MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 195 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The transfer of genes from one cell to another by a bacteriophage is known as __________________ |
| A. | Recombination |
| B. | Conjugation |
| C. | Transduction |
| D. | Transformation |
| Answer» D. Transformation | |
| 152. |
Which of the following is true about β-ionone, non-ionic detergent used in β carotene fermentation medium? |
| A. | It is a precursor of β-carotene fermentation process |
| B. | It is regarded as "steering" factor associated with bringing about the presence and activity of the enzymes responsible for β-carotene formation |
| C. | It is an inducer of β carotene fermentation process |
| D. | None of the above |
| Answer» C. It is an inducer of β carotene fermentation process | |
| 153. |
In conjugation only small fragments of the bacterial chromosome are transferred. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 154. |
Sickle cell anemia is which type of mutation? |
| A. | nonsense mutation |
| B. | missense mutation |
| C. | deletion mutation |
| D. | insertion mutation |
| Answer» C. deletion mutation | |
| 155. |
Fungal amylases using stationary culture with wheat bran utilizes |
| A. | A. oryzae |
| B. | A. niger |
| C. | A. flavus |
| D. | S. cerevisiae |
| Answer» B. A. niger | |
| 156. |
What is the frequency of formation of recombinants in a F+ X F— cross? |
| A. | 100 |
| B. | 40 |
| C. | 10 |
| D. | 1 |
| Answer» E. | |
| 157. |
Which of the following is not a penicillin? |
| A. | Penicillin G |
| B. | Penicillin X |
| C. | Penicillin V |
| D. | Penicillin Y |
| Answer» E. | |
| 158. |
The leavening or rising of dough is due to which of the following gases? |
| A. | oxygen |
| B. | carbon dioxide |
| C. | hydrogen |
| D. | sulphur dioxide |
| Answer» C. hydrogen | |
| 159. |
Base analogs have the same hydrogen-bonding properties as the normal bases. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 160. |
Which of the following organisms have shown the ability of phosphate solubilization in red wine? |
| A. | S.cerevisiae |
| B. | Gluconobacter oxydans |
| C. | Bacillus subtilis |
| D. | None of these |
| Answer» C. Bacillus subtilis | |
| 161. |
During fermentation, pyruvic acid is converted into organic products such as |
| A. | glucose and fructose |
| B. | starch and cellulose |
| C. | ethyl alcohol and lactic acid |
| D. | citric acid and isocitric acid |
| Answer» D. citric acid and isocitric acid | |
| 162. |
Which of the following agents involve biosensors linking with electronic circuit? |
| A. | Microorganisms |
| B. | Microbially derived enzymes |
| C. | Either microorganisms or microbially derived enzymes |
| D. | Neither microorganisms nor microbially derived enzymes |
| Answer» C. Either microorganisms or microbially derived enzymes | |
| 163. |
The method used for obtaining citric acid as fermentation product are commonly known as |
| A. | submerged aerated fermentation |
| B. | stationary tray fermentation |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 164. |
Which type of E.coli strain was chosen to prove the experiment of conjugation? |
| A. | prototrophs |
| B. | auxotrophs |
| C. | polyauxotrophs |
| D. | autotrophs |
| Answer» D. autotrophs | |
| 165. |
Pectinase, an enzyme used for increasing yield and for clarifying juice is obtained by |
| A. | A. oryzae |
| B. | A. niger |
| C. | A.flavus |
| D. | all of these |
| Answer» E. | |
| 166. |
Mating between species is necessary for recombination to take place. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 167. |
Bacitracin, an antibiotic similar to penicillin, is produced by |
| A. | Bacillus polymyxa |
| B. | Streptomyces erythreus |
| C. | Bacillus licheniformis |
| D. | Aspergillus fumigatus |
| Answer» D. Aspergillus fumigatus | |
| 168. |
Which of the following microorganism can yield vitamin B12 using methanol as a carbon source? |
| A. | Methanobacterium soehngenii |
| B. | Methanobacillus omelianski |
| C. | Protaminobacter ruber |
| D. | All of the above |
| Answer» E. | |
| 169. |
Commercial scale production of amino acids is typically carried out using |
| A. | regulatory mutants to cause overproduction of biochemical intermediates |
| B. | creation of an intentional increase in membrane permeability to increase release of the amino acids |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 170. |
Flavor can be enhanced from the |
| A. | L-Alanine |
| B. | D-L-Alanine |
| C. | L-Aspartic acid |
| D. | all of these |
| Answer» E. | |
| 171. |
Which of the following was the first amino acid to be produced commercially? |
| A. | L-glutamic acid |
| B. | L-lysine |
| C. | L-cystine |
| D. | L-methionine |
