Question

23. Conversion of thiasulfate to sulfide and sulfate is A. sulfide oxidation C. sulfur disproportionation sulfate reduction D. sulfur lithatrophy 24. Which of the following is denitrification? A, ammonia to ate to dinitrag E. dinitrogen to ammonia c nitrate to ammonia The most oxidized form of carbon icon B. Co c CO D. CHa E. CHE most reduced form of carbon A, co, B. co c. co," D, CH 27, Why do extreme halophile es need such high amounts of Na to stabilize ribosomes c. to counteract high IK E. A and B abilize cell walls D as an 28. Why do extreme halophiles need such high amounts of K to stab ribosomes C to counteract high [Na'] E, A snd C stabilize tel lectron accepta 29 The microorgan ms in the above questi A. Archaea B. Bacteri Eukarya CD hey can be any of these 30, s in the A membrane as part of an ETS C, cytoplasm B. membrane but not part of an ETS D. periplasm 31 Bacteriorhodopsin can convert light energy to ATP by: substrate level phosphorylation c reverse electron transport xidative phosphorylation D, none of these 32 How do some bacteria get rid of mercu A. they reduce it B. they convert it from a very toxic form to a less toxic form C. they convert itte a vclatie form that moves away they metabolize it in both the near environment and the cytoplasm all of the above Minimata disease was named after a terrible event in which A. a company in Japan knowingly put toxic mercury into Minimata Bay B a company in Japan put slightly tonic mercury into Minimata Bav believing it would not be a problem c bacteria methylated mercury when it got to the sediment in the Bay D. bacteria demethylated mercury which went back into the water E. both B and C together accurred

the one that circle are they correct?

Answer 1

24. Denitrification is a process of reduction of nitrates to dinitrogen or molecular nitrogen (N₂). It is carried out by soil microorganisms. Option D is correct.

25. Most oxidized form of carbon is CO₂ . Carbon forms covalent bond with oxygen shaing two electrons and forming covalent bond to completely fill the outer shells and gets oxidized. option A is correct.

26. Most reduced form of carbon is CH₄ . Carbon readily forms bonding with 4 hydrogen atoms by gaining electrons to fill its outer shell. Option E is correct.

32. Bacteria reduce the mercuric ion to metallic mercury form. Under aerobic conditions, the reduction takes place and may require some amount of carbohydrates for reduction. Mercury is removed from near environment as the bacteria utilize it for their growth. Option E is correct.