Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 56

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Weekly Quiz Competition

Question 1
1 / -0

Some cells in the adult animal do not divide. They exit $$G_1$$ phase and enter an inactive stage which is called as

A
$$G_2$$ phase

B
$$G_0$$ phase

C
S-phase

D
M-phase

Solution

The G0 phase is a period in the cell cycle in which cells exist in a quiescent state. G0 phase viewed as either an extended G1 phase, where the cell is neither dividing nor preparing to divide, or a distinct quiescent stage that occurs outside of the cell cycle.

So, the correct answer is 'B'.
Question 2
1 / -0

The undifferentiated cell of an animal has 64 chromatids in a metaphase . How many chromosomes will be present in the gametes if that animal

A
$$16$$

B
$$8$$

C
$$64$$

D
$$32$$

Solution

Answer is option A i.e. "16"
Metaphase is the third stage of mitosis. Single chromosome constitutes of 2 chromatids which are attached to each other by 1 centromere. Hence, 1 homologous chromosome pair has 4 chromatids. As chromosomes in animals are paired, as they are diploid and contains two sets of chromosomes, so formula becomes:
Chromosomes in gametes = No. of chromatids in a metaphase/4 = 64/4 = 16.
Question 3
1 / -0

Tetratype is

A
Cell with tetrad stage

B
Tetrads having $$50\%$$ parental and $$50\%$$ recombinants

C
Tetrads with only parental types

D
Tetrads with no parental types

Solution

Tetratype is a tetrad containing four different genotypes, two parental and two recombinant.

So, the correct answer is 'Cell with tetrad stage'.
Question 4
1 / -0

In the meiotic process, metaphase I differs significantly from metaphase II by the ___________________.

A
Arrangement of chromosomes at equatorial plane

B
Lack of centromeric division

C
Orientation towards opposite poles

D
Attachment of spindle fibers to the centromeric positions
Question 5
1 / -0

In meiosis, the daughter chromatids segregate form each other at ______________.

A
Anaphase-I

B
Anaphase-II

C
Partially at anaphase-I and partially at anaphase-II

D
Duskinass

Solution

In anaphase I, the homologues are pulled apart and move apart to opposite ends of the cell. The sister chromatids of each chromosome, however, remain attached to one another and don't come apart.
Anaphase II is the stage when sister chromatids of every chromosome separate and begin to move towards the opposite ends of the cell. The separation and the movement is due to the shortening of the kinetochore microtubules.
So, the correct option is 'B'.
Question 6
1 / -0

Number of bivalent are 8 in prophase I. What is the number of chromosomes during anaphase II ?

A
8

B
4

C
16

D
32

Solution

In prophase I homologous chromosome get attached (synapse) along with their lengths and exchange DNA. They are called bivalents or tetrads. In anaphase I, there is the separation of the chromosomes towards the poles without breaking at the centromeres. During anaphase II, the sister chromatids of each chromosome separate and move towards the opposite poles. Each chromatid is called the daughter chromosome. The number of chromosomes in anaphase II will be halved.
Thus, the correct answer is option B.
Question 7
1 / -0

In cell division, kinetochore helps in _________________.

A
The formation chromosomal complex

B
Condensing the chromatin

C
Attaching chromosome with spindle fibers

D
Cytokinesis
Question 8
1 / -0

Absence of sexual union and failure of meiosis is called _____________.

A
Anisospory

B
Amphimixis

C
Apomixis

D
Anisogamety

Solution

Cell division is a process of forming of new cells eventually giving rise to organ systems A cell divides by the process of mitosis and meIOSIS. to produce four daughter cells each having half the amount of DNA as the parent cell. Meiosis occurs in two phases Meiosis I and Meiosis II.

- Amphimixis: It is a type of sexual reproduction. It involves the fusion of male and female gametes which leads to the formation of the zygote. In plants, amphimixis leads to the formation of a fertilized egg.

-Anisogamy: It is a type of sexual reproduction in which both the male and female gametes are of different sizes and forms. Their fusion leads to the production of a new generation. The smaller gamete is considered as a male gamete and the larger gamete is considered as a female gamete. The gametes are flagellated and motile.

-Anisospory : It is usually seen in bryophytes. When sporangium undergoes meiotic division it results in the production of different sizes of spores. The tetrad formed consist of two small spores which produce male gametophyte and two large spores which produce female gametophyte.

-Apomixis: It is a type of asexual reproduction. In this, there is an absence of fusion of the gametes but the fertilization of the egg takes place. Or we can say that embryos are formed without the need for fertilization and meiosis.
So, the correct option is 'A'.
Question 9
1 / -0

The mitotic cycle is initiated by the activation of ______________.

A
Tubulin protein

B
Kinetochore protein

C
MPF-protein kinase

D
RNA polymerase

Solution

Cell division occurs in defined stages, which together comprise the cell cycle. There are two types of cell division: Meiosis and Mitosis.
MEIOSIS: Occurs during formation of the gametes, the number of chromosomes reduced to half in reproductive cell
MITOSIS: Mitosis is the process in which a eukaryotic cell nucleus splits in two, followed by division of the parent cell into two daughter cells.
MPF- protein kinase promotes the entrance into mitosis (the M phase) from the G2 phase by phosphorylating multiple proteins needed during mitosis. . The MPF is also called the M phase kinase because of its ability to phosphorylate target proteins at a specific point in the cell cycle and thus control their ability to function.
So, the correct option is 'C'.
Question 10
1 / -0

Which one of the following statements about meiosis in plants is NOT correct?

A
The cytomictic channels in the medicates of higher plants permit passage of a number of cytoplasm components from on cell to the other to maintain the meiotic synchrony

B
There is a conspicuous reappearance of a large proportion of ribosome population during zymogene in the meiocyte

C
During early prophase, the chromosomes condense a clump onto one part of nuclear envelop to constitute the so-called synizesis stage

D
Synaptonemal complex of zygogene is the structure responsible for chromosomal alignment and parining

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Cell Cycle and Cell Division Test - 56

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Cell Cycle and Cell Division Test - 56

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Question 1

$$G_2$$ phase

$$G_0$$ phase

S-phase

M-phase

Solution

Question 2

$$16$$

$$8$$

$$64$$

$$32$$

Solution

Question 3

Cell with tetrad stage

Tetrads having $$50\%$$ parental and $$50\%$$ recombinants

Tetrads with only parental types

Tetrads with no parental types

Solution

Question 4

Arrangement of chromosomes at equatorial plane

Lack of centromeric division

Orientation towards opposite poles

Attachment of spindle fibers to the centromeric positions

Question 5

Anaphase-I

Anaphase-II

Partially at anaphase-I and partially at anaphase-II

Duskinass

Solution

Question 6

8

4

16

32

Solution

Question 7

The formation chromosomal complex

Condensing the chromatin

Attaching chromosome with spindle fibers

Cytokinesis

Question 8

Anisospory

Amphimixis

Apomixis

Anisogamety

Solution

Question 9

Tubulin protein

Kinetochore protein

MPF-protein kinase

RNA polymerase

Solution

Question 10

The cytomictic channels in the medicates of higher plants permit passage of a number of cytoplasm components from on cell to the other to maintain the meiotic synchrony

There is a conspicuous reappearance of a large proportion of ribosome population during zymogene in the meiocyte

During early prophase, the chromosomes condense a clump onto one part of nuclear envelop to constitute the so-called synizesis stage

Synaptonemal complex of zygogene is the structure responsible for chromosomal alignment and parining

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