Tag: mitosis

Quizzes (4) Questions (61)

Questions Related to mitosis

Multiple choice biology division for growth and reproduction cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

Which of the following is the most direct cuse of polyteny in somatic cells of certain organisms?

  1. RNA transcription

  2. supercoiling of chromatin

  3. chromosome replication without cell division

  4. chromosome recombination

  5. amphification of sex chromosomes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The most direct cause of polyteny in somatic cells of certain organisms is chromosomes replication without cell division
In polyteny homologns chromosomes perform somatic pairing and product remain attached to another ,they produce  several copies of same chromosomes

Multiple choice biology division for growth and reproduction cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

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

  1. All events are under genetic control

  2. Maximum cell growth occurs in M-phase

  3. DNA synthesis occurs only during one specific

  4. Centriole duplication occurs in S-phase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All the different cells of our body usually live, grow and divide in harmony. Our body has many different signals that control how much, and how often our cells divide. If any of these signals are faulty or missing, the result can be cancer, where too many cells are produced.

So, the correct option is 'All events are under genetic control'.

Multiple choice biology division for growth and reproduction cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

The most dramatic period of the cell cycle is?

  1. Metaphase
  2. $G _1$ phase

  3. S phase

  4. Interphase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The major events that take place in mitosis are the alignment of chromosomes at the center of the cell and the subsequent separation of sister chromatids to opposite mitotic spindle poles. Those occur in metaphase and anaphase respectively.

So, the correct option is 'Metaphase'.

Multiple choice biology division for growth and reproduction cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

Intermitosis is

  1. Stage between meiosis I and meiosis II

  2. Stage between two mitotic divisions

  3. Interphase

  4. Both B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interkinesis (often misspelled as intermitosis) is the short resting phase between meiosis I and meiosis II. It is distinct from the interphase that occurs before the start of meiosis I.

Multiple choice biology division for growth and reproduction cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

How many chromosomes will the cell have at GI, after S and after M-phase respectively if it has 14 chromosomes at interphase

  1. 7, 14, 14

  2. 14, 14, 14

  3. 14, 14, 7

  4. 7, 7, 7
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At G1 phase, there will be 14 chromosomes as no DNA replication has taken place. After S Phase, the DNA content doubles but chromosome number still remains same here 14. After completion of M phase, the number of chromosomes will be 28 with each daughter cell having same number of chromosomes as that of parent i.e 14

Therefore B is the correct option. 

Multiple choice biology division for growth and reproduction cell division in embryo development structure of chromosome, cell cycle and cell division component of the cell different types of reproduction reproductive health of humans need of family planning tissues of animals mitosis reproductive health

Match the lists and choose the correct option:

a. $G _1$ phase i. Replication of DNA
b. S-phase ii. Quiescent stage
c. $G _2$-phase iii. Condensation chromatin
d. $G _0$-phase iv. Protein synthesis
v. Interval between mitosis and initiate of DNA replication

  1. a-iii, b-ii, c-i, d-ii

  2. a-v, b-iv, c-i, d-iii

  3. a - v, b -i, c - iv, d-ii

  4. a v, b -ii, c-iii, d - iv
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Interphase generally lasts at least 12 to 24 hours in mammalian tissue. During this period, the cell is constantly synthesizing RNA, producing protein and growing in size. Interphase can be divided into 4 steps: Gap 0 (G0), Gap 1 (G1), S (synthesis) phase, Gap 2 (G2).
Gap 0 (G0): There are times when a cell will leave the cycle and quit dividing
Gap 1 (G1): Cells increase in size in Gap 1, produce RNA and synthesize protein.
S Phase: To produce two similar daughter cells, DNA replication occurs during this S (synthesis) phase.
Gap 2 (G2): During the gap between DNA synthesis and mitosis, the cell will continue to grow and produce new proteins.
Hence answer is 'a - v, b -i, c - iv, d-ii'
Multiple choice biology cell division cell division in embryo development division for growth and reproduction structure of chromosome, cell cycle and cell division mitosis

Which stage of cell cycle occurs immediately prior to mitosis 

  1. $M$
  2. $G _1$
  3. $S$
  4. $G _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$G _2$ phase is the phase of cell cycle occurs immediately prior to mitosis.
sequence of cell cycle is -- $G _1$ to $S$ to $G _2$ to $M$ to cytokinesis.

So, the correct answer is '$G _2$

Multiple choice biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

The method of reproduction in unicellular organisms like amoeba and bacteria in which they split into two equal halves and produce new ones is called ............

  1. Fragmentation

  2. Binary fission

  3. Budding

  4. Spore formation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In binary fission, parent cell divides into two equal halves called daughter cells. Daughter cells are identical to each other and to their parent cell. Organisms like the amoeba, bacteria, euglena, etc. exhibit binary fission. During multiple fission, the organism divides itself into numerous daughter cells.

So, B is the correct option.

Multiple choice biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

In animal cells, cytokinesis involves 

  1. Separation of sister chromatids

  2. Contraction of ring of microfilaments

  3. Depolymerisation of kinetochore microtubules

  4. Protein kinase that phosphorylates other enzymes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During cytokinesis in animal cells, a contractile ring composed of actin microfilaments and myosin forms beneath the plasma membrane. The constriction of this ring pinches the cell into two daughter cells.

Multiple choice biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

In animal cytokinesis, cleavage occurs with the help of

  1. Microtubules

  2. Spindle fibres

  3. Microfibrils

  4. Microfilaments
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In animal cells, cytokinesis is achieved by the formation of a contractile ring composed of actin microfilaments, which pinches the cell membrane inward.