11. What is the first step of cellular respiration?
a. Two 3-carbon pyruvic acid molecules enter the mitochondria
b. Glycolysis breaks down a 6-carbon glucose molecule into two 3-carbon pyruvic acid molecules
c. Two ATP molecules are created and carbon dioxide is released as a waste product
d. High-energy electrons interact with enzymes to create ATP molecules



Answer :

Final answer:

The first step of cellular respiration is glycolysis, where a 6-carbon glucose molecule is broken down into two 3-carbon pyruvate molecules, generating ATP.


Explanation:

The first step of cellular respiration is glycolysis, which takes place in the cytoplasm of cells. During glycolysis, a 6-carbon glucose molecule is broken down into two 3-carbon pyruvate molecules, releasing energy that is used to produce ATP.


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