Question

a) In case of glucose catabolism, NADH is directly produced as a result of

A) oxidation of NAD+​​​

B) reduction of NAD+

C) neither oxidation nor reduction reactions

b) Some of the common electron acceptors in anaerobic respiration are

A) inorganic sulfate​​

​B) carbon dioxide

C) inorganic nitrate ​​

​D) all of the above

Answer 1

1)In glucose catabolism NADH is produced by the reduction of NAD+. NAD+ is a good electron acceptor and it accepts 2 electrons and a H+ and gets reduced. Eg. NADH formation occuring during the conversion of glyceraldehyde-3 phosphate to 1,3 bisphosphoglycerate during glycolysis iis due to reducton of NAD+.

2) In the absence of oxygen, i.e in anaerobic respiration inorganic sulphate, carbondioxide and inorganc nitrate can serve as electron acceptors. Sulphate gets reduced to hydrogen sulphide, nitrate serves as acceptor in dentrfying bacteria and carbondioxide is mostly the acceptor in methanogenic bactera. So the correct option is d all of the above.