Within an organism, both spontaneous and non-spontaneous chemical reactions take place to meet the needs of the organism. Describe how an organism would be affected, in terms of free energy and entropy, if only spontaneous reactions occurred ...

If only spontaneous reactions occurred, then some biological functions such as enzymes would be sort of useless. If reactions happened immediately instead of over a certain period of time, then cellular respiration and such would be pretty screwed up, given that ATP synthesis is pretty darn resourceful as is. In short, the physiology would be very messed up.