1) Which of the following structures fit the definition of carbohydrates? Describe each of them using the aldose/ketose definition. Can any of the structures be defined as either D- or L-configurations? 2) Give the aldose/ketose designation for the following. (a) HOCH2CHOHCH=O (d) (c) (b) (c) 3) Draw all of the D-ketopeptoses using Fischer projections. 4) Have a look at the structures of -D-glucose and -D-glucose. a. Are they anomers? Explain. b. Are they enantiomers? Explain. c. Explain the conventions for using and to designate the configurations of cyclic forms of monosaccharides