Question

. The covalent (ester / amide /hydrocarbon /hydrogen) bond between peptides is responsible for the (primary /secondary /tertiary /quaternary) structure of a protein. (Delete incorrect answers) (2 pts) 2. (a) Of the twenty amino acids, onlyof them are termed essential amino acids. (1pt (b) What does it mean when an amino acid is termed "essential"? (2 pts) 3. Draw an example of hydrogen bonding between the carbonyl group and the secondary NH group of two different amino acids in the box. (2 pts) 4. Which type of attraction (hydrophobic interaction, H-bonding, ioniclion bridge, covalent) might occur between the side chains of the following pairs of amino acids? (3 pts) (a) alanine and valine (b) serine and serine (e) cysteine and cysteine Attraction: Attraction: Attraction: 5. What defines a "complete" protein source? (2 pts) 6. In the tripeptide below, drag the labels on the right to cirele the appropriate parts. Also drag the asterisks to mark all chiral carbons. (4 pts) H3N-CH-C-NH-CH-C-NH-CH-C-o CH2 CHCHs CHs peptide C-terminal N-terminal nonbolar linkage end end side group (R) 7. Fill in the missing reagent products) of the following reactions. (4 pes) H2O CH3 CHCHs H2O

Answer 1

Primary structure is made from amino acid sequence i . e peptide bonds. > stretches or stands of proteins or peptides have distinct characteristic local structural conformations or secondary structure dependent on hydrogen bonding tertiary structure are caused by many stabilizing forces due to bonding interaction between the side - chain groups of the amino acids the formation of disulfide bridges by oxidation of the sulfhydryl groups on cysteine is an important aspect of the stabilization of protein protein subunits interact with each other and arrange themselves to form a larger aggregate protein complex and this interaction is called as quaternary structure. Thus our answer is the covalent amide bond bond between peptides is responsible for the primary structure of a protein. A) of the 20 amino acids only 10 of them are termed essential amino acid. B) between peptides is responsible is for the primary structure of a protein. B) twenty