21. The formula C 2 H 5 OH represents a chemical produced during anaerobic respiration.What is this chemical?A alcoholB glucoseC glycogenD lactic acid

Break Down the Problem

1. Identify the chemical represented by the formula $C_2H_5OH$.
2. Determine which of the options corresponds to this chemical.

Relevant Concepts

• The formula $C_2H_5OH$ is a chemical notation representing a substance.
• Common chemicals produced during anaerobic respiration include alcohols and acids.

Analysis and Detail

• The chemical $C_2H_5OH$ is recognized as ethanol, which is a type of alcohol.
• Anaerobic respiration in yeasts and some bacteria produces ethanol as a byproduct.

Verify and Summarize

• Among the options provided:
  • A: Alcohol (which ethanol is a type of)
  • B: Glucose (the starting substrate for anaerobic respiration)
  • C: Glycogen (stored form of glucose)
  • D: Lactic acid (produced in anaerobic respiration in muscles)

Thus, the correct answer corresponds to the chemical formula provided.

Final Answer

The chemical represented by the formula $C_2H_5OH$ is A) alcohol.