The breaking down of food in the mouth is the first step of the digestive process, It’s important because the food gets broken down into a form that can be absorbed and used.
It is because the enzymes in the plant are breaking down cellulose.
B. Chloroplasts perform photosynthesis, which converts light into sugar, which is food (energy). Then, the organelle mitochondria coverts that energy into a more usable form of energy by the cell, in a process called cellular respiration.
This question is very broad, so one possible answer that's is also very broad is that they can form many other chemical compounds.
<span>George Beadle and Edward Tatum, projected the theory that only one gene and one enzyme are needed for the metabolic pathway. This has contributed to the science of molecular biology, but was proven to be an incorrect theory.</span>