Nucleic acid structure
QCAA Biology Syllabus 2019 Unit 4 topic 1
Syllabus objectives:
understand that deoxyribonucleic acid (DNA) is a double-stranded molecule that occurs bound to proteins (histones) in chromosomes in the nucleus, and as unbound circular DNA in the cytosol of prokaryotes, and in the mitochondria and chloroplasts of eukaryotic cells
recall the structure of DNA, including
nucleotide composition
complementary base pairing
weak, base-specific hydrogen bonds between DNA strands