Question

which stage of cellular respiration involves the production of water?
a. glycolysis
b. citric acid cycle
c. electron transport chain
d. photosynthesis
what is the function of the mitochondrion in cellular respiration?
a. it stores atp for cellular activities.
b. it hosts the citric acid cycle and the electron transport chain.
c. it breaks down glucose in the cytoplasm.
d. it synthesizes proteins in the nucleus.
how is atp generated during the electron transport chain?
a. by breaking down glucose in the cytoplasm
b. by combining pyruvate with oxygen
c. by converting water into oxygen and hydrogen
d. by using energy from electrons to pump protons and drive atp synthesis

Explanation:

1. In cellular respiration, water is produced in the electron - transport chain when electrons are passed to oxygen and combine with protons. Glycolysis breaks down glucose to pyruvate without water production. The citric - acid cycle generates carbon dioxide and energy - carrying molecules but not water as a main product. Photosynthesis is the process of making glucose and oxygen from carbon dioxide and water, not related to water production in cellular respiration.
2. The mitochondria host the citric - acid cycle and the electron - transport chain in cellular respiration. It doesn't store ATP but is involved in its production. Glucose is broken down in the cytoplasm during glycolysis, not in the mitochondria. Protein synthesis occurs in the ribosomes, not in the mitochondria related to cellular respiration functions.
3. During the electron - transport chain, energy from electrons is used to pump protons across the inner mitochondrial membrane, creating a proton gradient. This gradient is then used by ATP synthase to drive ATP synthesis. Breaking down glucose in the cytoplasm is glycolysis. Combining pyruvate with oxygen occurs in the mitochondria but not the main way of ATP generation in the electron - transport chain. Converting water into oxygen and hydrogen is part of photosynthesis, not related to ATP generation in the electron - transport chain.

Answer:

1. c. Electron Transport Chain
2. b. It hosts the Citric Acid Cycle and the Electron Transport Chain
3. d. By using energy from electrons to pump protons and drive ATP synthesis