Question

1. a scientist observes that a molecule is carrying high - energy electrons from glycolysis into later stages of respiration. without this molecule, atp production would be affected. which molecule is responsible for this function? a) atp b) nad+ c) pyruvate d) adp 3. a student labels the mitochondrions inner compartment and learns this is where pyruvic acid begins a cycle that produces co2, atp, nadh, and fadh2. which location and process are being described? a) cytoplasm - glycolysis b) chloroplast - photosynthesis c) matrix - krebs cycle d) thylakoid - light reactions 4. a sprinter runs a short race. since her muscles dont receive oxygen fast enough, her cells rely on a process that regenerates nad+ so glycolysis can continue making atp. which process is happening in her muscles? a) aerobic respiration b) krebs cycle c) fermentation d) photosynthesis

Explanation:

2.

NAD+ accepts high - energy electrons in glycolysis and carries them to later stages of respiration for ATP production. ATP is the energy - currency molecule, pyruvate is a product of glycolysis, and ADP is a precursor to ATP.

The Krebs cycle occurs in the mitochondrial matrix where pyruvic acid is used to produce CO₂, ATP, NADH, and FADH₂. Glycolysis occurs in the cytoplasm, photosynthesis in chloroplasts, and light reactions in thylakoids.

When muscles lack sufficient oxygen, fermentation occurs to regenerate NAD+ so glycolysis can continue to produce ATP. Aerobic respiration requires oxygen, the Krebs cycle is part of aerobic respiration, and photosynthesis is for plants to make energy - rich molecules.

Answer:

b) NAD+

3.