Tag: structure of chromosome, cell cycle and cell division

Questions Related to structure of chromosome, cell cycle and cell division

The correct order of the various phases of eukaryotic cell cycle is ____________.

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

  1. G${ _1}$ to S to G${ _2}$ to M to cytokinesis

  2. G${ _1}$ to G${ _2}$ to M to S to mitosis

  3. G${ _1}$ to G${ _2}$ to S to M to karyokinesis

  4. S to G${ _1}$ to G${ _2}$ to M to cytokinesis

  5. G${ _2}$ to M to S to G${ _1}$ to cytokinesis

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Correct Option: A

Identify, the correct sequence of the cell cycle events.
I. Nuclear membrane dissolves
II. Cell size increases
III. Two daughter cells form
IV. DNA replicates

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

  1. I, IV, II and III

  2. I, IV, III and II

  3. II, I, IV and III

  4. II, IV, I and III

  5. IV, II, III and I

Show answer
Correct Option: D
Explanation:

The cell cycle includes a series of events, that take place  in a cell which leads to the duplication of DNA and division of cells to form two daughter cells. This takes place in three different  periods and can be referred to as Interphase , Mitotic phase(M) and cytokinesis. While during the interphase or the initial phase, the cells grow in size and is ready for division, during the mitosis, the DNA starts duplicating, the nuclear membrane dissolves and the cells starts its division process to give rise to  two distinct daughter cells. Cytokinesis is the stage during which the two daughter cells are formed and separated.
So, the correct answer is option D.

Mitotic cell cycle is divided typically into four phases, $G _1$, S, $G _2$ and M. Considering a mitotic cycle time of $18$ hours, the distribution of period of time(in hours) for each of these phase will be. $G _1$S$ _2$M.

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

  1. $1, 3, 5, 9$

  2. $9, 1, 3, 5$

  3. $9, 5, 3, 1$

  4. $3, 5, 9, 1$

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Correct Option: A

Yeast complete cell cycle in _____________.

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

  1. 30 minutes

  2. 60 minutes

  3. 90 minutes

  4. 120 minutes

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Correct Option: C
Explanation:

One cell cycle of yeast is almost 90 minutes and a human cell takes almost 24 hours to divide by mitosis therefore by calculations it seems that a yeast can perform mitosis almost 16 times in the time of 1 division of a human cell.

Thus 90 is correct option. 

Cell cycle was discovered by 

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

  1. Farmer and Moore

  2. Prevost and Dumas

  3. Howard and Pelc

  4. Remak

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Correct Option: A

In a culture of E.coli the cell population increased from $1.5 \times 10^6$ cells /ml to $ 12 \times 10^6$ cells/ml in 36 minute.The generation time is 

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

  1. 6 mt

  2. 9 mt

  3. 12 mt

  4. 18 mt

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Correct Option: C
Explanation:

At the start, the culture of E. coli has cell population of 1.5 X 10$^6$ cells/ml. After first generation, it will be doubled, that is 3 X 10$^6$ cells/ml. After second generation, it will be 6 X 10$^6$ cells/ml. After third generation, it will be 12 X 10$^6$ cells/ ml. It is given that for a cell population to increase from 1. 5 X 10$^6$ cells/ml to 12 X 10$^6$ cells/ml, it takes 36 minutes. It means, for 3 generation, it takes 36 minutes. So, its generation time is 36/3 = 12.

Thus, the correct answer option C.

Cdk which control progression through cell cycle check points are fully activated by.

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

  1. Binding to cyclin

  2. Phosphorylation by Cdk activating protein kinase

  3. Binding to cyclin, plus phosphorylation by Cdk activating protein kinase

  4. Phosphorylation by tyrosine kinase

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Correct Option: C
Explanation:

Through phosphorylation, Cdks signal the cell that it is ready to pass into the next stage of the cell cycle. As their name suggests, Cyclin-Dependent ProteinKinases are dependent on cyclins, another class of regulatory proteins. Cyclins bind to Cdks, activating the Cdks to phosphorylate other molecules.

So, the correct option is ‘binding to cyclin, plus, phosphorylation by Cdk activating protein kinases’.

Which cellular organelles are involved in initration of intrinsic pathway of apoptosis?

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

  1. ER

  2. lysosme

  3. mitochondria

  4. All of the above

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Correct Option: D
Explanation:

The death of cells which occurs as a normal and controlled part of an organism's growth or development is called apoptosis. In this endoplasmic reticulum, lysosome, mitochondria, Golgi complex are involved.

So, the correct option is ‘ER, lysosome, mitochondria’. 

Which represents the correct sequence of stages in the cell cycle?

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

  1. $G _1$ ,$G _2$, S,M

  2. $G _1$, $G _2$,M,S

  3. $G _1$ ,M, $G _2$,S

  4. $G _1$ , S, $G _2$,M

Show answer
Correct Option: D
Explanation:

The cell progresses through defined phases of the cell cycle during its division.

first, the G1 in which some organelles starts their duplication then comes S phase where DNA has doubled then G2 phase and finally the M phase. 
So the correct sequence is 'G1,S,G2,M'.

Of the total duration of cell cycle, the interphase lasts more than.

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

  1. $95$%

  2. $5$%

  3. $90$%

  4. $92$%

Show answer
Correct Option: A