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The figure shows part of a DNA molecule - HSC - SSCE Biology - Question 4 - 2019 - Paper 1
Question 4
The figure shows part of a DNA molecule. How many complete nucleotides are shown in the figure? A. 1 B. 2 C. 4 D. 8
Worked Solution & Example Answer:The figure shows part of a DNA molecule - HSC - SSCE Biology - Question 4 - 2019 - Paper 1
Step 1
How many complete nucleotides are shown in the figure?
Answer
To determine the number of complete nucleotides in the given DNA molecule figure, one must understand the structure of a nucleotide. A nucleotide comprises three components: a phosphate group, a sugar molecule (deoxyribose in DNA), and a nitrogenous base (adenine, thymine, cytosine, or guanine).
Steps to Analyze the Figure:
- Examine the Structure: Identify distinct units in the figure, each of which should contain a phosphate group, a sugar unit, and a nitrogenous base.
- Count Complete Units: Each distinct unit that meets all three criteria (phosphate group, sugar, nitrogenous base) represents a complete nucleotide.
- Final Count: Based on the examination, if the figure displays 8 complete units fitting these criteria, the answer will be option D.
Thus, the answer is D. 8.