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51.

What is the final stage of karyokinesis?(a) Prophase(b) G2 phase(c) Telophase(d) G1 phaseI got this question by my college director while I was bunking the class.The origin of the question is Cell Cycle and Division topic in division Cell Cycle and Cell Division of Biology – Class 11

Answer»

Right choice is (c) TELOPHASE

To explain: Karyokinesis is the division of the nucleus. This PROCEEDS after the GENETIC material has been replicated and the SISTER chromatids have undergone separation. Thus, the final stage of karyokinesis is telophase, which is the last stage of mitosis.
Discussion
52.

Compaction of chromosomes occurs during ______(a) zygotene(b) pachytene(c) diplotene(d) leptoteneI got this question during an interview.My question is based upon Cell Cycle and Division in section Cell Cycle and Cell Division of Biology – Class 11

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Correct choice is (d) LEPTOTENE

For EXPLANATION: Chromosomes have to become decondensed and compact before they can undergo cell division. Hence, chromosomal COMPACTION occurs during the leptotene stage of prophase I of MEIOSIS I.
Discussion
53.

In which of these animals does a haploid cell divide mitotically?(a) Humans(b) Male honey bees(c) Female honey bees(d) RatsThis question was addressed to me during an online interview.This question is from Cell Cycle in division Cell Cycle and Cell Division of Biology – Class 11

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Right ANSWER is (b) Male honey BEES

The EXPLANATION: Haploid CELLS which have only one copy of chromosomes divide mitotically in male honey bees. This is in contrast to the GENERAL pattern of haploid germ cells dividing meiotically in most animals.
Discussion
54.

Protein synthesis takes place in _____(a) G0 phase(b) G1 phase(c) G2 phase(d) S phaseThe question was asked in unit test.Question is from Cell Cycle in division Cell Cycle and Cell Division of Biology – Class 11

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The correct option is (c) G2 phase

Easiest explanation: Proteins are synthesized in the INTERPHASE in order to help initiate the M phase or mitosis phase and so that the two DAUGHTER cells each RECEIVE adequate PROTEIN. It takes place in G2 phase.
Discussion
55.

Which of these is the most eventful period of the cell cycle?(a) G1 phase(b) G2 phase(c) S phase(d) M phaseThe question was asked during an internship interview.This key question is from Cell Cycle and Division in section Cell Cycle and Cell Division of Biology – Class 11

Answer»

Correct choice is (d) M phase

For explanation: G1 phase, G2 phase and M phase are stages of the RESTING phase, known as interphase. Although CELL growth and DNA replication TAKE place during interphase, it is lesser than the EVENTS taking place during mitosis or M phase.
Discussion
56.

Arrange the phases of prophase I in order.(a) Leptotene → Zygotene → Pachytene → Diplotene(b) Zygotene → Leptotene → Pachytene → Diplotene(c) Leptotene → Pachytene → Zygotene → Diplotene(d) Zygotene → Leptotene → Diplotene → PachyteneI had been asked this question in class test.Question is taken from Cell Cycle and Division topic in chapter Cell Cycle and Cell Division of Biology – Class 11

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Correct option is (a) Leptotene → ZYGOTENE → Pachytene → DIPLOTENE

The best I can EXPLAIN: Prophase 1 is the first stage of meiosis. It is the first step of meiosis 1. It is divided into FOUR sub-phases-namely, Leptotene, Zygotene, Pachytene and Diplotene. Diplotene is FOLLOWED by diakinesis.
Discussion
57.

Which of these is an example of syncytium in coconut?(a) Fleshy endosperm(b) Liquid endosperm(c) Endocarp(d) MesocarpThe question was asked in a national level competition.Query is from Cell Cycle and Division in portion Cell Cycle and Cell Division of Biology – Class 11

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Correct CHOICE is (b) Liquid endosperm

To EXPLAIN I would say: Syncytium is a cytoplasmic mass of cells that are multinucleated. This multinucleate condition arises due to ABSENCE of CYTOKINESIS or CELL division following karyokinesis or nuclear division.
Discussion
58.

The cell-plate of plant cells represents the ______(a) middle lamella(b) primary cell wall(c) secondary cell wall(d) plasmodesmataI have been asked this question in unit test.This interesting question is from Cell Cycle and Division in section Cell Cycle and Cell Division of Biology – Class 11

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Correct CHOICE is (a) MIDDLE lamella

Easiest explanation: PLANT cells undergo separation by CELL-plate formation that starts from the center of the plant cell. It does not undergo furrowing like ANIMAL cells. The cell-plate represents the middle lamella.
Discussion
59.

Which of these structures are visible under the microscope at the end of prophase?(a) Nucleolus(b) Endoplasmic reticulum(c) Golgi bodies(d) AstersI had been asked this question in my homework.My doubt stems from Cell Cycle and Division topic in chapter Cell Cycle and Cell Division of Biology – Class 11

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The correct CHOICE is (d) Asters

Explanation: Prophase is the first phase of the M phase or the mitotic phase. At the end of prophase, the nucleolus, Golgi bodies and the ENDOPLASMIC reticulum are not VISIBLE. Asters are visible. They RADIATE in all directions from the centrosomes.
Discussion
60.

