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551.

Select the correct mathcA. Quiescent phase-`G_(2)` phaseB. Synthesis phase-`G_(1)` phaseC. Centromere splittting -AnaphaseD. Chromosomal condensation-Telophase

Answer» Correct Answer - C
`G_(0)` phase is known as quiescent phase S phase is known as synthesis phase. Chromosomal condensation occurs in metaphase.
Discussion
552.

In disjunction (separation) of sister chromatids at anaphaseA. centromere moves first and arms trail behindB. arms move first and centromere trails behindC. any of the above casesD. centromere does not move in anaphase

Answer» Correct Answer - A
Discussion
553.

Assertion: Karyokinesis follows cytokinesis. Reason: Karyokinesis is the division of cytoplasm into two daughter cells.A. If both assertion and reason are true and reason is the correct explantion of assertionB. If both assertion and reason are true but reason is not the correct explnantion of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - D
Cytokinesis si the division of cytoplasm. Cytokinesis follows karyokinesis. Karyokinesis is the division of nucleus. The M phase starts with neculear division, corresponding to the separation of daughter chromosomes and leads to division of cytoplasm.
Discussion
554.

Name the stage of cell cycle at which one of the following events occur: (i) Chromosomes are moved to spindle equator (ii) Centromere splits and chromatids separate (iii) Pairing between homologous chromosomes takes place (iv) Crossing over between homologous chromosomes takes placeA. Anaphase, Metaphase, Zygotene, PachyteneB. Metaphase, Pachytene, Zygotene, DiploteneC. Metaphase, Anaphase, Zygotene, PachyteneD. Anaphase, Metaphase, Pachytene, Zygotene.

Answer» Correct Answer - C
Discussion
555.

Name the stage of cell cycle at which one of the following events occur: (i) Chromosomes are moved to spindle equator (ii) Centromere splits and chromatids separate (iii) Pairing between homologous chromosomes takes place (iv) Crossing over between homologous chromosomes takes place

Answer» (i) Metaphase
(ii) Anaphase
(iii) Zygotene of meiosis I (iv)
Pachytene of meiosis I
Discussion
556.

The separation of two chromatids of each chromosome at early anaphase is initiated byA. the interaction of centromere with the chromosomal fibresB. the elongation of metaphasic spindleC. the force of repulsion between the divided kinetochoresD. all of these

Answer» Correct Answer - C
Kinetochore is a plate-like structure by which microtubules of the spindle attach to the centromere of a chromosome during nuclear division. The centromere of each chromosome divides into two, so that each chormatied comes to have its own centromere. The two chromatids now start repelling each otherand separate completely to become daughter chromosmes. the daughter or new chromosmes. The daughter or new chromosomes move towards the poles of spindle along the path of their chromosome fibres.
Discussion
557.

____ is characterised by all the chromosomes coming to lie at the equator, with one chromatid connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibres from the opposite pole.A. ProphaseB. MetaphaseC. AnaphaseD. Telophase

Answer» Correct Answer - B
Discussion
558.

How many ATP is required during anaphase to move chromosomes from equator to the polesA. 38ATPB. 5ATPC. 30ATPD. 76ATP

Answer» Correct Answer - c
Discussion
559.

Assertion: During anaphase, centromere of each chromosome splites and chromatids separate. Reason: During anaphase, chromatids move to opposte poles.A. If both assertion and reason are true and reason is the correct explantion of assertionB. If both assertion and reason are true but reason is not the correct explnantion of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - B
In anaphase, chormosomes are arranged on the equatorial plate for a short period. In anaphase centromeres of chormosomes start to divide into two, forming daughter chromatids with centromere in each. Daughter chromosomes are repulsive so, migrate towards opposite poles. Spindle fibres attached to the centromeres shorten and pull the chromosomes to the poles. In anaphasic movement of chormosomes, the centromeres lead the path while the limbs trail behind. So anaphasic chromosomes appear as V-,L-,J- and I-shaped.
Discussion
560.

