Question

question 1 - 18
all living organisms break down sugar to obtain energy using cellular respiration. which of the following chemical reactions represents the process
oxygen + water --> glucose + lactose
glucose + lactose --> oxygen + water
water + carbon dioxide + energy --> oxygen + glucose
oxygen + glucose --> water + carbon dioxide + energy

Explanation:

Cellular respiration is a process where glucose reacts with oxygen. The products are carbon dioxide, water, and energy (in the form of ATP). Let's analyze each option:

• Option 1: Oxygen and water do not react to form glucose and lactose in cellular respiration.
• Option 2: Glucose and lactose do not react to form oxygen and water in cellular respiration.
• Option 3: This is the equation for photosynthesis (not cellular respiration), where water and carbon dioxide use energy (sunlight) to form oxygen and glucose.
• Option 4: This matches the reactants (oxygen and glucose) and products (water, carbon dioxide, and energy) of cellular respiration.

Answer:

oxygen + glucose --> water + carbon dioxide + energy (the fourth option)