Cellular respiration involves many chemical reactions. When a chemical process involves a series of reactions, scientists may summarize the process with a single chemical equation. This equation shows only the key reactants and products. For example, cellular respiration often uses a sugar called glucose and oxygen gas as key reactants. This process can be summarized by the following chemical equation: glucose + oxygen → carbon dioxide + water Glucose, like other sugar molecules, often serves as an energy source for cells. Cells release energy by breaking down glucose through chemical reactions with oxygen gas. This process produces carbon dioxide gas and water. Use the tiles to complete the sentence. carbon The key reactants of this process are and . Submit

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1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.