.

d) None of these

Answer : prophase.

Question : Which of the following carry the same genetic information?

a) sister chromatids

b) X and Y chromosomes

c) all autosomes

d) homologous chromosomes

Answer : sister chromatids

Question : Which of the following is true of kineto-chores?

a) All of the above

b) They are localized at the centromere of each chromosome

c) They are the sites where microtubules attach to separate the chromosomes.

d) They are organized so that there is one per sister chromatid in meiosis

Answer : All of the above

Question : Chromosome movement during anaphase is the result of

a) Both

b) None of these

c) the molecular motors at the kinetochores that move the chromosomes toward the poles.

d) shortening of the microtubules at the centrosome that pull the chromosomes toward the poles

Answer : the molecular motors at the kinetochores that move the chromosomes toward the poles.

Question : Programmed cell death (apoptosis)

a) is a natural process during development

b) is signaled by the initiated of mitosis

c) occurs in cells that have been deprived of essential nutrients.

d) None of these

Answer : is a natural process during development