Biological termHard0.5 marks
4(b)
Give the Biological / technical term for the following:
The repeating components of each DNA strand lengthwise.
Topic: Nucleotides
Previous-year question practice database
Answer
Exam answer
NUCLEOTIDES.
Explanation
A NUCLEOTIDE has exactly THREE components: a PHOSPHATE group, a five-carbon SUGAR (deoxyribose in DNA) and a NITROGENOUS BASE.
Thousands of nucleotides joined end to end make one strand of DNA — which is what the question means by "repeating components lengthwise".
The hierarchy: phosphate + sugar + base → NUCLEOTIDE → DNA strand → GENE → CHROMOSOME.
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