The figure shows part of a DNA molecule - HSC - SSCE Biology - Question 4 - 2019 - Paper 1

To determine the number of complete nucleotides present in the DNA figure, one must understand the structure of a nucleotide. A nucleotide consists of a phosphate group, a sugar molecule, and a nitrogenous base.

1. Identification of Components: Look at the figure and identify what appears to be the complete structure of a nucleotide. It is essential to ensure that all three components (phosphate, sugar, base) are present for a nucleotide to be considered complete.

2. Counting Complete Nucleotides: Carefully count how many sets of these complete components are visible in the provided section of the DNA molecule. Each distinct grouping of a phosphate, sugar, and base constitutes one complete nucleotide.

Upon scanning the figure for complete nucleotide sets, you will find a total of 8 complete nucleotides.

Thus, the correct answer is D. 8.