8. Respiration

Which one of the following molecules is a by-product of cellular respiration?

Which of the summary statements below describes the results of the following reaction?

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

Based on the map of cellular respiration, why do we need to breathe in oxygen?

A biochemist wanted to study how various substances were used in cellular respiration. In one experiment, she allowed a mouse to breathe air containing O₂ 'labeled' by a particular isotope. In the mouse, the labeled oxygen first showed up in

a. ATP

b. NADH

c. CO₂

d. H₂O

If you were to expose cells that are undergoing aerobic respiration to a radioactive oxygen isotope in the form of O₂, which of the following molecules would you expect to be radiolabeled?

a. Pyruvate

b. Water

c. NADH

d. CO₂

Cellular respiration involves ________.

a. The aerobic metabolism of sugars in the mitochondria by a process called glycolysis.

b. An electron transport chain that releases carbon dioxide.

c. The synthesis of ATP, which is driven by the rushing of protons through an ATP synthase.

d. Electron carriers that bring electrons to the citric acid cycle; e. the production of water during the citric acid cycle.