CO CH2 O CH2 O H3N-CH-C- NH-CH-C-OCH3

In the space below draw a dipeptide composed of lysine and glutamic acid bound together by peptide bond

which of the following is not correct about peptide bonding? A- It occupies a single plane B- It can associate via H-bonding C- It has a double bond character D- It exhibits geometric isomerism

Select the properties that apply to the secondary structure beta-pleated sheets (select all that apply). can be Antiparallel can be Parallel are right handed Oare left handed obeys n+4 rule are formed by the pattern of hydrogen bonding the backbone makes with itself are formed by the pattern of covalent bonds the backbone makes with itself are formed by the pattern of electrostatic attractions the backbone makes with itself

Draw a peptide bond between two generic amino acids at pH 7; use R1 and R2 for the side chains. include all atoms and bonds in the two amino acide Make the structure is big enough to see cleany.

Please describe what is a peptide bond? What is the significance of the amino terminus versus the carboxy terminus? At which end are amino acids added to form a polypeptide, this is the term for linked amino acids? What are the 3 chemical groups that form an amino acid? A▾ B I I @ & 7

1. Proteins perform critical functions in all of our cells. Without proteins, life wouldn’t exist. Think of some specific proteins and describe what function they perform.  2. Explain the difference between secondary and tertiary protein structures. 3. How many water molecules are produced when a dipeptide is synthesized?

Match the areas of a dipeptide with the labeling number. The N-terminus nitrogen: The C-terminus carbon: The two central (a.) Carbons: and The two side chains: and The peptide bond: between and 2 3 H (N: -C. N- 5 8. H12 CH3 13

2. a. In the following diagram of a portion of a protein, label the types of interactions that are shown. b. What level of protein structure are these interactions producing? b. CH CH3 CH3 Polypeptide backbone CH2 H3C H3Ç 10 CH С—ОН - CH,-S-S-CH,- а. CH2 с. -CH,-CH,-CH2-CH2-NH 0-C-CH2- d.

3. Which best describes the contribution of tertiary (3’) structure of to the native conformation of polypeptides and proteins: a) Structure that results from intrachain interactions of amino acid side chains b) Structure that results from interchain interactions of amino acid side chains c) Structure that results from base pairing d) Structure that results from the linear sequence of amino acids from beginning to end of molecule