Which of the following sub

Which of the following molecular formulas would be for an aldopentose? C4H8O4 C₂H₁408 C6H12O6 C5H1005 D

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.

CONH, HQ NH (CH)3C a.) Put asterisk on chiral centers b.) label each chiral center as R or S. c.) Draw the enantiomer d.) Draw one diastereomer

: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

1) Which of the following statement(s) regarding the ends of polysaccharides are true? All polysaccharides have at least one reducing end. Some polysaccharides may have no reducing end. Some polysaccharides may have no non-reducing ends. All polysaccharides have a N-glycosidic bond at their reducing ends. none of the above 2) The transformation of a monosaccharide into its ______ occurs easily and does not require the assistance of a catalyst. epimer anomer sugar alcohol diastereomer zwitterion

1. Isoelectric point of polypeptide: (1) is pH at which the o-carboxyl and o-amino groups are uncharged. (2) is pH at which the net charge on the molecules in solution is 0. (3) is pH at which the charge of the o-carboxyl group is higher than the charge of the o- amino group. А. (1) only В. (2) only С. (3) only D. (1) and (3) E. (2) and(3)

Explain these diagrams

1. Write the formula for the conjugate base for each of the following acids: а) НCO b) НРО c) HBRO