Questions and answers for exam Preparation

MCQs

Total Questions : 43 | Page 3 of 5 pages

Question 21. Which of the following is correct?

Ultramicrobacteria or nanobacteria are the dominant bacteria in marine systems
Ultramicrobacteria or nanobacteria are so numerous that they are a major food source for heterotrophic flagellates
Both (a) and (b)
none of the above

Discuss Question

Answer: Option A. -> Ultramicrobacteria or nanobacteria are the dominant bacteria in marine systems

Question 22. All of the following species are considered coliforms except

Enterobacter aerogenes
Klebsiella pneumoniae
Salmonella typhi
Escherichia coli

Discuss Question

Answer: Option C. -> Salmonella typhi

Question 23. The sulfur pearl of Namibia, Thiomargarita namibiensis

is the worlds largest bacterium
stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume
Both (a) and (b)
is the worlds smallest bacterium

Discuss Question

Answer: Option C. -> Both (a) and (b)

Question 24. Coliforms are used as indicator organisms because

they are present wherever enteric pathogens are present
a testing procedure with great specificity is easy to perform
both (a) and (b)
none of the above

Discuss Question

Answer: Option C. -> both (a) and (b)

Question 25. Hyphomycete fungi

produce nonmotile tetaradiate conidia
grow in leaves and the infected leaves are the preferred food source for some aquatic insects
both (a) and (b)
none of the above

Discuss Question

Answer: Option C. -> both (a) and (b)

Question 26. . Which of the following is correct?

All members of Hyphomycetes are also members of Fungi, but not all members of Fungi are members of Hyphomycetes
All members of Fungi are also members of Hyphomycetes, but not all members of Hyphomycetes are members of Fungi
All members of Hyphomycetes are members of Fungi, and all members of Fungi are members of Hyphomycetes
No member of Hyphomycetes is a member of Fungi

Discuss Question

Answer: Option A. -> All members of Hyphomycetes are also members of Fungi, but not all members of Fungi are members of Hyphomycetes

Question 27. . 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.

most probable number
Winogradsky
MUG
membrane filtration

Discuss Question

Answer: Option D. -> membrane filtration

Question 28. . 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

microbial loop
Winogradsky column
Redfield ratio
Gibbs free energy

Discuss Question

Answer: Option A. -> microbial loop

Question 29. .
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