Question

a simple sugar that is an important energy source in living organisms. choose an answer 1 atp 2 glucose 3 fructose 4 starch

Explanation:

Glucose is a simple sugar (monosaccharide). It is a key energy source in living organisms as it undergoes cellular respiration (like glycolysis, Krebs cycle, and oxidative phosphorylation) to produce ATP (the energy - currency of the cell). ATP is not a sugar; it is a nucleotide. Fructose is a simple sugar but is not as central an energy source as glucose in most organisms. Starch is a polysaccharide (complex carbohydrate) and not a simple sugar.

Answer:

1. glucose