Sunday, March 18, 2012

MICROBIOLOGY INTRODUCTION AND BACTERIA ASSIGNMENT

1 Choose the correct statement




Ans:Stanier suggested to consider to include the culture methods in the definition of Microbiology
2 [A]: Microbes are Ubiquitous
[R]: Microorganisms are found in both and extreme conditions of the environment.





Ans:Both A and R are true and R is the correct explanation of A
3 [A]: LAB improve the nutritional quality of food stuffs.
[R]: Lactobacillus plays a role in increasing Vitamin B12 in the curd.





Ans:Both A and R are true and R is the correct explanation of A
4 Match the following





Ans:A - IV, B - III, C - V, D - I
5 Saprophytic microbes play a role in




Ans:Recycling of elements
6 Biogas mainly consists of




Ans:Methane
7 Heidi Schulz is associated with the discovery of following type of microbe.




Ans:Streptococcus
8 Epulopiscium is a




Ans:Bacillus
9 Monstrous bacteria are
I. Thiomargarita namibiensis
II. Cristispira
III. Acetobacter
IV. Epulopiscium fishelsoni





Ans:I and IV
10 Number of cells seen in given plane of Sarcina is




Ans:4
11 Match the following





Ans:A - II, B - V, C- III, D - I
12 If two tetracocci are placed one above the other, it forms




Ans:Sarcina
13 The shape of living Magnet is




Ans:Spiral
14 Choose the correct statement




Ans:Stanier suggested to consider to include the culture methods in the definition of Microbiology
15 [A]: Microbes are Ubiquitous
[R]: Microorganisms are found in both and extreme conditions of the environment.





Ans:Both A and R are true and R is the correct explanation of A
16 [A]: LAB improve the nutritional quality of food stuffs.
[R]: Lactobacillus plays a role in increasing Vitamin B12 in the curd.





Ans:Both A and R are true and R is the correct explanation of A
17 Match the following





Ans:A - IV, B - III, C - V, D - I
18 Saprophytic microbes play a role in




Ans:Recycling of elements
19 Biogas mainly consists of




Ans:Methane
20 Heidi Schulz is associated with the discovery of following type of microbe.




Ans:Streptococcus
21 Epulopiscium is a




Ans:Bacillus
22 Monstrous bacteria are
I. Thiomargarita namibiensis
II. Cristispira
III. Acetobacter
IV. Epulopiscium fishelsoni





Ans:I and IV
23 Number of cells seen in given plane of Sarcina is




Ans:4
24 Match the following





Ans:A - II, B - V, C - III, D - I
25 If two tetracocci are placed one above the other, it forms




Ans:Sarcina
26 The shape of living Magnet is




Ans:Spiral
27 Invaginations of Bacterial Plasma membrane are
I. Chlorobium vesicles
II. Intracytoplsmic membranes
III. Mesosomes





Ans:II and III
28 Gas vacuoles are seen in




Ans:Halobacterium
29 [A]: Bacteria are haploid
[R]: They have only one linear chromosome in their nucleoid





Ans:A is true but R is false
30 [A]: Lactobacillus has mesosomes
[R]: Structures of cell membrane that help in binary fission are present in Gram +ve bacteria





Ans:Both A and R are true and R is the correct explanation of A
31 In all bacteria, the cell membrane is involved in




Ans:Osmoregulation
32 In one of the following features bacteria show resemblance with Fungi




Ans:Type of reserve food materials
33 Plasmid is made of




Ans:Double stranded DNA
34 Colicins are a type of




Ans:Toxins whose synthesis is under the control of Plasmid
35 Vacuoles of bacteria help in




Ans:Maintaining the position of bacteria in water body
36 Study the following with respect to Bacteria and identify the correct match





Ans:A - V, B - IV, C - I, D - III
37 Study the following table with respect to Bacteria and choose the correct combination





Ans:I and II
38 These structures of bacteria can be found as aggregates
I. Chlorobium vesicles
II. Mesosomes
III. Gas vacuoles
IV. Ribosomes





Ans:III and IV
39 Choose the incorrect statement




Ans:Volutin granules are Poly β-hydroxybutyrate granules
40 [A]: Rhodomicrobium is photosynthetic
[R]: It converts CO2 into organic compound





Ans:A is true but R is false
41 Chemoheterotrophs use the energy of electrons of the following atoms of organic compound




