Exam 9: Cellular Respiration and Fermentation

Figure 9.1 illustrates some of the steps (reactions) of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions. Figure 9.1 -Which step in Figure 9.1 is a redox reaction?

Figure 9.3 -Which of the following most accurately describes what is happening along the electron transport chain in Figure 9.3?

Yeast cells that have defective mitochondria incapable of respiration will be able to grow by catabolizing which of the following carbon sources for energy?

When skeletal muscle cells undergo anaerobic respiration, they become fatigued and painful. This is now known to be caused by

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

The molecule that functions as the reducing agent (electron donor)in a redox or oxidation-reduction reaction

Figure 9.1 illustrates some of the steps (reactions) of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions. Figure 9.1 -Which step in Figure 9.1 shows a split of one molecule into two smaller molecules?

Why is glycolysis described as having an investment phase and a payoff phase?

During aerobic respiration, electrons travel downhill in which sequence?

High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. Citric acid binds to the enzyme at a different location from the active site. This is an example of

The primary role of oxygen in cellular respiration is to

Which of the following statements describes the results of this reaction? C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

Figure 9.2 The citric acid cycle. -Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see Figure 9.2)?

Why are carbohydrates and fats considered high energy foods?

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

During intense exercise, as skeletal muscle cells go into anaerobiosis, the human body will increase its catabolism of

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate (1) loses a carbon, which is given off as a molecule of CO₂, (2) is oxidized to form a two-carbon compound called acetate, and (3) is bonded to coenzyme A. -These three steps result in the formation of

Figure 9.3 -Figure 9.3 shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + ᵢto ATP?