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?

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Solution

DNA replication takes place in nucleus and duplication of centriole occurs in the cytoplasm. Centriole forms spindle fibres during cell division in animal cells which direct the movement of chromosomes within the cell. The position of centriole determines the position of the nucleus arid plays a crucial role in the spatial arrangement of the cell.

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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. 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

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

G_{1}

, even after S-phase the amount of DNA remains the same i.e., 2n.

Q. Chromatin fibers duplication, Genetic material- 4C, Histone Protein Synthesis, membranous organelle duplication, DNA replication, centriole duplication. How many of the above features are associated with the synthesis phase of the cell cycle?

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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?

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?