Identify the types and the locations of covalent bonds and hydrogen bonds in a DNA molecule.?

Answer 1

Covalent bonds link the individual atoms of each nucleotide, link the nucleotide to its sugar (deoxyribose), and link the sugar to two phosphates. Not sure what you mean by "types". Basically, the covalent bonds hold together the backbone and attach the bases to the backbone of each of the two chains. The hydrogen bonds (along with hydrophobic interactions), hold the two chains together by specific pairings between bases attached to the opposite chains (A with T, C with G). A forms two H bonds with the T, while C forms three H bonds with G.

Answer 2

hydrogen bonds are usually formed by the base pairs, Guanine and Cytosine and Adenosine and Thymine.The hydrogen of Thymin eon N3 makes a hydrogen bond with the lone pairs of nitrogen on N1 and the hydrogen on the amine group of C6 makes hydrogen bond with the lone pairs on the oxygen on position C2. Thus AT makes 2 hydrogen bonds. Hydrogen bonds also form same way between C and G, however here there's 3 hydrogen bonds.
Covalent bonds is formed on the sugarbackbone of the DNA, where the phosodiester makes covalent bonds with the next hydroxyl group of the next base on the strand.