Two key events take place during S phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell do events occur?

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Solution

DNA replication

The replication of DNA, a characteristic of the S phase of cell cycle, occurs in the nucleus. This is because DNA resides in the nucleus.

Centriole duplication

The S phase is also characterised by the duplication of centrioles. This occurs in the cytoplasm.

Final answer: Nucleus and cytoplasm respectively.

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Question 34
Two key events take place, during S-phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell there events occur?

Q. Match the following events that occur in their respective phases of cell cycle and select the correct option:

Column - I	Column - II
(a)	$G_{1}$ phase	(i)	Cell grows and organelle duplication
(b)	S phase	(ii)	DNA replication and chromosome duplication
(c)	$G_{2}$ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in M-phase	(iv)	Alignment of M-phase chromosomes

Question 30.1
The following events occur during the various phases of the cell cycle. Name the phase against each of the events.
Disintegration of nuclear membrane

The following events occur during the various phases of the cell cycle. Name the phase against each of the events.
Appearance of nucleolus

The following events occur during the various phases of the cell cycle. Name the phase against each of the events.
Division of centromere

The following events occur during the various phases of the cell cycle. Name the phase against each of the events.
Replication of DNA

Q. Which of the following sequence of events occur after DNA replication during cell cycle?

I. Nuclear membrane dissolves.
II. Cell size increases.
III. Two daughter cells form.

Q. Assertion :Assertion: In plant cells, during S-phase, DNA replication begins in the nucleus, and the centriole duplicates in the cytoplasm. Reason: If the initial amount of DNA is denoted as 2n at