To solve this problem, we need to identify the type of bond that links amino acids in a protein molecule.$\newline$Proteins are composed of amino acids, which are linked together by peptide bonds.$\newline$A peptide bond is a covalent chemical bond formed between two amino acid molecules.$\newline$This bond occurs when the carboxyl group $(-COOH)$ of one amino acid reacts with the amino group $(-NH_2)$ of another,$\newline$resulting in the release of a molecule of water $(H_2O)$ in a condensation reaction.$\newline$The resulting bond is a $C-N$ bond, specifically called a peptide bond or amide bond.$\newline$Analyzing the options:$\newline$• Option 1: $\alpha$-glycosidic bond is incorrect as it links monosaccharides in carbohydrates.$\newline$• Option 2: $\beta$-glycosidic bond is also incorrect for the same reason as Option 1.$\newline$• Option 3: Peptide bond is correct as it links amino acids in proteins.$\newline$• Option 4: Dative bond is incorrect as it involves a coordinate covalent bond, not typical in protein structure.$\newline$Therefore, the correct option is Option 3: Peptide bond.