Respiration Task 2

Which of the following is the primary source of energy in most cells?

• A. Proteins
• B. Carbohydrates
• C. Nucleic acids
• D. Vitamins

In aerobic respiration, glucose is first broken down into:

• A. Acetyl-CoA
• B. Pyruvate
• C. Lactic acid
• D. Ethanol

Which stage of aerobic respiration produces the most ATP?

• A. Glycolysis
• B. Link reaction
• C. Krebs cycle
• D. Electron transport chain

Which of the following is a common intermediate for both fatty acid and glucose metabolism in aerobic respiration?

• A. NADH
• B. Acetyl-CoA
• C. Pyruvate
• D. Lactic acid

Before amino acids can be used in respiration, they must first undergo:

• A. Glycosylation
• B. Hydrolysis
• C. Deamination
• D. Oxidation

Which of the following is a likely reason why lipids provide more energy than carbohydrates?

• A. They are easier to digest
• B. They have fewer carbon atoms
• C. They are more oxidized
• D. They have more hydrogen atoms and can yield more ATP

When proteins are used for energy, their carbon skeletons are converted into intermediates of:

• A. The light-dependent reactions
• B. Photosynthesis
• C. The Krebs cycle
• D. Glycolysis only

Which of the following best describes the role of beta-oxidation in aerobic respiration?

• A. It converts amino acids into glucose in the liver
• B. It breaks down fatty acids into acetyl-CoA units
• C. It transforms glucose into fatty acids
• D. It oxidizes pyruvate to form lactic acid