1. Determine what can be said correctly about a monosaccharide the name of which is preceded only by (+)?
a. the compound exists in the pytanose form
b. the compound is the α-anomer
c. the compound has the samestereochemistry at the penultimate carbon as D-(+)-glucose
d. the compound exists only in open - chain form
e. the compound is dextrorotatory
2. Reaction of D-ribose with HNO3 would yield an optically:
a. inactive aldonic acid
b. active aldonic acid
c. active aldaric acid
d. Inactive ironic acid
e. inactive aldaric acid
3. When the penta peptide below is heated first with2,4-dinitrofluorobenzene (and base) and then subjected to acidic hydrolysis which amino acid will bear the dinitrophenyl group? Leu Val Gly Phe Ile
a. Valine
b. Glycine
c. leucine
d. Isoleucine
e. Phenylalanine