Cell Cycle and Cell Division - Live Session Contact Number: 9667591930 / 8527521718Cell Cycle and Cell Division - Live Session Contact Number: 9667591930 / 8527521718The sequence of events by which cells duplicate their genome, synthesize the other components of cell which eventually distribute into two daughter cells is called
(1) Quiescent stage
(2) Generation time
(3) Cell cycle
(4) Kinetochore
A biosynthetic phase where cell organelle duplicate itself is
(1) Interphase
(2) Anaphase
(3) Prophase
(4) Telophase
Yeast can progress through the cell cycle in about
(1) 90 sec
(2) 90 min
(3) 90 hrs
(4) 90 yrs
Interphase is called the resting phase because
(1) It is the most active phase of the cell cycle
(2) It does not involve any activity related to cell division
(3) It does not prepare cell for cell division
(4) It is the phase where cell rests before entering into mitosis
If the initial amount of DNA is 8 C, then after S phase the amount of DNA would be
(1) 4 C
(2) 8 C
(3) 64 C
(4) 16 C
The number of chromosomes in G1 phase is 36, the number of chromosomes in S phase is
(1) 36
(2) 18
(3) 22
(4) 37
Most dramatic period of cell cycle is
(1) G1 phase
(2) G2 phase
(3) S phase
(4) M phase
Which type of cell division is called somatic cell division?
(1) Meiosis I
(2) Meiosis II
(3) Reduction division
(4) Mitosis
Nucleolus and nuclear membrane disappear during
(1) Anaphase
(2) Interphase
(3) Telophase
(4) Prophase
Read the following statements
(a) Complete disintegration of the nuclear envelope marks the start of the second phase of mitosis.
(b) Metaphase chromosome is made up of one sister chromatid.
(1) Only (b) is correct
(2) Both (a) & (b) are incorrect
(3) Only (a) is correct
(4) Both (a) & (b) are correct
The point of attachment of microtubules on the chromosome is called as
(1) Centromere
(2) Kinetochore
(3) Chromatid
(4) Spindle
If karyokinesis is not followed by cytokinesis, then gives rise to
(1) Zygote
(2) Fertilised egg
(3) Multinucleate condition
(4) Embryo
In pachytene, each tetrad contains
(1) Two chromatids
(2) One chromatid
(3) Four chromatids
(4) Three chromatids
_________ marks the site where crossing over had occurred.
1. Diakinesis
2. Synapsis
3. Chiasmata
4. Leptotene
Major check point of cell cycle is
(1) G1 S transition
(2) S G1 transition
(3) G2 M transition
(4) M G2 transition
What will be the amount of DNA in meiosis II products if meiocyte contains 30 Pg DNA in G1 phase?
(1) 30 Pg
(2) 60 Pg
(3) 15 Pg
(4) 120 Pg
Select an incorrect statement with respect to cell cycle
(1) Duplication of genes occurs twice in meiosis
(2) Karyokinesis occurs twice during meiotic division
(3) Cyclins are proteins that activate protein kinases to regulate the cell cycle
(4) After telophase-I, chromosome number is reduced to half.
Cyclin Dependent Kinases (CDKs)
(1) Act as mitotic poisons
(2) Cause disassembly of the microtubules
(3) Control various phases of cell cycle
(4) Arrest cell division due to non-formation of spindle
Higher plants differ from animals in having
(1) Spindle microtubule
(2) Anastral mitosis
(3) Kinetochores
(4) Disappearance of nucleolus during prophase
Which of the following phases are longest and shortest in mitosis?
(1) Metaphase, Anaphase
(2) Prophase, Anaphase
(3) Telophase, Anaphase
(4) Prophase, Telophase
How many generations are required by a cell of meristem to produce 128 cells?
(1) 127
(2) 64
(3) 32
(4) 7
Phragmoplast is formed by golgi complex and grows
(1) Centripetally to form cell plate
(2) Centrifugally to form cell plate
(3) Centripetally to produce a cleavage furrow
(4) Centrifugally to form a cleavage furrow
Cytokinesis in a plant cell is achieved by the formation of cell plate instead of a cleavage furrow, which is formed in
(1) Centripetal manner
(2) Centrifugal manner
(3) Both centripetal and centrifugal manner
(4) Equational manne
All are the essential stages that take place during meiosis, except
(1) Two successive divisions without any DNA replication occuring between them
(2) Formation of chiasmata and crossing over
(3) Segregation of homologous chromosomes
(4) Number of chromosomes in daughter cells after meiosis II is reduced to half but the amount of DNA remains the same
To produce 102 pollen grains, how many meiotic divisions are required?
(1) 25
(2) 25.5
(3) 26
(4) 27
The enzyme recombinase is required at which stage of meiosis
(1) Pachytene
(2) Zygotene
(3) Diplotene
(4) Diakinesis
Meiosis takes place in :
(1) Conidia
(2) Gemmule
(3) Megaspore
(4) Meiocyte
Synapsis occurs between
(1) mRNA and ribosomes
(2) Spindle fibres and centromere
(3) Two homologous chromosomes
(4) A male and a female gamete
Centromere is required for
(1) Transcription
(2) Crossing over
(3) Cytoplasmic cleavage
(4) Movement of chromosomes towards poles
A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics?
(1) Late prophase – chromosomes move to spindle equator
(2) Metaphase – spindle fibres attached to kinetochores, centromeres split and chromatids separate
(3) Metaphase – chromosomes moved to spindle equator chromosomes made up of two sister chromatids
(4) Anaphase – centromeres split and chromatids separate and start moving away
How many chromosomes will the cell have at G1, after S and after M phase respectively, if it has 14 chromosomes at interphase?
(1) 14, 14, 7
(2) 14, 14, 14
(3) 7, 7, 7
(4) 7, 14, 14
Colchicine is an inhibitory chemical, which
(1) Stops the functioning of centriole
(2) Prevents attaching of centromeres with rays
(3) Prevents the spindle formation in mitosis
(4) Prevents the formation of equatorial plane
A bacterium divides every 35 minutes. If a culture containing 105
cells per ml is grown for 175 minutes, what will be the cell concentration per ml after 175 minutes?
(1)
(2)
(3)
(4)
The term “Meiosis” was given by
(1) A. Flemming
(2) Farmer and Moore
(3) Johansen
(4) Knoll and Ruska
Crossing over that results in genetic recombination in higher organisms occurs between
(1) Sister chromatids of a bivalent
(2) Non-sister chromatids of a bivalent
(3) Two daughter nuclei
(4) Two different bivalents