This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Some Principles of Bioenergetics”.
1. The respiratory chain of bacteria is associated with the _____________
a) miitochondrial membrane
b) cytoplasmic membrane
c) cell wall
Explanation: The respiratory chain of bacteria is associated with the cytoplasmic membrane and that of eukaryotes is present in mitochondrial membrane.
2.The prosthetic group of a cytochrome contains how many iron atoms?
Explanation: Cytochromes are a major class of oxidative enzymes whose prosthetic group is a derivative of heme and contains a single iron atom, which is responsible for the oxidative or reductive properties of the enzyme.
3. Among the following which can directly react with oxygen?
a) cytochrome c
b) cytochrome c1
c) cytochrome a
d) cytochrome a3
Explanation: Cytochrome a and a3 together are called cytochrome oxidase, both of them contain copper. But only cytochrome a3 can react directly with oxygen.
4. How many ATP molecules are formed for per molecule of FADH2 reoxidized?
Explanation: Three ATP are formed per molecule of NADH2 reoxidized but only two ATP molecules are formed per molecule of FADH2 reoxidized, because of the high energy of NADH2.
5 .In aerobic respiration the terminal electron acceptor is oxygen,nitrate,sulphate, etc.
Explanation: In aerobic respiration the terminal electron acceptor is oxygen; in anaerobic respiration the final electron acceptor is nitrate, sulphate and carbonate.
6. In photosynthesis by green plants, algae, cyanobacteria which of the following acts as terminal electron acceptor?
Explanation: In photosynthesis by green plants, algae and cyanobacteria, water serves as a primary electron donor and NADP+ as a terminal electron acceptor.
7. A reducing agent will accept electrons and an oxidizing agent will donate electrons.
Explanation: An oxidizing agent will absorb electrons and will therefore become reduced whereas a reducing agent donates electrons, becoming oxidized in the process.
8. Keq is greater than 1.0 depending on which of the following conditions?
a) standard free energy change is negative
b) standard free energy change is positive
c) chemical reaction proceeds in reverse direction
d) products are not formed
Explanation: When standard free energy change is negative value then Keq is greater than 1.0 and the formation of products is favoured.
Sanfoundry Global Education & Learning Series – Microbiology.
To practice all areas of Microbiology, here is complete set of 1000+ Multiple Choice Questions and Answers.