________ are important because they carry out many of the activities of a cell.
Protiens
nucleic acids
carbohydrates
___________ are molecules that make up membranes of cells and organelles.
proteins
lipids
Sugars and starches are ________ that provide cells with energy.
Nucleic acids
Lipids
Many of the _________ of a cells are made up of chains of carbon atoms.
molecules
amino acids
Elements
Water is very important for a cell because many of the _______ inside a cell take place in water.
chemical Explosions
Chemical reactions
Diffusions
__________ are molecules that carry the information cells need to grow, reproduce, and repair themselves.
Proteins
