Which type of molecule is shown in the diagram below?
a. peptide
b. carbohydrate
c. lipid
d. nucleic acid

The answer is A. You can see the bond in the form of C-N .  This is called 
                                                                               ||  |
                                                                              O  H
peptide bond. It is formed by two amino acids. For carbohydrate, it is consists of carbon and oxygen and hydrogen. For lipid, it consists of glycerol and fatty acids. For nucleic acid, it consists of nucleotide which has five-carbon sugar, nitrogenous base and phosphate group.

The answer is 323 g.

Acovalent bond is formed between the two hydrogen bonds