| Answer» C. L-cystine | |
| 172. |
It is mandatory that cultures and fermentation residues be sterilized before discard in case of Eremothecium ashbyii and Ashbya gossypii because they are |
| A. | plant pathogens |
| B. | human pathogens |
| C. | plant mutants |
| D. | none of these |
| Answer» B. human pathogens | |
| 173. |
What temperature is necessary for the production of vinegar? |
| A. | 43 degree C |
| B. | 60 degree C |
| C. | 10-13 degree C |
| D. | 15-34 degree C |
| Answer» E. | |
| 174. |
We require cell-free DNA for transformation to take place. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 175. |
The F factor DNA is sufficient to specify how many genes? |
| A. | 2 |
| B. | 10 |
| C. | 40 |
| D. | 100 |
| Answer» D. 100 | |
| 176. |
Which of the following cells of E.coli are referred to as F—? |
| A. | Male cells |
| B. | Female cells |
| C. | Both male and female cells |
| D. | Neither male nor female cells |
| Answer» C. Both male and female cells | |
| 177. |
What is the pH required for production of baker’s yeast? |
| A. | 1 to 2 |
| B. | 4 to 5 |
| C. | 7 to 8 |
| D. | 10 to 12 |
| Answer» C. 7 to 8 | |
| 178. |
Which of the following enzymes acts on the DNA after its entry into the cell? |
| A. | ligases |
| B. | endonucleases |
| C. | deoxyribonucleases |
| D. | exonucleases |
| Answer» D. exonucleases | |
| 179. |
Penicillium chrysogenum is a better penicillin producing species. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 180. |
In which phase of growth does the recipient cell takes up the donor DNA? |
| A. | lag phase |
| B. | early logarithmic phage |
| C. | late logarithmic phage |
| D. | stationary phage |
| Answer» D. stationary phage | |
| 181. |
The production of alcohol from lactose of whey is generally carried out by |
| A. | Saccharomyces cerevisiae |
| B. | Candida pseudotropicalis |
| C. | Candida utilis |
| D. | none of these |
| Answer» C. Candida utilis | |
| 182. |
The medium for production of Baker’s yeast contains only molasses and inoculum. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 183. |
Which of the following yeast can be used to produce microbial protein? |
| A. | Saccharomyces cerevisiae |
| B. | Candida milleri |
| C. | Eremothecium ashbyi |
| D. | Candida utilis |
| Answer» E. | |
| 184. |
Gluconic acid is produced by which of the following molds? |
| A. | Aspergillus niger |
| B. | Rhizopus nigricans |
| C. | Aspergillus terreus |
| D. | Rhizopus oryzae |
| Answer» B. Rhizopus nigricans | |
| 185. |
Fermentation of rice is carried out by which of the following microorganisms? |
| A. | bacteria |
| B. | yeasts |
| C. | molds |
| D. | protozoa |
| Answer» D. protozoa | |
| 186. |
Which of the following enzymes is used to hydrolyze starch to dextrin? |
| A. | invertase |
| B. | pectinase |
| C. | amylase |
| D. | protease |
| Answer» D. protease | |
| 187. |
Which of the following techniques is used to improve penicillin production? |
| A. | fed-batch fermentation |
| B. | submerged-culture technique |
| C. | continuous fermentation |
| D. | batch fermentation |
| Answer» C. continuous fermentation | |
| 188. |
Which of the following product acts as a substrate for the production of citric acid? |
| A. | molasses |
| B. | corn-steep liquor |
| C. | barn |
| D. | oyabeen meal |
| Answer» B. corn-steep liquor | |
| 189. |
Paper, glass beads can be used to immobilize enzymes. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 190. |
Which of the following enzyme is used in the process of bating? |
| A. | invertase |
| B. | pectinase |
| C. | amylase |
| D. | protease |
| Answer» E. | |
| 191. |
Solvents and enzymes are found in which of the following categories of microbial products? |
| A. | Pharmaceutical chemicals |
| B. | Commercially valuable chemicals |
| C. | Food supplements |
| D. | Alcoholic beverages |
| Answer» C. Food supplements | |
| 192. |
Eco R1 cuts the plasmid DNA and the donor DNA such that both the ends are same. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 193. |
Which of the following enzymes cut the DNA molecule at particular nucleotide sequence? |
| A. | restriction endonuclease |
| B. | exonuclease |
| C. | ligase |
| D. | polymerase |
| Answer» B. exonuclease | |
| 194. |
Industrial fermentation are performed in large tanks of capacity ______________ |
| A. | 100 gal |
| B. | 1000 gal |
| C. | 50,000 gal |
| D. | 10,000 gal |
| Answer» D. 10,000 gal | |
| 195. |
Which of the following is not a desired characteristic of the organism to be used for industrial application? |
| A. | should produce less amount of product |
| B. | should be readily available |
| C. | should grow rapidly |
| D. | should be nonpathogenic |
| Answer» B. should be readily available | |