At which stage of mitosis, the two daughter chromatids separate from each other, migrate towards the opposite poles and are now referred to as chromosomes of the future dautghter nuclei?A. ProphaseB. MetaphaseC. AnaphaseD. Telophase

Answer» Correct Answer - C
In anaphase, the cetromeres of chromosomes start to divide into two, forming daughter chromosomes with centromere in each. Daughter chromosmes are repulsive, so they migrate towards opposite poles. Spindle fibles attached to the centromeres shorten and pull the chromosomes to the poles.
Discussion
561.

The movement of homologous chromosomes toward the opposite poles occur by the contraction of spindle fibres duringA. AnaphaseB. Anaphase-IC. Anaphase-IID. Metaphase

Answer» Correct Answer - C
Discussion
562.

During the metaphase stage of mitosis, spindle fibres attach to chromosomes atA. KinetochoreB. Both centromere and kinetochoreC. Centromere, kinetochore and adjoining centromereD. Centromere

Answer» Correct Answer - A
During the metaphase stage of mitosis ,spindle fibres attach to chromosomes at kinetochore.
Discussion
563.

Assertion: Small disc-shaped structures at the surface of the centromeres are called kinetiochores. Reason: Kinetochores serve as the sites of attachement of spindle fibres to the centreomeres.A. If both assertion and reason are true and reason is the correct explantion of assertionB. If both assertion and reason are true but reason is not the correct explnantion of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - B
In metaphase, discontinous fibres radiate out from two spindle poles and get connected to the disc shaped structure at the surface of the centroemre called kinetochores. These are called chormose fibres or tractile fibrils. A kinetochore is a complex protein sturcutre that is analogous to a ring for the mictrotubule hook, it is the point where microtubules attach themselves to the chromosome.
Discussion
564.

During anaphase, the chromosomes of the future daughter nuclei, begin their migration towards the two opposite poles. These are calledA. daughter chromatidsB. chromatids moving to opposite polesC. daughter chromosomesD. chromosomes

Answer» Correct Answer - B
Discussion
565.

In onion root tip during metaphase stage of mitosis the number of kinetochores will beA. 4B. 8C. 16D. 32

Answer» Correct Answer - D
In onion root tip during metaphase stage of mitosis the number of kinetochors will be 32. Number of kinetochore =2`xx` number of chromosomes(16)
Discussion
566.

Identify the correct stage in cell division with its characteristics. .A. Telophase-Endoplasmic reticulum and nucleolus not reformed yetB. Telophase-nuclear envelop reforms, golgi complex reformsC. Late anaphase-Chromosomes move away from equatorial plate, golgi complex not presentD. Cytokinesis-cell plate formed, mitochondria distributed between two daughter cells

Answer» Correct Answer - B
Discussion
567.

Name the stage of mitosis in which chromosomes are arranged on the equator of spindleA. ProphaseB. metaphaseC. AnaphaseD. Telophase

Answer» Correct Answer - B
Discussion
568.

Name the stage of mitosis in which chromosomes are arranged on the equator of spindleA. AnaphaseB. MetaphaseC. Late prophaseD. S phase

Answer» Correct Answer - B
Discussion
569.

Which of the following events takes place during anaphase stage of mitosis I. Spindle fibres attach to kinetochores of chromosomes II. Centromeres split and chromatids separate III. Chromatids move to opposite poles IV. Nucleolous, Golgi complex and E.R. reformA. I and IIB. II and IIIC. III and IVD. I and IV

Answer» Correct Answer - B
Discussion
570.

At anaphase stage of mitosis I. The centromeres split into two and the spindle fibres pull the daughter centromeres to opposite poles. II. Chromosomes shorten and thicken by coiling and tighten packaging of their components. III. The separated chromatids are pulled along behind the centromeres. IV. Chromosomes line up around the equator of the spindle. Choose the option which correct statement(s).A. I and IIB. II and IVC. Ony IIID. I and III

Answer» Correct Answer - D
Discussion
571.

Name the stage of mitosis in which chromosomes are arranged on the equator of spindleA. AnaphaseB. MetaphaseC. ProphaseD. Telophase

Answer» Correct Answer - B
The stage of mitosis in which chromosomes are arranged on the equator of spindle is metaphase.
Discussion
572.

