Given below is a schematic diagram of a portion of DNA. [3 MARKS]

(a) How many strands is it showing?
(b) How many nucleotides have been shown in each strand?
(c) Name the parts numbered 1, 2, 3, 4 and 5 respectively.

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Solution

Each Part: 1 Mark

(a) Two strands are shown in the image.
(b) Two nucleotides have been shown in each strand.
(c) 1. Phosphate
2. Sugar
3. Nitrogenous base ( Pyrimidine)
4. Hydrogen bond
5. Nitrogenous base ( Purine)

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Given below is a schematic diagram of a portion of DNA. [3 MARKS] (a) How many strands is it showing? (b) How many nucleotides have been shown in each strand? (c) Name the parts numbered 1, 2, 3, 4 and 5 respectively.

Each Part: 1 Mark (a) Two strands are shown in the image. (b) Two nucleotides have been shown in each strand. (c) 1. Phosphate 2. Sugar 3. Nitrogenous base ( Pyrimidine) 4. Hydrogen bond 5. Nitrogenous base ( Purine)

Given below is a schematic diagram of a portion of DNA. [3 MARKS]

(a) How many strands is it showing?
(b) How many nucleotides have been shown in each strand?
(c) Name the parts numbered 1, 2, 3, 4 and 5 respectively.

Each Part: 1 Mark

(a) Two strands are shown in the image.
(b) Two nucleotides have been shown in each strand.
(c) 1. Phosphate
2. Sugar
3. Nitrogenous base ( Pyrimidine)
4. Hydrogen bond
5. Nitrogenous base ( Purine)