Ans:Hydrogen
42 Carbon source and energy source is same substance in the nutrition of




Ans:Salmonella
43 Denitrifying bacteria are




Ans:Chemoautotrophs
44 Match the following





Ans:A - IV, B - V, C - II, D -I
45 Study the following table and choose the correct combination





Ans:II and III
46 Species of the genus Thiobacillus can oxidize
I. Fe+2
II. Fe+3
III. S
IV. NO3





Ans:I, III, IV
47 Bdellovibrio bacteriovorous naturally purifies the water of river




Ans:Ganges
48 The following mode of nutrition is shown by only bacteria




Ans:Cheomoautotrophism
49 The most common method of reproduction in bacteria is




Ans:Binary Fission
50 Arrange the following in correct sequence during Binary Fission in Bacterial cell
I. Constriction formation on the cell wall
II. Elongation of cell
III. Division of Protoplasm
IV. Replication of Chromosome





Ans:II, IV, III, I
51 Upon successful growth of 10 bacterial cells for 3 hours, how many cells are formed at the end. (Bacterium divides once in every 20 min.)




Ans:5120
52 The structure of bacterial cell that plays a key role during binary fission is




Ans:Mesosomes
53 Arrange the following events in correct sequence during conjugation in E.coli
I. Coming closer of F+ and F- cells.
II. Movement of single stranded Plasmid through conjugation canal
III. Establishment of conjugation canal
IV. Double stranded nature of F plasmid in receipient cell





Ans:I, III, II, IV
54 Lederberg was involved in the discovery of
I. Conjugation
II. Binary Fission
III. Transformation
IV. Transduction





Ans:I and IV
55 Match the following





Ans:A - IV, B - II, C - I, D - III
56 [A]: True sexual reproduction is absent in Bacteria
[R]: Bacteria do not show syngamy





Ans:Both A and R are true and R is the correct explanation of A
57 If 20 bacterial cells divide at the rate of once in every 20 minutes for 2 hours, what is the number of bacterial cells, number of binary fissions and number of generations of divisions occured respectively




Ans:1280, 1260, 6
58 Choose the incorrect statement/s
I. Karyokinesis and Cytokinesis occur simultaneously during binary fission.
II. DNA replication and karyokinesis occur simultaneously in Binary fission of Bacteria
III. Furrow formation on cell membrane and cell wall is simultaneous in bacterial binary fission
IV. The two daughter cells formed from a cell upon binary fission are always identical in all aspects.





Ans:All except II
59 Choose the correct statement




Ans:Cells of bacteria do not fuse during the sexual process
60 In a test tube with bacterial suspension, there are 10,000 bacteria belonging to the species E.coli. Among them 10% belong to F+ strain and the remaining F- strain. These bacteria show conjugation once in every 5 minutes. If there is no binary fission between these bacteria, upon completion of 15 minutes, how many bacteria remain as F- and how many as F+.




Ans:800 F+,, 200 F-
61 Bacterial genera that can be friends as well as foes to mankind are
I. Bacillus
II. Clostridium
III. Xanthomonas
IV. Agrobacterium





Ans:I, II, IV
62 Scavengers of nature are




Ans:Chemoheterotrophs
63 Match the following





Ans:A - II, B -IV, C - V, D - I
64 The following bacterium is used for industrial production of amino acid




Ans: Corynebacterium glutamicum
65 ATP formed in Photophosphorylation are used for Nitrogen fixation but not for CO2 fixation in




Ans:Rhodomicrobium
66 Match the following





Ans:A - IV, B - III, C - V, D - I
67 Tea leaves are cured by using




Ans:Coccus
68 Match the following





Ans:A - III, B - II, C - V, D - I
69 Streptomyces venezuelae is used in the production of




Ans:Chloramphenicol
70 Match the following





Ans:A - II, B - IV, C - I, D - V
71 Species of Mycobacterium cause
I. Leprosy
II. Actinomycosis
III. Brucellosis
IV. Tuberculosis





Ans:I, II, IV
72 Match the following





Ans:A –IV, B – III, C – II, D - I
73 [A]: Most of the antibiotics are produced by the species of Streptomyces
[R]: Streptomyces polymyxa produces Polymyxin B





Ans:A is true but R is false
74 Match the following





Ans:A - V, B - IV, C - II, D - I

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ASTHRA JUNIOR COLLEGE , VIJAYAWADA