The need for energy

What does all living organisms being active, growing, making and finding food, deal with threats from other organisms and reproducing depend on?

metabolic reactions and processes continuously taking place in individual cells

Examples of these metabolic activities (3)?

active transport, anabolic reactions and movement brought about by cilia, flagella, or the contractile filaments in muscle cells

What is active transport essential for (4)?

the uptake of nitrates by root hair cells, loading sucrose into sieve tube cells, the selective reabsorption of glucose and amino acids in the kidney and the conduction of nerve impulses

Examples of anabolic reactions (3)?

the building of polymers like proteins, polysaccharides, and nucleic acids essential for growth and repair

What do all these metabolic activities require?

energy