Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 85

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Weekly Quiz Competition

Question 1
1 / -0

The correct sequence of different phases of mitosis is

A
Anaphase $$\rightarrow$$ Metaphase $$\rightarrow$$ Prophase $$\rightarrow$$Telophase $$\rightarrow$$Interphase

B
Interphase $$\rightarrow$$ Telophase $$\rightarrow$$ Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Prophase

C
Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Telophase $$\rightarrow$$ Prophase

D
Interphase $$\rightarrow$$ Prophase $$\rightarrow$$ Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Telophase

Solution

Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase. These phases occur in this strict sequential order, and cytokinesis - the process of dividing the cell contents to make two new cells - starts in anaphase or telophase. The mitotic phase is a relatively short period of the cell cycle. It alternates with the much longer interphase, where the cell prepares itself for the process of cell division. Interphase is divided into three phases: G1 (first gap), S (synthesis), and G2 (second gap). Hence the correct answer is option D.
Question 2
1 / -0

Congression occurs during

A
Early prophase

B
Late prophase

C
Early metaphase

D
Late metaphase

Solution

A. In early prophase, chromatin fibres thicken and shorten and form long chromosomes. Also, sister chromatids are intertwined.
B. In the late prophase, chromosomes are randomly distributed in cytoplasm of the cell.
C. In the early metaphase, contraction of chromosomal spindle fibres takes place. Hence chromosomes come together over the equator of the spindle to form the metaphase plate. This is called congression.
D. In the late metaphase, the formation of the equatorial plate or the metaphasic plate takes place.
So, the correct answer is 'Early metaphase'.
Question 3
1 / -0

An egg cell has 5 picogram of genetic material in its nucleus. What amount of material will be present in the organism at the end of $$G_2$$-phase of mitosis?

A
5 gm

B
5 picogram

C
10 picogram

D
20 picogram

Solution

The egg is haploid and contains 5 picogram of genetic material. It's an animal which must be diploid contains 10 picogram of genetic material. In S phase, the genetic material becomes double, therefore the amount of genetic material in $$G_2$$ phase will be 20 picogram.
Question 4
1 / -0

Best stage to observe shape, size and number of chromosomes is

A
Interphase

B
Metaphase

C
Prophase

D
Telophase

Solution
Mitosis is divided into the following four stages. They are prophase, metaphase, anaphase and telophase.
The complete disintegration of the nuclear envelope marks the start of the metaphase (second phase of mitosis).
Best stage to observe shape, size and number of chromosomes are metaphase because, by this stage, condensation of chromosomes is completed and they can be observed clearly under the microscope.
So, the correct answer is 'Metaphase'.

Question 5

1 / -0

Shape of chromosome can be best observed during

Prophase

Metaphase

Anaphase

Telophase

Solution

A) In prophase, chromosomes are not clearly visible because the sister chromatids are intertwined with each other. The chromosomes overlap one another and appear like a ball of wool, thus, the ends of the chromosomes are not clear.

B) During metaphase, the chromosomes are condensed. Hence, the centromere and the arms of the chromatids are distinct and clearly visible. Due to this, metaphase is best stage to view the shape, size and number of chromosomes.

C) In telophase, the chromosomes undergo elongation and they are at the poles and are diffused in the form of loosely arranged chromatin material. This diffused chromatin material do not show distinct centromeres and chromatids.

D) In interphase, though the duplication of chromatin material takes place, the chromatin material is not condensed to form chromosomes. Hence, chromosomes do not show distinct centromeres and chromatids.

So, the correct answer is 'Metaphase'.

Question 6

1 / -0

Nuclear spindle has .......... types of fibres

One

Two

Three

Four

Solution

Nuclear spindle has three types of spindle fibres. They are:
1) Continuous fibre (run from pole to pole).
2) Discontinuous fibre (run between pole to centromeres).
3) Interzonal fibre (run between 2 centromere).

So, the correct answer is 'Nuclear spindle has three types of fibres'.

Question 7

1 / -0

In metaphase of mitosis, the chromosomes

Break and disintegrate

Undergo condensation

Line up at equator

Decondense and elongate

Solution

In metaphase of mitosis, chromosomes are connected by chromosomal spindle fibres at the centromere region. These fibres contracts, leads to organisation of chromosomes along the equator of the spindle. Hence chromosome line up at equator.

So, the correct answer is 'In metaphase of mitosis, the chromosomes line up at equator'.

Question 8

1 / -0

Identify the correct stage of cell division and its characteristics.

Telophase - Endoplasmic reticulum and nucleolus not reformed

Telophase - Nuclear envelop reforms, Golgi complex reforms

Late Anaphase - Chromosomes move away from equatorial plate, Golgi complex not present

Cytokinesis - Cell plate formed, mitochondria distributed between two daughter cells

Solution

Question 9

1 / -0

During cell cycle, RNA and proteins are synthesised in

$$S- phase$$

$$G_1- phase$$

$$G_2-phase$$

Both B and C

Solution

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.

Gap 1 (G1): Cells increase in size in Gap 1, produce RNA and synthesize protein.

Gap 2 (G2): During the gap between DNA synthesis and mitosis, the cell will continue to grow and produce new proteins.

Hence answer is 'Both B and C'

Question 10

1 / -0

Brachymeiois consists of _________.

Two reduction divisions and one equational division

One reduction division and one equational division

One reduction division and two equational divisions

Two reduction divisions and two equational divisions

Solution

Brachymeiosis is a type of meiosis which is seen in ascomycetes. It includes an extra nuclear fusion. It is consists of three division, two are reductional division (meiosis) and one is equational division (mitosis).

Hence, the correct answer is option A, i.e., Two reduction divisions and one equational division.

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Cell Cycle and Cell Division Test - 85

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Cell Cycle and Cell Division Test - 85

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Question 1

Anaphase $$\rightarrow$$ Metaphase $$\rightarrow$$ Prophase $$\rightarrow$$Telophase $$\rightarrow$$Interphase

Interphase $$\rightarrow$$ Telophase $$\rightarrow$$ Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Prophase

Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Telophase $$\rightarrow$$ Prophase

Interphase $$\rightarrow$$ Prophase $$\rightarrow$$ Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Telophase

Solution

Question 2

Early prophase

Late prophase

Early metaphase

Late metaphase

Solution

Question 3

5 gm

5 picogram

10 picogram

20 picogram

Solution

Question 4

Interphase

Metaphase

Prophase

Telophase

Solution

Question 5

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 6

One

Two

Three

Four

Solution

Question 7

Break and disintegrate

Undergo condensation

Line up at equator

Decondense and elongate

Solution

Question 8

Telophase - Endoplasmic reticulum and nucleolus not reformed

Telophase - Nuclear envelop reforms, Golgi complex reforms

Late Anaphase - Chromosomes move away from equatorial plate, Golgi complex not present

Cytokinesis - Cell plate formed, mitochondria distributed between two daughter cells

Solution

Question 9

$$S- phase$$

$$G_1- phase$$

$$G_2-phase$$

Both B and C

Solution

Question 10

Two reduction divisions and one equational division

One reduction division and one equational division

One reduction division and two equational divisions

Two reduction divisions and two equational divisions

Solution

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