Q2 of 33 Page 10

The three sketches gave below (A, B and C) are intended to represent the replication of DNA. What should be their correct sequence starting with the first and ending with the last?

In the given sketches, the correct sequence of replication is B, C, and A.


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2

What are genes?

 1

Given below is a schematic diagram of a portion of DNA.


(a)How many strands are shown in the diagram?


(b) How many nucleotides have been shown in each strand?


(c) Name the parts numbered 1, 2, 3, 4 and 5 respectively.


(d) Name the DNA unit constituted by the parts 1, 2 and 3 collectively.

 1

The number of chromosomes in a certain type of cell division is halved. This kind of cell division occurs in

 2

In which one of the following options the two stages of mitosis have been given incorrect sequence?