Exploring Cellular Respiration Processes

This video provides an overview of cellular respiration, focusing on glycolysis, fermentation, the formation of acetyl CoA, and the citric acid cycle. It explains how glucose is broken down to produce ATP, the role of NADH and FADH2 in the electron transport chain, and the efficiency of ATP production. The video also touches on the decision point between fermentation and aerobic respiration, highlighting the importance of oxygen in the process.

What is the initial substrate for glycolysis in cellular respiration?

• Acetyl CoA

• NADH

• Glucose

• Pyruvate

How many net ATPs are produced from one glucose molecule during glycolysis?

• Six

• Two

• Eight

• Four

What happens to pyruvate in the absence of oxygen?

• It forms glucose

• It starts the Krebs cycle

• It undergoes fermentation

• It is excreted as waste

What molecule does pyruvate convert into before entering the Krebs cycle?

• Lactate

• Acetyl CoA

• Glucose

• Carbon dioxide

During the conversion of pyruvate to acetyl CoA, what is released as a byproduct?

• Carbon dioxide

• ATP

• Oxygen

• NADH

How many times is NAD reduced to NADH in one cycle of the Krebs cycle?

• Four

• Two

• One

• Three

What is the primary function of the Krebs cycle in cellular respiration?

• To produce glucose

• To generate ATP directly

• To break down carbon molecules

• To produce electron carriers

Approximately how many ATPs can be produced from one NADH during oxidative phosphorylation?

• Three to four

• Two to three

• Four to five

• One to two

Where does the electron transport chain occur within the cell?

• Mitochondrial inner membrane

• Mitochondrial matrix

• Nucleus

• Cytoplasm

What is the role of the proton gradient in the mitochondria?

• To synthesize DNA

• To break down fats

• To produce glucose

• To generate ATP