Questions
Trichosporonoides nigrescens sp. is an extremophilic yeast like fungus. Which of the following conditions can it resist?
- High pressure
- Temperature of 45 - 122oC
- Low availability of water
- High sugar concentration
Contractile vacuoles are found in protists. What is their role?
- They store starch and glucose.
- They contain lytic enzymes.
- They pump water out of cells.
- They provide buoyancy to float.
Which of the following microorganisms exhibits radio-resistance (resistance to ionising radiations)?
- Cupriavidus metallidurans
- Milnesium tardigradum
- Spirochaeta americana
- Chloroflexus aurantiacus
On the basis of Gram-reaction, organisms were grouped into four categories in Bergey's Manual of Systematic Bacteriology. Gram-positive organisms were placed in which of the following orders?
- Gracilicutes
- Firmacutes
- Mollicutes
- Mendocutes
Which of the following groups of bacteria has periplasmic flagella?
- Bacillus
- Spirochetes
- Vibrios
- Spirillum
A member of which of the following phyla of archea affects oceanic nitrogen cycle?
- Crenarchaeota
- Thermoplasmata
- Nanoarchaeota
- Lokiarchaeota
Rickettsia and Chlamydia are Gram-negative, non-motile and tiny obligate parasites. They can be differentiated on the basis of which of the following characteristics?
- Nucleic acid
- Inhibition by antibacterial drugs
- Ribosomes
- Source of energy
Which of the following bacteria is characterised by rod shape and peritrichous flagella?
- Beijerinckia
- Xanthobacter
- Alteromonas
- Francisella
Genus Pseudomonas is the leading cause of nosocomial infection. Which of the following species of this genus is of medicinal value?
- P. maltophila
- P. fluorescens
- P. syringae
- P. mallei
Which of the following features characterises Gram-positive genus Brocothrix?
- Aerobic filament forming non-motile rods
- Facultatively anaerobic non-motile rods occurring as long kinked filaments
- Aerobic non-motile short rods
- Aerotolerant long to very short non-motile rods often in chains
Gluconobacter and Acetobacter belong to order Rhodospirillales. They differ from each other on which of the following parameters?
- Family
- Gram-reaction
- Flagella
- Mode of nutrition
Which of the following are included in phylum Fibrobacteres?
- Phosphate solubilising bacteria
- Rumen bacteria
- Glycan utilising bacteria
- Pathogenic bacteria
Which of the following marine archeans appears to be an obligate symbiont on the archaeon Ignicoccus?
- Methanopyrus kandleri
- Sulfolobus solfataricus
- Nanoarchaeum equitans
- Picrophilus torridus
Characteristics:
- Aquatic
- Budding
- Ovoid shape
- Holdfast
Bacteria exhibiting all the given characteristics would most possibly belong to which of the following phyla?
- Flavobacteria
- Green sulphur bacteria
- Planctomycetes
- Purple bacteria
In microbiological classification of bacteria, G-C ratios have been highly recommended for higher level hierarchical classification. Which of the following microbes has the highest G-C content?
- Saccharomyces cerevisiae
- Streptomyces coelicolor
- Arabidopsis thaliana
- Plasmodium falciparum