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University of Houston MICRO 3332 Quiz 9 1)The Enter-Douderoff pathway, the Embden-Meyerhof-Parnas pathway, and the Pentose Phosphate shunt a

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University of Houston

MICRO 3332

Quiz 9

1)The Enter-Douderoff pathway, the Embden-Meyerhof-Parnas pathway, and the Pentose Phosphate shunt

a.            Completely oxidize glucose to carbon dioxide and water

b.            Are anabolic pathways that require the input of energy to proceed

c.             Can all oxidize glucose to different intermediates and generate NADH and/or NADPH

d.            Are different ways in which bacteria can ferment

e.            None of the above

2.            Fermentation reactions

a.            Completely oxidize glucose to carbon dioxide and water

b.            Often require the reactions of glycolysis to provide energy as ATP

c.             Supply NAD+ for the oxidation of glucose

d.            Operate in the presence of oxygen

e.            Two of the above are correct

3.            Catechol formation by means of dioxygenase enzymes is a central intermediate in the catabolism of which of the following

a.            Polysaccharides

b.            Aromatic compounds

c.             Lipids

d.            Proteins

e.            Nucleic acids

4.            Which is true regarding TCA cycle (Krebs cycle)

a.            Pyruvate is an end product of the cycle

b.            Energy capture in the cycle is solely from the formation of ATP in one of the steps

c.             Entry of carbon dioxide starts the cycle

d.            Some components of the cycle are used as building blocks for certain anabolic pathways

e.            Two of the above are true

5.            What is the relationship between the reduction potential, E, and the change in free energy, delta G

a.            If E is positive, then delta G is also positive and the reaction is favorable

b.            If E is negative, then delta G is also negative and the reaction is unfavorable

c.             If E is positive, then delta G is negative and the reaction is favorable

d.            If E is positive, then delta G is negative and the reaction is unfavorable

6.            The reaction, X+ + 2e- + 2H+ ? XH2 has a reduction potential (E) of -330 mV.

Based on this, XH2 can be considered a weak electron donor

a.            True

b.            False

7.            Metabolism using an electron transport system is classified based on the nature of the initial electron donors and terminal electron acceptors. Lithotrophy is defined as the use of

 

a.            Organic molecules as the initial electron donors

b.            Organic molecules as the final electron acceptors

c.             Inorganic molecules as the initial electron donors

d.            Inorganic molecules as the final electron acceptors

e.            Two of the above are correct

8.            A bacterial species that can grown when supplied an energy source and carbon source consisting of H2 and CO2, respectively, and nitrate as a terminal electron acceptor, would correctly be considered:

a.            Hydrogenotroph

b.            Lithotroph

c.             Anaerobic respiration

d.            Two of the above are correct

e.            All of the above are correct

9.            Any type of phototrophy involves: light-absorbing photoreceptors, excitation of electrons, or other molecule by light, and a mechanism to link the photoreceptor process to energy storage. What is missing from this list that is also common to all types of phototrophy

a.            Presence of chlorophyll

b.            Oxygen as the terminal electron acceptor

c.             Presence of a membrane where photoreceptors are stored

d.            Water as the supplier of electrons to the phototrophic system

e.            Two of the above are correct

10.          Which of the following statements is true concerning phototrophy among halobacteria (archaea), cyanobacteria, and non-cyanobacterial photosynthesizers like Rhodospirillum or Rhodobacter

a.            Halobacteria (archaea): photosynthesize the same way as plants and algae

b.            Cyanobacteria: have a non-chlorophyll-based, light-driven proton pump that yields ATP

c.             Rhodospirillum: possess bacteriochlorophyll; do not photosynthesize the same way as cyanobacterial species

d.            Halobacteria (archaea): absorbs light in the blue and red wavelengths

e.            None are false, A-D are all true statements

11.          Bacteria that carry out dissimilatory metal reduction are those that can use metals as terminal electron acceptors, and then incorporate the reduced metal internally so it becomes part of the cell’s metabolism

a.            True

b.            False