Exam 8: Microbial Metabolism

Cyanide is a poison which prevents the last carrier in the electron transport chain (cytochrome C oxidase) from transferring the electron to the final electron acceptor. Which of the following would not be a consequence of exposure to this poison?

In order to harvest energy from polysaccharides, lipids or proteins, cells must use to break down these large macromolecules extracellularly before bringing them into the cell.

Catabolic and anabolic reactions depend upon each other, as evidenced by which of the following statements?

Compare and contrast aerobic cellular respiration, anaerobic cellular respiration, and fermentation in terms of purpose, pathways used, the final electron acceptor, amount of ATP produced, method of phosphorylation to produce ATP, the use of an electron transport chain, the role of oxygen, and the end- products (other than ATP) which are produced.

The Entner- Doudoroff pathway is a less efficient alternative to glycolysis which likely evolved early in the history of life to catabolize glucose.

Ribozymes are enzymes which

The main energy benefit of the Krebs cycle is the mass production of both ATP and the reduced factors NADH and FADH₂.

Refer to the numbered steps in the figure when answering the question. Which step shows an energy investment in the form of ATP?

Bacteria that live in deep ocean volcanic vents form the base of an ecosystem that exists without light. They obtain electrons from hydrogen sulfide compounds dissolved in the vent water, and synthesize sugars from carbon, hydrogen, and oxygen. The bacteria would be classified as

Which of the following pathways are operational in a cell growing via fermentation?

A pathway that functions simultaneously in both anabolism and catabolism is termed

Besides biochemical tests, which techniques are also useful for identifying a bacterial specimen?

In chemiosmosis, protons funnel through ATP synthase from an area where they are more concentrated to an area where they are less concentrated.

Which coenzyme is incorrectly matched with its function?

Which category of biochemical tests is incorrectly matched with its description?

Which is the key difference between aerobic and anaerobic respiratory chains?

Which structural and functional feature(s) listed are key to an enzyme's activity?

Which is not one of the categories used to classify an organism based on its nutrition?

Which facts about enzymes are not visualized in this figure?

The graph shows enzyme activity as a function of temperature for a mesophilic microbe. How would you predict that the graph would change if the organism was a psychrophile (an organism that thrives at low temperatures)?