Question

which of the following best explains why aerobic respiration is more energy efficient than anaerobic respiration?
aerobic respiration fully breaks down glucose, while anaerobic respiration does not.
aerobic respiration occurs in one step, while anaerobic respiration requires several steps.
aerobic respiration produces more atp per molecule of glucose.
aerobic respiration produces less carbon dioxide per molecule of glucose
question 14
1 pts
energy is required for cellular growth, development, and repair. in which of the following forms must energy be provided in order to be readily available to perform these processes?
lipids
glycogen
atp
glucose

Explanation:

First Question (Aerobic vs Anaerobic Respiration)

To determine why aerobic respiration is more energy - efficient, we analyze each option:

• Option 1: While aerobic respiration fully breaks down glucose and anaerobic does not, the key to energy efficiency is the amount of ATP produced, not just the breakdown completeness.
• Option 2: Both aerobic and anaerobic respiration have multiple steps (aerobic has glycolysis, Krebs cycle, ETC; anaerobic has glycolysis and fermentation), so this is incorrect.
• Option 3: Aerobic respiration produces about 36 - 38 ATP per glucose molecule, while anaerobic produces only 2 ATP per glucose molecule. Higher ATP production means more energy efficiency, so this is correct.
• Option 4: Aerobic respiration produces more carbon dioxide per glucose molecule (6 molecules) compared to anaerobic (2 molecules for lactic acid fermentation or 2 ethanol + 2 CO₂ for alcoholic fermentation), so this is incorrect.

We analyze each option to find the form of energy readily available for cellular processes:

• Option 1: Lipids are a long - term energy storage molecule and need to be broken down to release energy, not readily available.
• Option 2: Glycogen is a storage form of glucose in animals and needs to be broken down into glucose and then further processed to release energy, not readily available.
• Option 3: ATP (adenosine triphosphate) is the immediate energy currency of the cell. When a phosphate group is removed from ATP (forming ADP), energy is released and can be used for cellular processes like growth, development, and repair.
• Option 4: Glucose is a source of energy, but it needs to be broken down through cellular respiration to produce ATP before the energy can be used for cellular processes, so it's not the readily available form.

Answer:

Aerobic respiration produces more ATP per molecule of glucose.

Question 14 (Energy for Cellular Processes)