Microbial Metabolism (GATE)
Topics include microbial fermentation, photosynthesis, coenzymes, amino acid metabolism, and specialized bacterial metabolic pathways
Questions
Which of the following vitamins acts as coenzyme in the synthesis of purines and pyrimidines?
- Biotin
- Pantothenic acid
- Folic acid
- Vitamin E
- Vitamin K
Which of the following pairs is/are not correctly matched?
- Gallionella - Iron bacteria
- Alcaligenes - Carboxydobacteria
- Rhodospirillum - Hydrogen bacteria
- Nitrobacter - Nitrifying bacteria
- 1 and 2
- 1 and 4
- 2 and 3
- 2 and 4
- 3 and 4
Ethanol is not one of the fermentation end products of
- Enterobacter
- Clostridium
- Saccharomyces
- Escherichia
- Salmonella
Which of the following matchings is/are correct?
- Cyanobacteria : Chlorosomes
- Green sulphur bacteria : Thylakoids
- Purple bacteria : Chromatophores
- Only 1
- Only 2
- Only 3
- 1 and 2
- 2 and 3
Match the columns:
| Column - I | Column - II |
| P. Thiamine | 1. Coenzyme in flavoproteins |
| Q. Riboflavin | 2. Part of coenzyme cocarboxylase |
| R. Pyridoxine | 3. Coenzyme involved in the transfer of methyl groups |
| S. Cyanocobalamin | 4. Coenzyme in amino acid metabolism |
- P - 1; Q - 2; R - 3; S - 4
- P - 1; Q - 3; R - 2; S - 4
- P - 2; Q - 1; R - 3; S - 4
- P - 2; Q - 1; R - 4; S - 3
- P - 3; Q - 2; R - 4; S - 1
________ yields ethanol, lactic acid, formic acid, butanediol, acetoin, CO2 and H2 as fermentation end products.
- Saccharomyces
- Clostridium
- Escherichia
- Enterobacter
- Salmonella
Which of the following is a pair of microbes yielding lactic acid as fermentation end product?
- Propionibacterium and Saccharomyces
- Bacillus and Clostridium
- Clostridium and Propionibacterium
- Saccharomyces and Streptococcus
- Bacillus and Streptococcus
Which of the following sulphate-reducing bacteria uses organic compounds from pyruvate synthase pathway as major C-source?
- Archaeoglobus
- Desulfotomaculum
- Thermodesulfobacterium
- Desulfobacterium
- Desulfobacter
Which of the following bacteria yields butanol, acetone, isopropyl alcohol and CO2 as fermentation end products?
- Enterobacter
- Streptococcus
- Salmonella
- Clostridium
- Saccharomyces
Identify the false statements.
- Ubiquinones are non-protein electron carriers located in the inner mitochondrial membrane.
- Entner–Doudoroff pathway occurs both in prokaryotes as well as eukaryotes.
- Non-cyclic photophosphorylation is absent in bacterial photosynthesis.
- Bacteriochlorophyll absorbs in the range of 250-500 nm.
- 1 and 2
- 1 and 3
- 2 and 3
- 2 and 4
- 3 and 4
Pyruvate acts as metabolic precursor of which of the following amino acids?
- Histidine
- Serine
- Alanine
- Valine
- Leucine
- 1, 2 and 3
- 1, 3 and 5
- 2, 3 and 4
- 2, 4 and 5
- 3, 4 and 5
Identify the FALSE statement(s) regarding non-cyclic phosphorylation?
- It is oxygenic process.
- Only one light trapping system (PS I) is involved.
- No NADPH is synthesised.
- NADP acts as last electron acceptor.
- 1 and 2
- 1 and 3
- 2 and 3
- 2 and 4
- 3 and 4
__________ is an example of exclusively ketogenic amino acids.
- Isoleucine
- Lysine
- Tyrosine
- Phenylalanine
- Proline
Which of the following is genus of chemosynthetic filamentous sulphur-oxidising bacteria?
- Rhodospirillum
- Thiobacillus
- Chlorobium
- Chromatium
- Beggiatoa