Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 83

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following precedes re-formation of the nuclear envelope during M-phase of the cell cycle?

A
Decondensation from chromosome and reassembly of the nuclear lamina

B
Transcription from chromosome and reassembly of the nuclear lamina

C
Formation of the contractile ring and formation of the phragmoplast

D
Formation of the contractile ring and transcription from chromosomes

Solution

M phase is known as mitotic phase and cell division occurs in this phase. The re-formation of the nuclear envelope during M-phase of the cell cycle takes place during telophase. The nuclear membrane which disappears during propahse reappears in the telophase. But before it is reformed the nucleus gets reorganised by decondensation from chromosome and reassembly of the nuclear lamina.
So, the correct answer is option A.
Question 2
1 / -0

During the meiotic division, the

A
Homologous chromosomes are separated

B
Linkage is disturbed

C
Homologous chromosomes do not segregate

D
All of the above

Solution

In meiotic division, the homologous chromosomes are separated in anaphase I of meiosis I.
Question 3
1 / -0

How many cells are required for obtaining 16 haploid cells ?

A
2

B
4

C
16

D
1

Solution

One meiotic cell division gives 4 haploid cells. Thus, 4 meiotic cell division will give 16 cells.
Question 4
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The spindle fibre is made up of

A
Tubulin

B
Humulin

C
Intermediate filament

D
Flagellin

Solution

The mitotic spindle is a highly dynamic molecular machine composed of tubulin, motors, and other molecules. It assembles around the chromosomes and distributes the duplicated genome to the daughter cells during mitosis.
Tubulin is the protein, which makes up microtubules. Microtubules are assembled from dimers of α- and β-tubulin. Each of these subunits has three domains. γ-tubulin is important in the nucleation and polar orientation of microtubule.
Humulin - used for a preparation of insulin produced by genetic engineering and structurally identical to insulin made by the human pancreas.
Intermediate filaments (IFs) are cytoskeletal components found in the cells of many animal species. They are composed of a family of related proteins sharing common structural and sequence features.
Flagellin is a globular protein that arranges itself in a hollow cylinder to form the filament in a bacterial flagellum.
Flagellin is the principal substituent of bacterial flagellum, and is present in large amounts on nearly all flagellated bacteria.
So, the correct answer is option A.
Question 5
1 / -0

There are 42 chromosomes in a cell. After a particular phase of mitosis, the number of chromosomes remain same. Name the phase.
I. Anaphase
II. Metaphase
III. Prophase
IV. Telophase

A
I and IV

B
II and III

C
II and IV

D
I, II, and III

E
I, II and IV

Solution

Anaphase of mitosis is marked by splitting of centromere and separation and movement of sister chromatids towards the opposite poles. Splitting of centromere, will cause doubling of the number of chromosomes from 42 to 84 by the end of anaphase. Likewise, telophase of mitosis is marked by the formation of the nuclear membrane around sister chromatids (now called as chromosomes) present at opposite poles. Hence, telophase ends with reducing the number of chromosomes from 42 to 21 in the cell. Metaphase includes movement and arrangement of sister chromatids on the cell’s equator while prophase is marked by the appearance of chromosomes with sister chromatids due to condensation of the chromatin fibre. Hence, metaphase and prophase cell will maintain the same chromosome number i.e., 42.
So, the correct answer is known as option B.
Question 6
1 / -0

The presence of checkpoint during mitosis ensures the attachment of all chromosomal kinetochore proteins to the spindle fibres. The absence of attachment of kinetochore proteins produces a signal preventing mitosis to proceed to next stage. The occurrence of this check point is responsible for transition from

A
Anaphase to telophase

B
Prophase to metaphase

C
Metaphase to telophase

D
Prophase to anaphase

E
Metaphase to anaphase

Solution

The attachment of all chromosomal kinetochore proteins to the spindle fibres to facilitate their arrangement on cell's equator takes place during mitosis. The failure of this process signal the checkpoint to prevent the transition of metaphase into anaphase as metaphase of mitosis is followed by anaphase.
So, the correct answer is option E.
Question 7
1 / -0

Skeletal muscle performs many functions in the body, including locomotion, support, and heat generation. Unlike most cells in the human body, skeletal muscle cells are multinucleate (having more than one nucleus per cell).
Which statement describes a circumstance that would produce a mature cell that has more than one nucleus?

