Q1. Give a reason why it is essential for polysaccharides, such as starch or cellulose, to be digested outside of the cell although disaccharides, such as lactose or sucrose, are digestible inside the cell.

Q2. Compute the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 joule seconds; the speed of light is 2.998 x 108 m/s)