Short answerEasy1 mark
1(g)
Expand the following biological abbreviations:
DNA
Topic: DNA
Previous-year question practice database
Answer
Exam answer
DEOXYRIBONUCLEIC ACID.
Explanation
The name describes the molecule: a NUCLEIC ACID whose sugar is DEOXYRIBOSE — ribose with one oxygen removed. RNA is RIBOnucleic acid, retaining that oxygen; the two names record a difference of a single atom.
DNA carries the hereditary information and is arranged as a DOUBLE HELIX of two complementary strands — which is why it can copy itself accurately before every cell division.
Spelling: DEOXYRIBONUCLEIC, one word.
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