A
Cytokinesis happens more often than mitosis

B
Mitosis happens more often than cytokinesis

C
Meiosis causes nuclear fission

D
Meiosis produces four daughter cells

Solution

A mature cell that has more than one nucleus, share common cytoplasm with another cells. Mitosis results in the equational nuclear division. If Mitosis is not followed by cytokinesis then a mature multinucleated cell is produced.
So the correct answer is 'Mitosis happens more often than cytokinesis'.
Question 8
1 / -0

The number of chromosomes in a somatic cell, of a diploid organism (with original of 10 pairs), after DNA replication and before mitosis would be

A
$$10$$

B
$$20$$

C
$$30$$

D
$$40$$

E
$$50$$

Solution

The somatic cell has 20 chromosomes (10 pairs). DNA replication doubles the DNA content which is accommodated in two chromatids of each chromosome. The total number of chromosomes remains same. So, the given cell with 20 chromosomes will have the same number of chromosomes after DNA replication and before mitosis. So, the correct answer is B.
Question 9
1 / -0

Which phase of mitosis is responsible for uncoiling of chromosomes followed by nuclear membrane formation?

A
Interphase

B
Prophase

C
Metaphase

D
Anaphase

E
Telophase

Solution

During prophase, the nucleus disappears, spindle fibers form, and DNA condenses into chromosomes (sister chromatids). During metaphase, the sister chromatids align along the equator of the cell by attaching their centromeres to the spindle fibers. During anaphase, sister chromatids are separated at the centromere and are pulled towards opposite poles of the cell by the mitotic spindle. During telophase, chromosomes arrive at opposite poles and unwind (uncoil) into thin strands of DNA, the spindle fibers disappear, and the nuclear membrane reappears. Cytokinesis is the actual splitting of the cell membrane, which takes place by furrow formation in animal cell while plant cells form a cell plate that becomes the new cell wall. Cells enter the G$$_0$$ (inactive) phase after they exit the cell cycle when they are not actively preparing to divide.Some cells remain in G$$_0$$ phase permanently.
Question 10
1 / -0

All of the following statements regarding mitosis is incorrect except

A
Mitosis will result in reductional division

B
Sister chromatids will separate during metaphase

C
Cytokinesis occurs during the process of prophase

D
Mitosis occurs continually in the life cycle of only somatic cells

E
The final product of mitosis is the formation of two identical cells with identical nuclei

Solution

Mitosis is a cell division which takes place in the somatic cell. It begins with diploid parent cell and ends up with diploid daughter cell. It is also known as equational division.
So, the correct answer is option E.

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Cell Cycle and Cell Division Test - 83

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Question 1

Decondensation from chromosome and reassembly of the nuclear lamina

Transcription from chromosome and reassembly of the nuclear lamina

Formation of the contractile ring and formation of the phragmoplast

Formation of the contractile ring and transcription from chromosomes

Solution

Question 2

Homologous chromosomes are separated

Linkage is disturbed

Homologous chromosomes do not segregate

All of the above

Solution

Question 3

2

4

16

1

Solution

Question 4

Tubulin

Humulin

Intermediate filament

Flagellin

Solution

Question 5

I and IV

II and III

II and IV

I, II, and III

I, II and IV

Solution

Question 6

Anaphase to telophase

Prophase to metaphase

Metaphase to telophase

Prophase to anaphase

Metaphase to anaphase

Solution

Question 7

Cytokinesis happens more often than mitosis

Mitosis happens more often than cytokinesis

Meiosis causes nuclear fission

Meiosis produces four daughter cells

Solution

Question 8

$$10$$

$$20$$

$$30$$

$$40$$

$$50$$

Solution

Question 9

Interphase

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 10

Mitosis will result in reductional division

Sister chromatids will separate during metaphase

Cytokinesis occurs during the process of prophase

Mitosis occurs continually in the life cycle of only somatic cells

The final product of mitosis is the formation of two identical cells with identical nuclei

Solution

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