StudentAidUnit 2: Bacteria and Viruses — Mcqs
11th Class Biology · Unit 2: Bacteria and Viruses
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Multiple Choice Questions (EXERCISE)
1.Which of the following component is not found in all kinds of bacteria?
2.The bacterial chromosome is typically:
3.In bacterial cells, respiration occurs at:
4.Which group of bacteria is known as a good source of antibiotics?
5.What is the primary function of flagella in bacterial cells?
6.Which type of motility in bacteria is mediated by pili?
7.Which of the following bacterial structures is responsible for detecting and responding to chemicals?
8.Which one of the following is not Nitrifying bacteria?
- a Nitrosomonas
- b Nitrobacter
- c Azotobacter
- d Pseudomonas
9.The enzyme responsible for converting HIV RNA into DNA is:
10.The HIV capsid contains:
SLO BASED MULTIPLE CHOICE QUESTIONS
Structure of Bacteria
11.The major component of bacterial cell wall is:
12.The cell wall of Gram-positive and gram-negative bacteria differs in:
13.Gram-positive bacteria stain purple because they retain:
14.Which bacteria possess pore made up of porin protein, for specific molecules?
15.At some points, bacterial cell membrane invaginates to form vesicles, tubules or lamellae in cytoplasm, these structures are known as:
16.Which of the following is not the function of mesosomes?
17.Chromosome of bacteria differs from eukaryotic chromosomes in:
18.Circular, double-stranded, extra-chromosomal DNA in bacteria is called:
19.Plasmids are used to carry gene of interest for the synthesis of specific:
20.The structure in bacteria, that enable them to resist against antibiotics:
21.Smaller subunit of bacterial ribosome sediments at:
22.Many bacteria can survive extended periods of harsh conditions by forming specialized cells called:
Motility in Bacteria
23.The process by which bacteria make endospores is called:
24.When a bacterial population moves together by means of flagella, it is called:
25.Counter-clockwise rotation of flagellum pushes the cell:
26.Which of the following is similar to twitching movements?
- a Gliding
- b Crawling
- c Brownian movement
- d Swarming
27.The movement used to move over surfaces mediated by pili is called:
- a Crawling
- b Twitching
- c Both (a) and (b)
- d Flagella movement
28.The type of movement in bacteria which is due to expansion created by pushing force of dividing cells is:
29.Spirochetes move by:
- a Flexing
- b Axial filament
- c Modified flagellum
- d All of above
30.Identify movement:
- a Flagella movement
- b Swarming
- c Sliding
- d Twitching
31.Identify movement:
- a Swimming
- b Swarming
- c Sliding
- d Gliding
32.Identify bacteria:
- a Atrichous
- b Monotrichous
- c Peritrichous
- d Lophotrichous
33.The bacteria with tuft of flagella at both poles is:
34.Basal body consisting of (one pair) of rotating rings is found in:
35.The structure which connects basal body with filament, in bacteria is:
Bacteria: Ecology and Diversity
36.The fossil record of prokaryotes shows that archea and bacteria were abundant ........ years ago:
37.Margulis and Schwartz classified bacteria into ........ phyla:
- a 27
- b 8
- c 16
- d 5
38.Escherichia coli belongs to:
39.The group of bacteria which played most important role in history of the Earth for increasing free oxygen in atmosphere:
40.The mats on the sediments in the sea are dominated by:
41.Group of bacteria which lack cell wall resistant to penicillin are:
- a Mycoplasmas
- b Spiroplasmas
- c Spirochetes
- d Both (a) and (b)
42.Many cyanobacteria fix atmospheric nitrogen in their special cells called:
43.Which bacterial group possess 2 to more than 100 flagella?
44.Azotobacter belongs to:
45.About ........ new antibiotics from actinomycetes are being discovered each year.
- a 15
- b 100
- c 150
- d 180
46.Bacillus thuringiensis is Gram ........ soil dwelling bacterium, commonly used as ........
Normal Flora
47.Which of the following is nitrifying bacteria?
48.Which of the following is not included in normal flora of humans?
49.The most likely organ to, get colonized by microbial species is:
50.Enteric bacteria secrete:
Virus
51.Size range of viruses is from 20 nm to:
52.The largest size viruses are:
53.Viruses can pass through filter paper because they are........ times smaller to bacteria:
- a 100 to 10,000
- b 10 to 100
- c 10 to 1000
- d 1 to 10,000
54.Bacterial viruses (bacteriophages) may be icosahedral which means having:
55.Number of capsomeres in virus causing common cold are:
56.The best known phages of E.coli are:
57.How many tail fibres are attached with end plate of a bacteriophage:
58.The spikes of HIV are made up of:
59.The average diameter of HIV is about:
60.The most distinguishing character of retroviruses is the presence of enzyme:
61.The AIDS causing virus was given name of Human Immunodeficiency virus (HIV) in:
62.Experts have concluded that HIV originated in the jungles of Africa among wild:
63.Bacteria whose genome has DNA of some other organism is called:
64.Which is not true about shape of the head of bacteriophages?