Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

When a cell stops growing say due to shortage of nutrients, this will occur in which phase of the cell cycle?

A
$$G_1\quad phase$$

B
$$S \quad phase$$

C
$$G_2\quad phase$$

D
$$M \quad phase$$

Solution

The G$$_0$$ phase is a period in the cell cycle in which cells exist in a quiescent state. G$$_0$$ phase is viewed as either an extended G$$_1$$ phase, where the cell is neither dividing nor preparing to divide, or a distinct quiescent stage that occurs outside of the cell cycle. Due to shortage of nutrients, cell does not enter 'S' phase after G$$_1$$ and cell division does not take place.
So, the correct option is 'G$$_1$$ phase'.
Question 2
1 / -0

Regarding Meiosis

A
Occurs in reproductive cells

B
Maintain haploid number of chromosomes

C
Genetic variation occurs

D
Occurs in all sextual reproduction

Solution

Meiosis is the process by which gametes are formed resulting in haploid set of chromosomes within them. It occurs in germ cells which results in the production of gametes. Meiosis involves the pairing of homologous chromosomes and recombination which produces genetic variations. Though, diploidy of chromosomes is restored after fertilisation in diploid organisms. Meiosis maintains haploid number of chromosomes only in organisms with haplontic life cycle as meiosis diploid zygote undergoes meiosis in such organisms.
So, the correct option is 'Maintain haploid number of chromosomes'.
Question 3
1 / -0

Identify the following figure of cell cycle:-

A
Anaphase I

B
Metaphase I

C
Anaphase II

D
Telophase II

Solution

During anaphase II, the third step of meiosis II, the sister chromatids of each chromosome separate and move toward opposite poles. Once they are no longer connected, the former chromatids are called unreplicated chromosomes.
Correct option is C, Anaphase II
Question 4
1 / -0

The genomic DNA is duplicated during

A
S - Phase

B
$$G_1 - phase$$

C
$$G_0 - phase$$

D
all phases

Solution

In the eukaryotic cell cycle, chromosome duplication occurs during "S phase" (the phase of DNA synthesis) and chromosome segregation occurs during "M phase" (the mitosis phase).
Hence the correct answer (A)
Question 5
1 / -0

At what point does the secondary oocyte complete meiosis?

A
When acrosomal enzymes begin to break down the egg's jelly coat.

B
When the luteinizing hormone triggers ovulation.

C
After it is penetrated by a sperm cell.

D
When the secondary oocyte implants in the endometrium of the uterus.
Question 6
1 / -0

Which specific protein is formed in $$G_2 -phase$$?

A
$$Histone$$

B
$$DNA-polymerase$$

C
Scaffold proteins

D
$$Tubulin$$
Question 7
1 / -0

In meiosis ,replication of DNA occurs in

A
Mesiosis I

B
Meiosis II

C
Between meiosis II and Meiosis I

D
Both meiosis I and Meiosis II

Solution

Meiosis is the form of eukaryotic cell division that produces haploid sex cells or gametes (which contain a single copy of each chromosome) from diploid cells (which contain two copies of each chromosome). DNA replication takes place in S-phase of the Interphase before Meiosis I begins.
Question 8
1 / -0

In which phase does the spindle fiber disappear

A
Prophase

B
Metaphase

C
Anaphase

D
Telophase

Solution

In telophase when the two nuclei start forming, the spindle fibres disappear and also the nuclear membrane and the nucleolus reappear. So, the correct option is "Telophase".
Question 9
1 / -0

How many meiosis are reqiuired to make 200 male gametes?

A
25

B
50

C
75

D
80

Solution

One meiotic division produces 4 male gametes, so for the formation of 200 male gametes 50 meiotic divisions are required.
Hence the correct answer is (B)
Question 10
1 / -0

Non - disjunction in meiosis results in:

A
Trisomy

B
Normal diploid

C
Gene mutation

D
None

Solution

The majority of cases results from nondisjunction during maternal meiosis I. Trisomy occurs in at least 0.3% of newborns and in nearly 25% of spontaneous abortions. It is the leading cause of pregnancy wastage and is the most common known cause of mental retardation.

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Re-Attempt Weekly Quiz Competition

Cell Cycle and Cell Division Test - 72

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Cell Cycle and Cell Division Test - 72

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Question 1

$$G_1\quad phase$$

$$S \quad phase$$

$$G_2\quad phase$$

$$M \quad phase$$

Solution

Question 2

Occurs in reproductive cells

Maintain haploid number of chromosomes

Genetic variation occurs

Occurs in all sextual reproduction

Solution

Question 3

Anaphase I

Metaphase I

Anaphase II

Telophase II

Solution

Question 4

S - Phase

$$G_1 - phase$$

$$G_0 - phase$$

all phases

Solution

Question 5

When acrosomal enzymes begin to break down the egg's jelly coat.

When the luteinizing hormone triggers ovulation.

After it is penetrated by a sperm cell.

When the secondary oocyte implants in the endometrium of the uterus.

Question 6

$$Histone$$

$$DNA-polymerase$$

Scaffold proteins

$$Tubulin$$

Question 7

Mesiosis I

Meiosis II

Between meiosis II and Meiosis I

Both meiosis I and Meiosis II

Solution

Question 8

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 9

25

50

75

80

Solution

Question 10

Trisomy

Normal diploid

Gene mutation

None

Solution

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