Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 75

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Weekly Quiz Competition

Question 1
1 / -0

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

A
Transcription from chromosomes and reassembly of the nuclear lamina

B
Formation of the contractile ring and formations of the phragmoplast

C
Formation of the contractile ring and transcription from chromosomes

D
De-condensation from chromosomes and reassembly of the nuclear lamina
Question 2
1 / -0

Maximum cytoplasmic growth and duplication of semi-autonomous organelles occur in ___________________.

A
$$G_1\, and \, G_2$$ respectively

B
$$ G_2$$ and M-phase respectively

C
$$G_1$$ only

D
$$G_2$$ only

Solution

$$G_2$$ only(Ans)
Organelle replication, occurs during the $$G_2$$ stage of the cell cycle. During this stage, organelles are replicated and proteins are synthesised, it follows DNA replication which occurs during the S-phase. It is also characterised by cytoplasmic growth where as in $$G_1$$ phase, cell normally grows and carries out normal metabolism.
Question 3
1 / -0

Which of the following structures are not observed in a cell at the end of prophase, when viewed under the microscope?

A
Golgi complex

B
Nucleolus

C
Nuclear envelope

D
All of the above

Solution

Prophase is the first stage of mitosis. So, initiation of the assembly of mitotic spindle, the microtubules, the proteinaceous components of the cell cytoplasm help in tje the process. So, at the end of prophase under microscope do not show golgi complex,endoplasmic reticulum, nucleolus and nuclear envelope because they are undifferentiated.
Question 4
1 / -0

During metaphase chromosomes ............

A
Become short and thick

B
Get arranged at the equator

C
Duplicate and divide

D
Move to the respective poles

Solution

During metaphase, the mitotic spindle is fully developed, centrosomes are at opposite poles of the cell, and chromosomes are lined up at the metaphase plate (equatorial region).
So, the correct answer is option B.
Question 5
1 / -0

Number of spindle apparatus formed during meiosis is?

A
$$3$$

B
$$2$$

C
$$1$$

D
$$4$$$

Solution

In cell biology, the spindle apparatus refers to the cytoskeletal structure of eukaryotic cells that forms during cell division to separate sister chromatids between daughter cells.
In meiosis 2 spindle apparatus are formed ( 1 in meiosis-I and 1 in meiosis II).
So the correct answer is option B.
Question 6
1 / -0

In a mammalian cell the longest and the most active phase of the cell cycle is :

A
$$S phase$$

B
$$G_1 $$ Phase

C
$$G_2$$ Phase

D
None of these

Solution

S phase is the synthesis phase in which the DNA gets replicated. It is the longest and active phase of the cell cycle and it takes nearly 80 minutes of the whole 150 minutes cell cycle process.
Question 7
1 / -0

Spindle fibres are attached to kinetochores of chromosomes in?

A
Metaphase

B
Anaphase

C
Telophase

D
$$1$$ and $$2$$

Solution

In prophase, the nucleolus disappears and chromosomes condense and become visible.
In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores.
In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber.
Therefore, the correct answer is (A).
Question 8
1 / -0

From a culture of mammalian cells, a cell in M phase is made to fuse with a second cell in G1 phase. The second cell go into _____________.

A
S phase instantly

B
M phase skipping S phase

C
M phase after quickly completing S phase

D
G2 phase after completing S phase

Solution

$$\rightarrow$$ S phase instantly
$$\Rightarrow$$ In S-phase(synthetic phase) the chromosomes replicate. For this their DNA molecules function as templates and form carbon copies.
$$\bullet$$ The DNA content doubles i.e., $$1$$C to $$2$$C for haploid cells and $$2$$C to $$4$$C for diploid cells.
$$\bullet$$ S-phase is also called invisible phase of M-stage since it is in this phase that chromosome prepare themselves for equitable distribution later on.
Question 9
1 / -0

Separation of chromosome with associated chromatid at centromere occurs in?

A
Anaphase

B
Anaphase I

C
Anaphase II

D
Anaphase and Anaphase I

Solution

i) During anaphase 1, homologous chromosomes are pulled towards the opposite poles by the shortening of kinetochore microtubules.
ii) The non-kinetochore microtubules are lengthened in order to push the chromosomes further apart.
iii) Homologous chromosomes are separated from the cohesin at the arms of the chromosomes.
iv) Each separated bivalent chromosome starts moving towards the opposite poles due to the tension generated by the microtubules.
v) Anaphase 1 is followed by telophase 1 where the bivalent chromosomes arrive at the opposite poles.

Therefore the correct answer is option B. Anaphase 1.
Question 10
1 / -0

How many times a cell will have no divide mitotically, to form $$128$$ cells?

A
$$7$$

B
$$14$$

C
$$28$$

D
$$32$$

Solution

Answer :
i) Mitosis is an equational division process and it produces two daughter cells from the single parent cells.
ii) Clearly, the formula (2)^n would answer the number of cells produced, where n would be the number of divisions.
(2)^n = 128
(2)^n = (2)^7, Therefore, n=7.
iii) It will take 7 divisions to produce 128 cells from a singe cell by mitosis.
So correct answer is option A. 7.

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Re-Attempt Weekly Quiz Competition

Cell Cycle and Cell Division Test - 75

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Cell Cycle and Cell Division Test - 75

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Question 1

Transcription from chromosomes and reassembly of the nuclear lamina

Formation of the contractile ring and formations of the phragmoplast

Formation of the contractile ring and transcription from chromosomes

De-condensation from chromosomes and reassembly of the nuclear lamina

Question 2

$$G_1\, and \, G_2$$ respectively

$$ G_2$$ and M-phase respectively

$$G_1$$ only

$$G_2$$ only

Solution

Question 3

Golgi complex

Nucleolus

Nuclear envelope

All of the above

Solution

Question 4

Become short and thick

Get arranged at the equator

Duplicate and divide

Move to the respective poles

Solution

Question 5

$$3$$

$$2$$

$$1$$

$$4$$$

Solution

Question 6

$$S phase$$

$$G_1 $$ Phase

$$G_2$$ Phase

None of these

Solution

Question 7

Metaphase

Anaphase

Telophase

$$1$$ and $$2$$

Solution

Question 8

S phase instantly

M phase skipping S phase

M phase after quickly completing S phase

G2 phase after completing S phase

Solution

Question 9

Anaphase

Anaphase I

Anaphase II

Anaphase and Anaphase I

Solution

Question 10

$$7$$

$$14$$

$$28$$

$$32$$

Solution

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