Question

question 12
which of these is the equation representing cellular respiration?
a. sugar + oxygen + energy -> carbon dioxide + water
b. sugar + oxygen -> carbon dioxide + water + energy
c. sugar + oxygen + carbon dioxide -> water + energy
d. oxygen + water + energy -> carbon dioxide + sugar

Explanation:

Cellular respiration is the process where glucose (sugar) and oxygen are used to produce carbon dioxide, water, and energy (ATP). Let's analyze each option:

• Option A: Has energy as a reactant, which is incorrect. Energy is a product of respiration.
• Option B: Shows sugar and oxygen reacting to form carbon dioxide, water, and energy. This matches the cellular respiration equation: \( \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2

ightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{energy} \) (in the form of ATP).

• Option C: Includes carbon dioxide as a reactant, which is incorrect (carbon dioxide is a product of respiration and a reactant of photosynthesis).
• Option D: The reactants and products are mixed up; this resembles the reverse (photosynthesis - like but incorrect for respiration).

Answer:

B. sugar + oxygen -> carbon dioxide + water + energy