Question

How is each living cell capable to perform certain basic functions?

Answer 1

The DNA gives message to mRNA which then to tRNA then to rRNA in ribosomes
which recreate proteins according to message read
This protein is response for functions fo cell

Answer 2

Cell is the basic structural and functional unit of life.

Each and every cell have cell organelles which are responsible for carrying certain activities in cell itself.

which includes :
a. nucleus
b. Mitochondria
c. Ribosome, etc.

This Ribosome here plays a very major role in ATP formation with mitochondria.

This ATP is energy currency of a cell and are they apply energy requirements of a cell.