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Microbiology

Description: Microbiology Microbial Diversity and Characteristic Features; VirusesMicrobial MetabolismProkaryotic and Eukaryotic Cell StructureMicrobiologyMicrobial Genetics Nitrogen fixation
Number of Questions: 18
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Tags: Microbiology Microbial Diversity and Characteristic Features; Viruses Microbial Metabolism Prokaryotic and Eukaryotic Cell Structure Microbial Genetics Nitrogen fixation
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Which of the following is an example of hyperthermophilic bacteria?

  1. Anaerobaculum

  2. Sulfobacillus

  3. Pyrodictium

  4. Salmonella

  5. Listeria


Correct Option: C
Explanation:

Yes, it is the correct answer. Pyrodictium is a genus of submarine hyperthermophilic archaea whose optimal growth temperature ranges is 80 to 105°C.

Which of the following genera of mollicutes does not exhibit fermentation metabolism?

  1. Mycoplasma

  2. Spiroplasma

  3. Anaeroplasma

  4. Ureaplasma

  5. Acholeplasma


Correct Option: D
Explanation:

Ureaplasma exhibits respiratory metabolism.

Which of the following statements are TRUE regarding prokaryotic cell? P. Prokaryotic cells are larger in size than eukaryotic cells. Q. Lysosomes are present. R. Site for oxidative phosphorylation is cell membrane. S. Ribosomal subunits are 50S and 30S.

  1. Only P and Q

  2. Only P and S

  3. Only Q and R

  4. Only Q and S

  5. Only R and S


Correct Option: E
Explanation:

Yes, both are true. Site for oxidative phosphorylation in prokaryotic cells is cell membrane. Cytoplasmic ribosome size of prokaryotic cells is 70S. Ribosomal subunits are 50S and 30S.

Which of the following pairs of bacteria shows negative Voges-Proskauer test?

  1. Escherichia coli and Enterobacter aerogenes

  2. Escherichia coli and Klebsiella pneumoniae

  3. Enterobacter aerogenes and Proteus mirabilis

  4. Escherichia coli and Proteus mirabilis

  5. Enterobacter aerogenes and Klebsiella pneumoniae


Correct Option: D
Explanation:

Yes, it is correct. Voges–Proskauer test is used to detect acetoin in bacterial broth culture. The test is performed by adding alpha-naphthol and potassium hydroxide to the Voges-Proskauer broth, which has been inoculated with bacteria. A cherry red colour indicates a positive result, while a yellow-brown colour indicates a negative result. Both Escherichia coli and Proteus mirabilis give negative Voges–Proskauer test.

Which of the following antibiotics acts by inhibiting the cell wall synthesis?

  1. Metronidazole

  2. Amikacin

  3. Erythromycin

  4. Amoxicillin

  5. Trimethoprim


Correct Option: D
Explanation:

Yes, it is the correct answer. Amoxicillin acts by inhibiting bacterial cell wall synthesis.

Which of the following is a nitrogen-fixing bacteria living in a symbiotic relationship with legumes?

  1. Clostridium

  2. Nitrosomonas

  3. Azotobactor

  4. Rhizobium

  5. Bacillus ramosus


Correct Option: D
Explanation:

Yes, it is the correct answer. Rhizobium is a nitrogen-fixing bacteria living in a symbiotic relationship with legumes.

Single stranded DNA is found in

  1. Coliphage fd
  2. T2 coliphage
  3. S-13 coliphage
  1. Only 1 and 2

  2. Only 1 and 3

  3. Only 2 and 3

  4. All of these

  5. None of these


Correct Option: B
Explanation:

It is a correct answer, as both fd coliphage and S-13 coliphage have single stranded DNA.

Which of the following is a pair of barophilic bacteria?

  1. Photobacterium profundum and Colwellia psychrerythraea

  2. Escherichia coli and Schewenella benthica

  3. Colwellia psychrerythraea and Helicobacter pylori

  4. Escherichia coli and Photobacterium profundum

  5. Helicobacter pylori and Schewenella benthica


Correct Option: A
Explanation:

Yes, it is the correct answer. Barophiles (barophilic bacteria) are bacteria which grow preferentially or exclusively at moderately high hydrostatic pressures. Examples: Photobacterium profundum and Colwellia psychrerythraea

Which of the following statements are FALSE regarding fungi?

  1. Food materials are stored in the form of starch.
  2. The cell wall is made up of chitin.
  3. Fungi are always autotrophs.
  4. Thallus is made up of pseudo parenchyma.
  1. Only 1 and 2

  2. Only 1and 3

  3. Only 1and 4

  4. Only 2 and 3

  5. Only 3 and 4


Correct Option: B
Explanation:

Yes, it is correct, as both are false. In fungi, food materials are stored in the form of glycogen, and fungi are heterotrophs due to absence of chlorophyll.

