The video explains cellular respiration, starting with glycolysis, which splits glucose into pyruvate, yielding ATP and NADH. It describes cell structure, focusing on mitochondria where the Krebs cycle occurs. The Krebs cycle processes acetyl-CoA, producing NADH, FADH2, and CO2. These molecules enter the electron transport chain, generating ATP. The video also covers alternative pathways for metabolizing proteins and fats.

What is the net gain of ATP molecules from glycolysis?

• 4 ATP

• 3 ATP

• 2 ATP

• 1 ATP

Where does glycolysis occur within a cell?

• Cytoplasm

• Cell membrane

• Nucleus

• Mitochondria

What is the primary function of mitochondria in cellular respiration?

• Protein synthesis

• Energy production

• DNA replication

• Lipid storage

What is produced during the pyruvate oxidation step?

• ATP

• Glucose

• FADH2

• NADH

What molecule is formed when acetyl-CoA combines with oxaloacetic acid?

• Lactic acid

• Citric acid

• Pyruvic acid

• Malic acid

How many NADH molecules are produced per turn of the Krebs cycle?

• 4

• 1

• 2

• 3

What is the role of NADH and FADH2 in cellular respiration?

• They are inputs for the electron transport chain

• They store energy

• They are enzymes

• They are waste products

What is the theoretical maximum yield of ATP from one glucose molecule in cellular respiration?

• 38 ATP

• 36 ATP

• 32 ATP

• 28 ATP

Which molecule serves as a common entry point into the Krebs cycle for different types of nutrients?

• Glucose

• Pyruvate

• Acetyl-CoA

• Lactate

What other macromolecules, besides carbohydrates, can be catabolized to enter the Krebs cycle?

• Proteins and fats

• Water and salts

• Nucleic acids and lipids

• Vitamins and minerals