Microbiology
Useful for GATE, PMT and others Life Sciences Entrance examination.
Questions
Match the following columns:
| (a) Dark field microscope | (i) Merten et al |
| (b) Phase contrast microscope | (ii) Talbot |
| (c) Interference microscope | (iii) Zsigmondy |
| (d) Polarising microscope | (iv) Zernicke |
- (a) – (i), (b) – (ii), (c) – (iii), (d) – (iv)
- (a) – (iii), (b) – (iv), (c) – (i), (d) – (ii)
- (a) – (iii), (b) – (i), (c) – (iv), (d) – (ii)
- (a) – (i), (b) – (iii), (c) – (ii), (d) – (iv)
- (a) – (iii), (b) – (ii), (c) – (i), (d) – (iv)
Which of the following bacteria are gram-positive and responsible for the peculiar odour emanating from the soil after rain (petrichor), mainly in warmer climates?
- Bacteroidetes
- Proteobacteria
- Actinobacteria
- Spirochetes
- Cyanobacteria
Which of the following is a prokaryotic microbe?
- Yeast
- Sporozoan
- Spirochete
- Diatom
- Choanoflagellate
Which of the following bacteria are gram-negative, filamentous anoxygenic phototrophs, which use reduced sulphur compound for phototrophy, and also show 3-hydroxypropionate CO2 assimilatory pathway, with one of its species specially used for the study of evolution of photosynthesis?
- Firmicutes
- Chloroflexus
- Actinobacteria
- Mycoplamsas
- Cyanobacteria
Unicellular eukaryotes reproduce by
- mitosis
- meiosis
- syngamy
- All of the above
- Both (1) and (2)
Which of the following bacteria are spirochetes?
- Mycobacterium leprae and Corynebacterium diphtheriae
- Neisseria gonorrhoeae and Escherichia coli
- Chlamydia trachomatis and Chlamydia psittaci
- Treponema pallidum and Borrelia burgdorferi
- Calothrix and Xenococcus
What do we call the rupturing of cells in order to release various constituents and then keeping them in their natural state by means of a special 0.25 M sucrose solution kept at 0⁰ - 4⁰ centigrade?
- Differential centrifugation
- Homogenisation cell fraction
- Nuclear fraction
- Mitochondrial fraction
- Microsomal fraction
How many components are there in Gram’s staining process?
- 2
- 3
- 4
- 5
- 6
Which of the following is NOT a phylum of Archaea?
- Euryarchaeota
- Glaucophyta
- Crenarchaeota
- Korarchaeota
- Nanoarchaeota
What was the range of magnification of the compound microscope used by Robert Hooke?
- 10 - 20
- 40 - 60
- 5 - 15
- 14 - 42
- 16 - 76
Firmicutes are a phylum of bacteria. Which of the following statements is/are true about firmicutes?
1. They have low GC content in DNA.
2. They never form endospore.
3. Most of them have gram-positive cell wall structure.
- 1 only
- 2 only
- 3 only
- 1 and 3 both
- 2 and 3
Match the following columns:
| Column – I |
</strong>|<strong>Column – II</strong>|
|A. Acetic acid|1. Produced by Clostridium butyricum|
|B. Butyric acid|2. Produced by AAB|
|C. Lactic acid|3. Produced by Aspergillus niger|
|D. Citric acid|4. Produced by LAB|
- A - 4, B - 3, C - 2, D - 1
- A - 2, B - 1, C - 4, D - 3
- A - 2, B - 1, C - 3, D - 4
- A - 3, B - 2, C - 4, D - 1
- A - 1, B - 2, C - 3, D - 4
Which of the following microscopes is best for studying the process of mitosis cell cycle?
- Compound microscope
- Electron microscope
- Ultraviolet microscope
- Phase-contrast microscope
- Dark field microscope
Assertion (A): Some mycoplasmas (PPLO’S) are named as L-forms.
Reason (R): L-forms can be obtained by treating the bacterial cultures with enzymes like lysozyme or an antibiotic such as penicillin.
Directions: In the following question, there are two statements: Assertion (A) and Reason (R). Consider both the statements independently and mark your answer as:
1. If A and R both are correct and R is the correct explanation of A
2. If A and R both are correct and R is not the correct explanation of A
3. If A is correct and R is incorrect
4. If A is incorrect and R is correct
5. If A and R both are incorrect
- 1
- 2
- 3
- 4
- 5
The phenomenon of certain tissues and cell components showing colour other than their fundamental one is known as
- ultramicrotomy
- microtomy
- metachromasis
- cell fractionation
- tissue culture