Metabolism | MCQs

Explanation

Explanation

• Oxygen (O2) is the gas used to extract energy from food during cellular respiration.
• It releasing carbon dioxide and water as byproducts.

Explanation

The breakdown of food molecules to release energy is called cellular respiration.

This process involves breaking down glucose and other molecules in the presence of oxygen to produce energy in the form of ATP (adenosine triphosphate).

Cellular respiration occurs in the mitochondria of cells.

Explanation

The G1 phase (Gap 1 phase) is the period of extensive metabolic activity in the cell cycle where the cell grows, enzymes are synthesized, and DNA is replicated.

This phase is also known as the interphase or the growth phase.

Explanation

• Animals that migrate long distances need a compact and energy-dense source of fuel to sustain them during their journey.
• Fat is the most energy-dense nutrient, providing approximately 9 kcal/g, compared to carbohydrates (4 kcal/g) and protein (4 kcal/g).

Explanation

• Glycolysis, the splitting of glucose, releases a small amount of energy that is enough to generate 2 ATP (adenosine triphosphate) molecules.
• This process occurs in the cytosol of cells and is the first step in cellular respiration.

Explanation

Metabolic reactions are both constructive (anabolic) and destructive (catabolic) reactions.