Distinct DNA is observable in G2 phase of cell cycle. True or false?(a) True(b) FalseI had been asked this question in quiz.The query is from Cell Cycle and Division topic in portion Cell Cycle and Cell Division of Biology – Class 11

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Correct answer is (a) True

To EXPLAIN: The G2 phase of the cell CYCLE is a PART of the interphase or resting phase. The chromosome is tangled and intertwined. Hence, DISTINCT strands of chromosomes are not observable.
Discussion
61.

Which of these statements is true about meiosis I?(a) Crossing over leads to genetic variability(b) Diplotene is short lived in vertebrates(c) Diakinesis is followed by cytokinesis(d) Chiasmata formation occurs during metaphase IThe question was posed to me by my school principal while I was bunking the class.The origin of the question is Cell Cycle and Division in division Cell Cycle and Cell Division of Biology – Class 11

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Correct option is (a) Crossing over leads to genetic variability

For EXPLANATION I would say: DIPLOTENE can last for years in some vertebrates, hence it is not ALWAYS short lived. Diakinesis is followed by metaphase I. Chiasmata is formed during diplotene. Crossing over leads to genetic VARIATION.
Discussion
62.

In which phase of the cell cycle does DNA replication take place?(a) Anaphase(b) Metaphase(c) Prophase(d) InterphaseThis question was posed to me in unit test.My doubt is from Cell Cycle topic in section Cell Cycle and Cell Division of Biology – Class 11

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Correct choice is (d) Interphase

Easiest EXPLANATION: DNA replication or synthesis takes place in the resting phase or interphase of the CELL CYCLE. It takes place during the S phase or synthesis phase. Prophase, METAPHASE and anaphase are a part of M phase.
Discussion
63.

How much time of the entire cell cycle is occupied by interphase?(a) 75%(b) 95%(c) 50%(d) 80%I have been asked this question in an online quiz.This intriguing question comes from Cell Cycle topic in portion Cell Cycle and Cell Division of Biology – Class 11

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Correct option is (b) 95%

To ELABORATE: The cell cycle is broadly classified into two phases-the INTERPHASE and the M phase. The M phase is the one in which actual cell division takes PLACE. It occurs rapidly and takes up 95% of the DURATION of the cell cycle.
Discussion
64.

What is the duration of cell cycle in yeast?(a) 30 minutes(b) 24 hours(c) 90 minutes(d) 48 hoursThe question was posed to me by my college professor while I was bunking the class.Question is from Cell Cycle in section Cell Cycle and Cell Division of Biology – Class 11

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Right answer is (c) 90 minutes

The best I can explain: The duration of the cell cycle of the single celled fungi yeast TAKES 90 minutes. This means that it undergoes INTERPHASE and M phase to produce two new identical daughter cells through cell DIVISION.
Discussion
65.

Which of these processes is not a part of the cell cycle?(a) Duplication of genome(b) Division into daughter cells(c) Synthesis of cell organelles(d) Degeneration of centrosomeThe question was asked in examination.Question is taken from Cell Cycle in division Cell Cycle and Cell Division of Biology – Class 11

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The correct CHOICE is (d) Degeneration of centrosome

The best explanation: Cell cycle involves duplication of the GENOME, division of the PARENT cell into two daughter cells, SYNTHESIS of cell organelles for the daughter cells, but centrosomes are not DEGENERATED.
Discussion
66.

Which process does the M phase of cell cycle start with?(a) Karyokinesis(b) Cytokinesis(c) Interphase(d) Spindle formationThe question was asked in a national level competition.Asked question is from Cell Cycle topic in chapter Cell Cycle and Cell Division of Biology – Class 11

Answer» RIGHT option is (a) Karyokinesis

To EXPLAIN I would say: The M phase of the cell cycle starts with karyokinesis or the separation of sister CHROMATIDS. It ends with cytokinesis or the DIVISION of the CYTOPLASM. The M phase occurs after interphase.
Discussion
67.

The period between two M phases is called ______(a) interphase(b) prophase(c) prometaphase(d) telophaseThis question was addressed to me in an international level competition.Query is from Cell Cycle topic in section Cell Cycle and Cell Division of Biology – Class 11

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Right CHOICE is (a) interphase

For explanation I would say: TWO successive M phases or mitosis phases are separated by a period of REST known as interphase. It is the PHASE in which newly formed daughter cells actively grow and synthesize cellular material for the next M phase.
Discussion
68.

What is the interval between mitosis and DNA replication?(a) S phase(b) G2 phase(c) G1 phase(d) M phaseThis question was posed to me in an interview for job.I need to ask this question from Cell Cycle in division Cell Cycle and Cell Division of Biology – Class 11

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Correct choice is (c) G1 phase

Easy EXPLANATION: G1 phase or gap 1 phase is the interval between the end of mitosis or M phase and the beginning of the REPLICATION or the SYNTHESIS of DNA in the synthesis phase. G2 phase follows the S phase.
Discussion
69.

Which of these is the correct order of events in the cell cycle?(a) G1 → G2 → S → M(b) G1 → G2 → M → S(c) G1 → S → G2 → M(d) S → M → G1 → G2This question was posed to me in an interview for job.The query is from Cell Cycle in portion Cell Cycle and Cell Division of Biology – Class 11

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The CORRECT answer is (c) G1 → S → G2 → M

To elaborate: The cell cycle starts with the first gap phase or G1, FOLLOWED by the SYNTHESIS phase or S phase. This is followed by the second gap phase or G2. These are parts of the interphase, which is then followed by the M phase.
Discussion