SACE Stage 2 Biology Practice Questions - SACE Stage 2 Biology External Assessment Exam

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Which component of a DNA nucleotide forms the covalent phosphodiester backbone when individual nucleotides are linked together during polymerisation?

The phosphate group of one nucleotide and the 3' hydroxyl group of the adjacent deoxyribose sugar The nitrogenous base of one nucleotide and the nitrogenous base of the adjacent nucleotide The 5' carbon of deoxyribose and the nitrogenous base of the complementary strand The hydrogen bonds formed between complementary adenine and thymine bases

Correct Answer:

The phosphate group of one nucleotide and the 3' hydroxyl group of the adjacent deoxyribose sugar

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