MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The amount of oxygen dissolved in hypolimnion water in the winter is __________ to/than the amount of oxygen dissolved in hypolimnion water in the summer |
| A. | greater |
| B. | lesser |
| C. | approximately equal to |
| D. | half |
| Answer» B. lesser | |
| 2. |
Which of the following species in water reveal the presence of fecal pollution of human or animal origin? |
| A. | <i>E.coli</i> |
| B. | <i>Fecal Streptococci</i> |
| C. | <i>Clostridium perfringens</i> |
| D. | All of these |
| Answer» E. | |
| 3. |
Activated sludge undergoes |
| A. | Primary treatment |
| B. | Secondary treatment |
| C. | Tertiary treatment |
| D. | any of these |
| Answer» C. Tertiary treatment | |
| 4. |
The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water. |
| A. | greater |
| B. | lesser |
| C. | approximately equal |
| D. | half |
| Answer» B. lesser | |
| 5. |
__________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them. |
| A. | low oxygen diffusion environment; soils |
| B. | high oxygen diffusion environment; soils |
| C. | low oxygen diffusion environment; lakes |
| D. | high oxygen diffusion environment; lakes |
| Answer» C. low oxygen diffusion environment; lakes | |
| 6. |
Members of all of the following genera of bacteria typically are found in a maturing Winogradsky column except |
| A. | <i>Clostridium</i> |
| B. | <i>Rhodospirillum</i> |
| C. | <i>Chlorobium</i> |
| D. | <i>Escherichia</i> |
| Answer» E. | |
| 7. |
Because it can be used with a variety of media and allow a resuscitation step the __________ technique has become the common and often preferred method of evaluating the microbiological characteristics of water. |
| A. | most probable number |
| B. | Winogradsky |
| C. | MUG |
| D. | membrane filtration |
| Answer» E. | |
| 8. |
Coliforms are used as indicator organisms because |
| A. | they are present wherever enteric pathogens are present |
| B. | a testing procedure with great specificity is easy to perform |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 9. |
Hyphomycete fungi |
| A. | produce nonmotile tetaradiate conidia |
| B. | grow in leaves and the infected leaves are the preferred food source for some aquatic insects |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 10. |
Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments. |
| A. | greater |
| B. | lesser |
| C. | approximately equal |
| D. | half |
| Answer» B. lesser | |
| 11. |
Metabolism of dissolved organic material released by phytoplankton allows heterotrophic bacteria to become part of the particulate organic matter that is passed up the food web to be metabolized and released as mineral elements and CO2 at each transfer. This sentence describes the |
| A. | microbial loop |
| B. | Winogradsky column |
| C. | Redfield ratio |
| D. | Gibbs free energy |
| Answer» B. Winogradsky column | |
| 12. |
The sulfur pearl of Namibia, Thiomargarita namibiensis |
| A. | is the worlds largest bacterium |
| B. | stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume |
| C. | Both (a) and (b) |
| D. | is the worlds smallest bacterium |
| Answer» D. is the worlds smallest bacterium | |
| 13. |
Chemical precipitation of phosphorus is |
| A. | primary treatment |
| B. | secondary treatment |
| C. | tertiary treatment |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 14. |
The Redfield ratio is an index of concentration of |
| A. | carbon, hydrogen and oxygen |
| B. | nitrogen, potassium and iron |
| C. | carbon, nitrogen and phosphorous |
| D. | carbon, phosphorous and sulfur |
| Answer» D. carbon, phosphorous and sulfur | |
| 15. |
Removal of solids is generally considered as a |
| A. | Primary treatment |
| B. | Secondary treatment |
| C. | Tertiary treatment |
| D. | None of these |
| Answer» B. Secondary treatment | |
| 16. |
All of the following species are considered coliforms except |
| A. | <i>Enterobacter aerogenes</i> |
| B. | <i>Klebsiella pneumoniae</i> |
| C. | <i>Salmonella typhi</i> |
| D. | <i>Escherichia coli</i> |
| Answer» D. <i>Escherichia coli</i> | |
| 17. |
Trickling filter comes under |
| A. | primary treatment |
| B. | secondary treatment |
| C. | tertiary treatment |
| D. | none of these |
| Answer» C. tertiary treatment | |