Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

A
M

B
Both G$$_2$$ M and M

C
G$$_1$$/S

D
G$$_2$$ /M

Solution

When the DNA replication in the S-phase is stalled, the DNA replication and synthesis is not complete. This causes the activation of the G$$_2$$/M checkpoint which does not allow the cell to enter the G$$_2$$ and the M phase till the replication is complete.
So, the correct answer is $$G_2$$/M.
Question 2
1 / -0

Identify the correct statement with regard to $$G_1$$ phase (Gap 1) of interphase.

A
Reorganisation of all cell components takes place.

B
Cell is metabolically active, grows but does not replicate its DNA.

C
Nuclear Division takes place.

D
DNA synthesis or replication takes place.

Solution

The $$G_1$$ phase of interphase includes synthesis of various proteins, duplication of organelles, synthesis of various enzymes etc as a preparation for the synthesis phase and cell division. Therefore, it is metabolically very active but DNA replication does not take place in this phase, it occurs in the S phase of interphase.
So, the correct answer is 'Cell is metabolically active, grows but does not replicate its DNA.'
Question 3
1 / -0

Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

A
Recombination of chromosome arms will occur.

B
Chromosomes will not condense.

C
Chromosomes will be fragmented.

D
Chromosomes will not segregate.

Solution

Anaphase promoting complex helps in the transition of the chromosome from metaphase to anaphase. The APC attaches to the chromosomes aligned at the equator during metaphase and allows the segregation of the chromatids.
So, the correct answer is option D.
Question 4
1 / -0

Primary source of allelic variation is

A
Independent assortment

B
Recombination

C
Mutation

D
Polyploidy
Question 5
1 / -0

The G$$_{2}$$ phase of the cell cycle is signified by the synthesis of

A
mRNA only

B
rRNA only

C
rRNA and mRNA

D
DNA

Solution

The G$$_2$$ phase is the third phase of the cell cycle; the first two being the G$$_1$$ phase and the S phase. In the S phase, the DNA has been replicated and now in G$$_2$$ phase, the cell grows and prepares itself for mitosis. To do so, it requires proteins (for example, for spindle assembly and dis-assembly). Hence, this phase is marked by protein synthesis and rapid cell growth. As it involves protein synthesis, both mRNA (required to translate into protein) and rRNA ( an essential component for protein synthesis) will be synthesized.
So, the correct answer is option C.
Question 6
1 / -0

Which of the following is not a characteristic of meiosis?

A
It involves two stages of DNA replication one before meiosis I and another before meiosis II.

B
It involves recombination and crossing over.

C
Sister chromatids separate during anaphase II.

D
Nuclear membrane disappears during prophase.

Solution

DNA replication occurs once but meiosis has two M-phases each with its own karyokinesis and cytokinesis. As a result chromosome number is halved. The transition period between M-phase I (meiosis I) and M-phase II (meiosis II) is short and without DNA replication. It is called interkinesis.
So, the correct answer is option A.
Question 7
1 / -0

Which phenomenon takes place at G$$_{1}$$ stage?

A
DNA synthesis

B
RNA synthesis

C
Reverse transcription

D
All of the above

Solution

The first growth phase or G$$_1$$phase is the longest phase of cell cycle. There is a synthesis of biochemicals like RNA, proteins, enzymes for DNA synthesis, amino acids for histone formation, nucleotides and ATP.
So, the correct answer is option B.
Question 8
1 / -0

In which of the following stages, chromosomes are attached on equatorial plane?

A
Metaphase

B
Anaphase

C
Telophase

D
None of the above.
Question 9
1 / -0

Crossing over is advantageous because it brings about

A
Variation

B
Linkage

C
Inbreeding

D
Stability

Solution

Meiosis is the type of cell division in which homologous chromosomes separate after exchange of fragments. As a result, of meiosis four haploid cells are produced which are all genetically different from each other. This is due to the process of crossing over or exchange of segments between homologous chromosomes.
Question 10
1 / -0

Diploid cells have

A
Two chromosomes

B
One set of chromosomes

C
Two pairs of chromosomes

D
Two sets of chromosomes

Solution

Diploid cells have two sets of chromosomes one inherited from a female parent and one inherited from a male parent. This chromosomal constitution is designated 2n, where n denotes basic haploid chromosome set.
So, the correct answer is option D.

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Cell Cycle and Cell Division Test - 10

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Cell Cycle and Cell Division Test - 10

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Question 1

M

Both G$$_2$$ M and M

G$$_1$$/S

G$$_2$$ /M

Solution

Question 2

Reorganisation of all cell components takes place.

Cell is metabolically active, grows but does not replicate its DNA.

Nuclear Division takes place.

DNA synthesis or replication takes place.

Solution

Question 3

Recombination of chromosome arms will occur.

Chromosomes will not condense.

Chromosomes will be fragmented.

Chromosomes will not segregate.

Solution

Question 4

Independent assortment

Recombination

Mutation

Polyploidy

Question 5

mRNA only

rRNA only

rRNA and mRNA

DNA

Solution

Question 6

It involves two stages of DNA replication one before meiosis I and another before meiosis II.

It involves recombination and crossing over.

Sister chromatids separate during anaphase II.

Nuclear membrane disappears during prophase.

Solution

Question 7

DNA synthesis

RNA synthesis

Reverse transcription

All of the above

Solution

Question 8

Metaphase

Anaphase

Telophase

None of the above.

Question 9

Variation

Linkage

Inbreeding

Stability

Solution

Question 10

Two chromosomes

One set of chromosomes

Two pairs of chromosomes

Two sets of chromosomes

Solution

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