1. Given the information obtained for Deinococcus geothermalis , which steps wou

Question

1. Given the information obtained for Deinococcus geothermalis, which steps would provide a plausible mechanism for generating a proton gradient via the reduction of oxygen (use the BRENDA database, if needed)?

I. Electrons from NADH and FADH2 are transported to UQH2 by Complexes I and II, respectively.

II. Electrons from NADH and FADH2 are transported to UQH2 by Complexes I and III, respectively.

III. Cytochrome c reductase oxidizes UQH2 and reduces cytochrome c.

IV. Cytochrome c reductase (cbb3-type) oxidizes UQH2 and reduced cytochrome c.

V. Complex IV obtains electrons from cytochrome c to reduce oxygen to water.

VI. The cytochrome bd complex obtains electrons from UQH2 to reduce oxygen to water.

a. I and VI

b. I, II, III, IV, V, and VI

c. I, III, and V

d. II and VI

2. The KEGG and NCBI databases contain a wealth of information obtained from sequencing and analyzing the complete genome of Acinetobacter baumannii 1656-2, which is a medically important oxidase-negative (cytochrome c oxidase–negative) bacterium that is multidrug resistant. For this microorganism, which statement regarding oxidative phosphorylation is correct?

a. This microbe possesses subunits for cytochrome c oxidase and therefore displays cytochrome c oxidase activity.

b. The formation of ATP depends directly on the oxidation of cytochrome c.

c. The cytochrome bd complex allows oxygen to be reduced by the quinone pool.

d. Subunit a of the F-type ATPase has 876 amino acids.

Explanation / Answer

Option I III and V are correct. As for the production of ATP or formation of proton gradient the electrons first goes to complex 1 then it transferred to coenzyme Q which carries electron to the complex III. Later Electrons transferred to cytocrome c which electron to complex IV.

Here I am providing a clear diagram to explain the process mor elaborately.

In oxidative phosphorylation in this microorganism the enzyme complexes responsible for ATP synthesis, including NADH dehydrogenase, cytochrome C oxidase, and ATP synthase, and ribosomal protein operons, were up-regulated.

So. This microbe possesses subunits for cytochrome c oxidase and therefore displays cytochrome c oxidase activity.

is the correct option.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.