Which of the following stage is affected by colchicum Or Spindle apparatus is formed during which stage of mitosisA. MetaphaseB. ProphaseC. InterphaseD. Anaphase

Answer» Correct Answer - a
Colchicine is obtained form cochicum autumnale plant, which inhibits the formation of spindle fibers in metaphase.
Discussion
573.

`"G_(0)"` state of cells in eukaryotic cell cycle denotesA. Check point before entering the next phaseB. Pausing in the middle of a cycle to cope with a temporary delayC. Death of a cellD. Exit of cells form cell cycle

Answer» Correct Answer - d
When cells are not to divide after `G_(1)` phase and start undergoing differentation into specific types of cells such cells are said to be in `G_(0)` phase / `G_(0)` state.
Discussion
574.

Cyclin Dependent kinases (CDKs)A. Act as mitotic poisonsB. Cause disassembly of the mircrotubulesC. Control various phases of cell cycleD. Arrest cell division due to non-formation of spindle

Answer» Correct Answer - C
Discussion
575.

Cytokinesis

Answer» The provision of division of cytoplasm is known as cytokinesis.
Discussion
576.

How do plants continue to grow all their lifespan ?

Answer» The plants continue to grow due to cell division.
Discussion
577.

Interkinesis or intrameiotic interphase shows/ isA. Centriole duplicationB. DNA synthesisC. Generally short livedD. More than one option is correct

Answer» Correct Answer - D
Discussion
578.

what is interkinesis?

Answer» Interkinesis is a stage between telophase I of meiosis I and prophase II of meiosis II.
Discussion
579.

Assertion: The stage between the two meiotic divisions is called interkinesis. Reason: Interkinesis is generally short lived.A. If both assertion and reason are true and reason is the correct explantion of assertionB. If both assertion and reason are true but reason is not the correct explnantion of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - B
The stage between two meiotic divisions is called interkinesis and is generally short lived. Here the cell undergoes a period of rest. NO DNA replication and no gene duplication occurs during this stage. Protein and RNA synthesis may occur. It is important for bringing true haploidy in daughter cells.
Discussion
580.

Which one amoung the following is correct ?A. DNA content becomes double during `G_(1)`-phaseB. Duration of interphase is short as compared to M-phaseC. `G_(2)`-phase follows mitotic phaseD. DNA-replication occurs in S-phase

Answer» Correct Answer - D
Discussion
581.

How many chromosomes will the cell have at `G_(1)`,after S and after M-phase respectively if it has 14 chromosomes at interphaseA. 7,14,14B. 14,14,14C. 14,14,7D. 7,7,7

Answer» Correct Answer - B
Discussion
582.

Congression isA. movement of sister chromatids towards the polesB. pairing of homologous chromosomesC. separation of paired chromosomesD. bringing the chromosomes on equator of spindle apparatus

Answer» Correct Answer - D
Discussion
583.

In which of the following stage, the chromosome is thin and like long threadA. leptoteneB. ZygoteneC. PachyteneD. diakinesis

Answer» Correct Answer - A
Discussion
584.

Identify the stage of mitosis with its characteristics A. Metaphase-Spindle fibres attached to kinetochores, centromeres split an chromatids separateB. Metaphase-Chromosomes moved to spindle equator, chromosomes made up of two sister chromatidsC. Anaphase -Centromeres split and chromatids separate and start moving awayD. Late prophase-Chormosomes move to spindle equator

Answer» Correct Answer - B
Discussion
585.

Anastral mitosis is found inA. AnimalsB. Higher plantsC. BacteriaD. Gyanobacteria

Answer» Correct Answer - b
Discussion
586.

Cellular structure always disappears during mitosis isA. Cell wallB. Cell membraneC. NucleorolusD. All th above

Answer» Correct Answer - c
Discussion
587.

Which among the following is ot a significance of mitosis?A. growth of unicellular animals takes place due to mitosisB. it restrores the nucleocytoplasmic ratioC. it contributes to cell repair and asexual reproductionD. It leads to the production of diploid daughter cell

Answer» Correct Answer - A
Discussion
588.

The mitotic poisons which inhibit prophase areA. colchicine and mustard gasB. mustard gas and azideC. ribonuclease, azide and cyanideD. cyanide and colchicine

Answer» Correct Answer - C
Discussion
589.

