If you describe something as rip-roaring, you mean that it is very exciting and full of energy. INFORMAL adj ADJ n. ...a rip-roaring movie with a great array of special effects. Translation English Cobuild Collins Dictionary. See also: rip off, ripe, ripen, ripple. Add your entry in the Collaborative Dictionary.
Adenosine triphosphate (ATP), a nucleotide composed of adenine, ribose, and three phosphate groups, is perhaps the most important of the so-called energy-rich compounds in a cell. Its concentration in the cell varies from 0.5 to 2.5 mg/mL of cell fluid.
Some simple cells contain only one or two mitochondria. However, complex animal cells that need a lot of energy, like muscle cells, can have thousands of mitochondria. Energy Factory The main function of mitochondria is to produce energy for the cell. Cells use a special molecule for energy called ATP. ATP stands for adenosine triphosphate. The ATP for the cell is made within the mitochondria. You can think of the mitochondria as the energy factory or power plant of the cell. Respiration Mitochondria produce energy through the process of cellular respiration. Respiration is another word for breathing.