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Homework answers / question archive / University of Houston MICRO 3332 Quiz 8 1)The attenuation mechanism that helps block expression of the tryptophan operon requires all of the following, except a

University of Houston MICRO 3332 Quiz 8 1)The attenuation mechanism that helps block expression of the tryptophan operon requires all of the following, except a

Biology

University of Houston

MICRO 3332

Quiz 8

1)The attenuation mechanism that helps block expression of the tryptophan operon requires all of the following, except

a.            An mRNA transcript of the trp leader sequence

b.            A ribosome stalled at the stop codon of the trp leader transcript

c.             Formation of an attenuator loop

d.            High intracellular levels of tryptophan

e.            There are no exceptions; A-D are all required

2.            Which of the following among A-D is false?

a.            Stringent response: uses repressors to target specific sigma factors

b.            Phase variation: gene control via manipulation of specific DNA sequences

c.             Small RNA (sRNA): targets mRNAs

d.            Repressor control of the lac operon: transcriptional control mechanism

e.            None are false; A-D are all true

3.            The Entner-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

4.            Which is false among A-C concerning fermentation reactions?

a.            They completely oxidize glucose to carbon dioxide and water

b.            They do not require the presence of oxygen

c.             They do not utilize an electron transport chain

d.            All of the above are correct

5.            Food sources for catabolism supply         ; the energy from these is ultimately used to form ATPs

a.            Heat

b.            Oxygen atoms

c.             Electrons

d.            Proteins

e.            Carbon dioxide

6.            The metabolic reaction, A + B ==> C + D, has a delta G of +3.5 kJ/mol. Which choice among A-D is one that would not likely convert this to a negative delta G process?

a.            Provide a 10-fold excess of reactants A and B over products C and D

b.            Combine ATP formation to this metabolic reaction

c.             Remove products C and D as they are made

d.            Link the metabolic reaction above (A + B ? C + D) to one that uses C and D as reactants

e.            A-D are all ways to convert the reaction to a negative delta G process

 

7.            Which is false regarding catabolic processes?

a.            They release energy

b.            They lead to formation of smaller molecules from larger, complex molecules

c.             Such processes are often coupled, or linked, to ATP formation reactions (i.e., ADP + P to ATP)

d.            None are false; A-C are true statements

8.            Which of the following statements is true regarding the electron donors in bacterial metabolism?

a.            The use of inorganic compounds as electron donors is known as organotrophy

b.            Lithotrophy refers to the use of organic molecules as electron sources

c.             An organotroph could carry out respiration but it could not metabolize via fermentation

d.            Fe2+, H2S, or H2 would be suitable electron donors for lithotrophs

e.            None are true; all are false statements

9.            Which statement among A-C regarding respiration is false?

a.            Respiration by a bacterium can only occur if oxygen is present

b.            ATP production via oxidative phosphorylation occurs during respiration

c.             The formation of numerous, reduced electron carriers (e.g., NADH) occurs during respiration

d.            None of A-C is false; all are true

10.                          The strategy of phase variation of the flagellar genes that occurs in certain pathogenic Salmonella allows it to

a.            Become motile

b.            Manipulate sigma factors

c.             Avoid detection by the immune system

d.            Enter a dormant state much like a spore

e.            None of the above

11.          Which is false among A-C regarding glycolysis?

a.            It initially requires energy input in the form of ATP hydrolysis

b.            It yields ATP and NADH

c.             It forms ATP via substrate level phosphorylation

d.            None of A-C are false; all are true

 

 

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