What is the primary reason many organisms, including humans, need oxygen?

• To help plants perform photosynthesis.

• To break down glucose and produce ATP through cellular respiration.

• To extract oxygen from water using gills.

• To make carbon dioxide for plants.

What does ATP stand for and what is its main function in cells?

• Adenosine Diphosphate; it stores genetic information.

• Adenosine Triphosphate; it powers many cellular processes.

• Adenosine Tetraphosphate; it helps in cell division.

• Adenosine Phosphate; it transports oxygen.

What is the key difference between aerobic and anaerobic respiration?

• Aerobic respiration produces less ATP, while anaerobic respiration produces more.

• Aerobic respiration occurs in plants, while anaerobic respiration occurs in animals.

• Aerobic respiration requires oxygen, while anaerobic respiration does not.

• Aerobic respiration uses glucose, while anaerobic respiration uses other sugars.

Which process allows organisms to produce ATP from glycolysis when oxygen is not available?

• Photosynthesis

• Aerobic respiration

• Fermentation

• Krebs Cycle

What does it mean for a molecule to be "oxidized"?

• It gains electrons.

• It loses electrons.

• It gains protons.

• It loses protons.

What is the primary role of fermentation in a cell?

• To produce a large amount of energy (ATP).

• To completely break down glucose into carbon dioxide and water.

• To create NAD+ so that glycolysis can continue.

• To generate oxygen for other cellular processes.

Which of the following are the main products of alcoholic fermentation?

• Lactate and carbon dioxide

• Ethanol and carbon dioxide

• Water and oxygen

• Pyruvate and ATP

Under what conditions do human muscle cells perform lactic acid fermentation?

• When they have plenty of oxygen available.

• When they are not active.

• When they are working intensely and lack enough oxygen.

• When they are producing alcohol.