1) the beta pleated sheet is a _____ found in proteins a) primary structure b) secondary structure c) tertiary structure d) quaternary structure 2) which one of the following is a complex biomolecule made from amino acids? a) lipids b) proteins c) polysaccharide d) nucleic acids 3) which one of the following amino acids is an aromatic amino acid? a) lysine b) serine c) phenylalanine d) aspartic acid 4) name the peptide shown in the figure a) tripeptide b) tetrapeptide c) pentapeptide d) dipeptide 5) the main protein found in bones and tendons is a) elastin b) abumin c) keratin d) collagen 6) the main function of albumin in plasma is to a) bind to fatty acids b) transport glucose c) regulate osmotic pressure d) defend the body against infections 7) the main fibrous protein present in the skin is a) melanin b) elastin c) collagen d) keratin 8) which one of the following is an essential amino acid? a) glutamic acid b) aspartic acid c) tyrosine d) lysine 9) a protein which contains carbohydrate attached to the polypeptide chain would be called a a) nucleoprotein b) lipoprotein c) glycoprotein d) metalloprotein 10) secondary structure of collagen is in the form of a a) triple helix b) alpha helix c) beta pleated sheet d) random coil 11) which of the following is NOT a sulfur- containing amino acid? a) serine b) cysteine c) cystine d) methionine 12) the two semi-essential amino acids in adults are a) alanine, lysine b) arginine, histadine c) tyrosine, trytophan d) threonine, valine 13) the protein found in the walls of the blood vessels which helps them to stretch is a) elastin b) keratin c) collagen d) albumin 14) the stereoisomeric form of amino acids found in the human body is a) L alpha b) L beta c) D alpha d) D beta

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