There is a large number of mitochondria in cardiac muscle cells because cardiac muscles need the mitochondria to: 1)work harder and longer.
2)maintain their shape.
3)maintain their color.
4)be attached to the ribs.

How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.