instruction:
Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
question:
Question: What catalyst substances may also allow reactions to occur by different pathways that have lower activation energy? Answer: enzymes
answer:
Enzymes may also allow reactions to occur by different pathways that have lower activation energy.

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Question: What is the first stage of cellular respiration? Answer: glycolysis
answer:
The first stage of cellular respiration is glycolysis . It takes place in the cytosol of the cytoplasm.

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Question: What forms a barrier between the cytoplasm and the environment outside the cell? Answer: plasma membrane
answer:
The plasma membrane forms a barrier between the cytoplasm and the environment outside the cell. The plasma membrane has selective permeability.