Crossing over occurs betweenA. non-sister chromatids of non-homologous chromosomesB. non-sister chromatids of homologous chromosomesC. sister chromatids of homolgous chromosomesD. sister chromtids of non-homologous chromosomes

Answer» Correct Answer - B
Discussion
590.

Crossing-over occurs inA. single-strand stageB. two-strand stageC. four-strand stageD. eight-strand stage

Answer» Correct Answer - C
Discussion
591.

Identify the correct statement.A. Mitosis occur in plants when there is a change from sporophyte to gametophyteB. meiosis produces genetically identical daughter cellsC. mitosis ensures genetic continuity from generation to generationD. after meiosis-II, the daughter cells are diploid.

Answer» Correct Answer - C
Discussion
592.

The centromere or primary constriction of the cromosome contains ring of protein that are intimately associated with a spindle fibre. These ring are calledA. CenriolesB. Secondary constrictionsC. AstersD. Kinetochores

Answer» Correct Answer - D
The centromere or primary constriction of the chromosome contains rings of proteins that are intimately associated with a spindle fibre. These rings are called kinetochores.
Discussion
593.

The protein for spindle fibre isA. MyosiB. ActinC. TroponinD. Myoglobin

Answer» Correct Answer - a
Discussion
594.

In Metaphase I, from each centromere of a chromosome, how many chromosomal fibres (Tractile fibres) arise towards poles ?A. 2B. 1C. `4-20`D. 4

Answer» Correct Answer - B
Discussion
595.

Analyse the events during every stage of cell cycle and notice how the following two parameters change (i) Number of chromosomes (N) per cell (ii) Amount of DNA content (C) per cell Answer

Answer» During meiosis, the number of chromosomes and the amount of DNA in a cell change.
(i) Number of chromosomes (N) per cell During anaphase I of the meiotic cycle, the homologous chromosomes separate and start moving toward their respective poles. As a result, the bivalents get divided into two sister chromatids and receive half the chromosomes present in the parent cell.
Therefore, the number of chromosomes reduces in anaphase I.
(ii) Amount of DNA content (C) per cell
During anaphase II of the meiotic cycle, the chromatids separate as a result of the splitting of the centromere. It is the centromere that holds together the sister chromatids of each chromosome. As a result, the chromatids move toward their respective poles. Therefore, at each pole, a haploid number of chromosomes and a haploid amount of DNA are present.
During mitosis, the number of chromosomes remains the same. The DNA duplicated in the S phase gets separated in the two daughter cells during anaphase. As a result, the DNA content (C) of the two newly-formed daughter cells remains the same.
Discussion
596.

The best stage to view structure, size and to count the number of chromosomes isA. MetaphaseB. Late prophaseC. TelophaseD. I-phase

Answer» Correct Answer - A
Discussion
597.

Shape of chromosome can be best observed duringA. MetaphaseB. AnaphaseC. TelophaseD. Late prophase

Answer» Correct Answer - B
Discussion
598.

Which is called direct cell division ?A. MitosisB. AmitosisC. MeiosisD. All cell divisions

Answer» Correct Answer - A
Discussion
599.

If 2n=4, then identify the figures A,B and C, as per the following codes and select the correct option Anaphase of meiosis I=(i) Anaphase of mitosis =(ii) Anaphase meiosis II =(iii)A. ii,i,iiiB. iii,ii,iv,iC. i,ii,iiiD. iii,i,ii

Answer» Correct Answer - A
During anaphase of mitosis, each chromosome arranged at metaphase plate is split and two daughter chromatids are formed. Centromeres split and chromatids move to opposite poles. During anphase I of meiosis I, the homologous chormosomes separate, while sister chromatids remain associated at their centromeres. Anaphase II of meiosis II begins with simultanoeus splitting of the centromere of each chromosome allowing them to move towards oppostie poles of the cell.
Discussion
600.

Find examples where the four daughter cells from meiosis are equal in size and where they are found unequal in size.

Answer» (a) Spermatogenesis or the formation of sperms in human beings occurs by the process of meiosis. It results in the formation of four equal-sized daughter cells.
(b) Oogenesis or the formation of ovum in human beings occurs by the process of meiosis. It results in the formation of four daughter cells which are unequal in size.
Discussion