Consider the tetrapeptide C-A-F-E Draw the structure of the tetrapeptide at pH 1.3. What is its charge at this point?  Draw the structure of the tetrapeptide at pH 8.2. What is its charge at this point?  Draw the structure of the tetrapeptide with 0 net charges. What is its pL?

C6H12O6 is the chemical formula for a ________. polymer of carbohydrate pentose monosaccharide hexose monosaccharide all of the above

Define the term isomer and distinguish among the three principal isomer types.

Draw the ketose and aldose forms of a monosaccharide with the chemical formula C3H6O3. How is the structure of the monosaccharide changed from one form to the other in the human body?

PREDICT Do any of the amino acid side groups shown below have the potential to form an ionic bond with any of the other side groups shown? If so, which pair(s) could form such an association? (a)CH3 (b)CH2 COO (c)CH2 CH2 NH3+ (d)CH2 CH2 COO (e)CH2 OH

Amino acids have the generic structure seen below, where R represents different carbon-based side chains. Describe how the structure of amino acids allows them to be linked into long peptide chains to form proteins.

List the pyrimidine bases, the purine bases, and the base-pairing rules for DNA.

In the following list, identify the carbohydrate, the fatty acid, the amino acid, and the polypeptide: a. methionine-valine-proline-leucine-serine b. C6H12O6 c. NH2CHRCOOH d. CH3(CH2)16COOH

Why is it impossible for humans to digest food that contains cellulose?

In the following list, identify the carbohydrate, the fatty acid, the amino acid, and the polypeptide: a. NH2CHRCOOH b. C6H12O6 c. (methionine)20 d. CH3(CH2)16COOH