Questions
Bacillus is the name given to
- rod-shaped bacterium
- spherical-shaped bacterium
- comma-shaped bacterium
- a virus
- star-shaped bacterium
Which of the following correctly describes selective media?
- Selective media are used to detect specific microorganism.
- They allow the growth of desired microbes only.
- They suppress the growth of unwanted microbes.
- They suppress the growth of unwanted bacteria and allow the growth of desired microbes.
- None of these
Which of the following statements is not true about agar?
- It is a polysaccharide.
- It liquefies at 100 degree celsius.
- It solidifies at approximately 40 degree celsius.
- It is metabolised by few bacteria.
- It is a source of nutrients in culture media.
How many phases are there in bacterial growth?
- 5
- 3
- 4
- 6
- 2
Which of the following correctly describes enrichment medium?
- It is a selective medium.
- It is a differential medium.
- It favours the growth of very small number of desired microbes to detectable limits.
- It is a reducing medium and favours the growth of anaerobes.
- It is a complex medium.
Which of the following antibiotics is produced by fungi?
- Bacitracin
- Chloramphenicol
- Gentamicin
- Erythromycin
- Griseofulvin
The term 'trace elements' refers to
- toxic substances
- small mineral requirements
- nitrogen, phosphorus and sulphur
- vitamins
- the elements CHONPS
Antimicrobial drugs are _________ drugs.
- bactericidal
- bacteriostatic
- either bactericidal or bacteriostatic
- antibody-producing
- None of these
Which of the following methods is/are suitable for preserving bacteria for long periods?
- Refrigeration
- Deep-freezing
- Lyophilisation
- Both (2) and (3)
- None of these
Which of the following decribes the mode of action of Penicillin?
- To inhibit the cell wall synthesis
- To inhibit the protein synthesis
- To damage the plasma membrane
- To inhibit the nucleic acid synthesis
- To inhibit the synthesis of essential metabolites
Which of the following options is not correct?
- Amoxicillin, ampicillin, penicillin - inhibitors of cell wall synthesis
- Streptomycin, gentamycin, neomycin - inhibitors of protein synthesis
- Polymyxin B - injury to the plasma membrane
- Acyclovir, ganciclovir, ribavirin - antifungal drugs
- Chloroquine, metronidazole - antiprotozoan drugs
Which of the following statements about bacteria is false?
- They have the ability to move.
- They have peptidoglycan cell walls.
- They reproduce by binary fission.
- They all have the same shape.
- They are prokaryotic.
Which of the following statements is/are true about microbes?
- Some microbes are used in sewage treatment processes.
- Some microbes are used as food for humans.
- Some microorganisms utilise carbon dioxide.
- Some microbes provide nitrogen for plant growth.
- All of the above
Which of the following are skin lesions?
- Vesicles
- Bullae
- Macules
- Papules
- All of the above
Capnophiles are the microbes that are grown
- at high CO2 concentration
- at low CO2 concentration
- using CO2 incubators
- using CO2-generating packet incubators
- Both (3) and (4)
Which of the following are viral diseases?
- Ringworm, Candidiasis, Sporotrichosis
- Scabies, Pediculosis
- Acne, Erysipelas, Folliculitis
- Smallpox, Chickenpox, Measles
- Tetanus, Botulism
Which microbe is the causative agent of acne?
- Pityrosporum ovale
- Streptococcus pyogenes
- Pseudomonas aeruginosa
- Propionibacterium acnes
- Papillomavirus spp.
Psychrotrophs are the bacteria which grow at
- 20-30 degree celsius
- 0 degree celsius
- 40 degree celsius
- 50-60 degree celsius
- Both (3) and (4)
What is the meaning of the word 'Eukaryote'?
- Single-celled organism
- No nucleus
- No nuclear membrane
- True nucleus
- Before nucleus
The term Hyperthermophiles stands for?
- Hperthermophiles are also known as extreme thermophiles.
- Microbes that can grow at 80 degrees or higher
- Organisms living in hot springs associated with volcanic activity
- Both the options 1, 2 and 3 are correct
- Organisms that grow in sunlit soil