[问答题]
4. Label the following parts of o+nkr*f d2n 2+gow9b dDNA on the diagram of DNA shown below. (x 7f+: wf br;cs09(,bopdhwl g5 marks)b,d p7rg c olf x0h;s:f9wb+w( (a) Hydrogen bond
(b) Covalent bond
(c) Nitrogenous base
(d) Deoxyribose sugar
(e) A single nucleotide (by drawing a circle encompassing a single nucleotide)