Cell Wall is tough, flexible and sometimes rigid and functions to provides cells with structural support and protection. It keeps the cell organelles inside.
The Starbucks cup offers protection from the hands of consumers. It is tough enough that the coffee will not leak out of the sides. It surrounds the coffee and keeps everything inside.
This organelle is called the powerhouse or power generator of the cell because it is where energyis released. This energy is needed for the other functions of the cell such as the production of proteins.
Caffeine is like the mitochondroin because that is what gives the consumer energy. It is a stimulant that wakes people up and gives them energy.