because many of your cells need oxygen to start chemical reaction processes such as mitosis and meiosis.
A substance that lowers the energy needed to start a chemical reaction is a catalyst.
The initial compounds in a chemical reaction are called reactants.
A chemical reaction need an activation energy to start.
The reactants
centrioles
It is neither, the reaction is the process. The chemicals 'put in' to the reaction are called reactants, and those formed by the reaction are products
The reactants
Either an energy source to start the reaction or a catalyst.
Enzymes affect reactions in living cells by lowering the activation energy required for the reactions to occur, thus speeding up the rate of chemical reactions. They do this by binding to specific substrates and catalyzing the conversion of these substrates into products. This enables cells to carry out essential biological processes efficiently.
The substance present at the start of a chemical reaction is called a reactant. Reactants are the starting materials that undergo chemical changes to form products during a reaction.
The energy required to start a chemical reaction is called activation energy. It is the minimum amount of energy needed to initiate a reaction by breaking the chemical bonds of the reactants. This energy barrier must be overcome for the reaction to proceed.