Which of the following sub

Which of these statements about the tertiary structure of a polypeptide is(are) untrue? You may select more than one answer. The tertiary structure will be maintained when the solvent is changed from pure water to aqueous acetic acid. O The tertiary structure is determined in part by the formation of disulfide bridges. Hydrogen bonding interactions are responsible for formation of secondary structure but not tertiary structure, O The tertiary structure is rigid and unchanging. O Charge-charge (electrostatic) interactions can be important in the tertiary structure.

:0-H-1--:N-H Hydrogen Bond Which statement best helps explain the formation of the hydrogen bond represented in the figure? A The oxygen has a partial positive charge, and the nitrogen has a partial negative charge. (B) The nitrogen has a partial negative charge, and the hydrogen attached to the oxygen has a partial positive charge.

What charged groups are present in leucine at a pH = 7? OA) 1× NH3 B) 1 x COO™ O + C) 1× NH3 and 1 x COO™ OD) 2 × NH3+ and 1 × COO- O E) 1× NH3¹ and 2 × COO- + OF) None

Explain these diagrams

Classify the following lipid (choose all that apply).CHOOSE ALL THAT APPLY a. monounsaturated b. omega-6 c. triglyceride d. saturated e. steroid f. polyunsaturated g. omega-3 h. wax ester i. fatty acid

Identify the Lewis acid in the following reaction: A. BF3 B. F C. BF4 D. None of these is an acid. B OD O A O C

6. The [a] of cheatalotic acid is + 10°. The structure shown below was thought to be correct. Answer for Part b HO, COOH H, HO OH Cheatalotic Acid Incorrect Structure a) Why is the structure shown incorrect? b) Propose a cture of cheatalotic acid that can possibly be correct, assuming atom connectivity is correc

A) what does the figure illustrate? B) Label the components in the figure pointed by the arrows and briefly mention the bonding partners involved in each case

The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction  is shown below.  see attachment for Question D.