Which of the following is only a set of neutrophiles?

  1. Alicyclobacillus, Ferroplasma and Sulfolobus

  2. Escherichia, Euglena and Paramecium

  3. Escherichia, Picrophilus and Sulfolobus

  4. Paramecium, Ferroplasma and Picrophilus

  5. Euglena, Paramecium and Natronobacterium


Correct Option: B
Explanation:

It is the correct answer. All are neutrophiles. Escherichia, Euglena and Paramecium, all are Neutrophiles (optimum growth between pH 5.5 and 8.0).

Which of the following statements are TRUE? P. The site for detoxification reaction in liver is SER. Q. The principal protein of cilia and flagella is tubulin. R. Centrosome is responsible for initiation of cell division. S. Acrosomes are produced by nucleolus.

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only Q and S


Correct Option: B
Explanation:

It is correct as both the statements are true.

Match the entries in column I (Cell organelle) and column II (Discoverer)

 
Column - I
Column - II
P. Ribosome 1. Fontana
Q. Lysosome 2. Duve
R. Centrosome 3. Palade
S. Nucleolus 4. Boveri
  1. P - 1, Q - 2, R - 3, S - 4

  2. P - 1, Q - 3, R - 4, S - 2

  3. P - 2, Q - 4, R - 3, S - 1

  4. P - 3, Q - 2, R - 4, S - 1

  5. P - 4, Q - 3, R - 2, S - 1


Correct Option: D
Explanation:

Yes, it is correct. Ribosomes were discovered by George E. Palade. Lysosomes were discovered by Christian de Duve. Centrosomes were discovered by Theodor Boveri. Nucleolus was discovered by Felice Fontana.

Match the entries in List I (Cell organelle) and List II (Discoverer)

 
List - I
List - II
P. Chondriosomes 1. R. Altman
Q. Centrosome 2. Edouard Van Beneden
R. Microtubules 3. De Robertis and Franchi
S. Vacuoles 4. Antony van Leeuwenhoek
  1. P - 1, Q - 2, R - 3, S - 4

  2. P - 2, Q - 1, R - 4, S - 3

  3. P - 2, Q - 3, R - 4, S - 1

  4. P - 3, Q - 2, R - 4, S - 1

  5. P - 4, Q - 2, R - 3, S - 1


Correct Option: A
Explanation:

Yes, it is correct. Mitochondria, at times referred to as chondriosomes, were discovered by R. Altman. Centrosome was discovered by Edouard Van Beneden. Microtubules were first discovered by De Robertis and Franchi. Vacuoles are believed to have been discovered by Antony van Leeuwenhoek.

Which of the following plant diseases are caused by fungus? P. Ergot of Rye Q. Powdery mildew of cucurbits R. Crown gall of hemp S. Black rot of crucifers

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S


Correct Option: A
Explanation:

Yes, both are caused by fungus. Ergot of Rye is a plant disease that is caused by the fungus Claviceps purpurea. Powdery mildew of cucurbits is caused by two fungus: Sphaerotheca fuliginea and Erysiphe cichoracearum.

Which of the following statements is/are FALSE regarding mitochondria?

  1. Mitochondria are a cell organelle which has electrons transport system.
  2. Synthesis of ATP in mitochondria takes place at the cristae.
  3. The enzymes for Kreb’s cycle in mitochondria are located in perimitochondrial space.
  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1and 2

  5. Only 2 and 3


Correct Option: C
Explanation:

It is a correct answer, as statement 3 is false. The enzymes for Kreb’s cycle in mitochondria are located in mitochondrial matrix.

Which of the following is a set of single membrane bounded organelles?

  1. Ribosome, Nucleolus, and Chromosome

  2. Ribosome, Nucleolus, and Lysosome

  3. Nucleolus, Endoplasmic Reticulum, and Golgi complex

  4. Lysosome, Ribosome and Chromosome

  5. Endoplasmic Reticulum, Golgi complex, and Lysosome


Correct Option: E
Explanation:

Endoplasmic Reticulum, Golgi complex, and Lysosome, all are single membrane bounded organelles.

Match the column – I (Disease) with column – II (Causative agent)

 
Column – I
Column – II
A. Red rot disease of sugarcane 1. Ustilago hordei
B. Covered smut of barley 2. Colletotrichum falcatum
C. Wheat leaf rust 3. Puccinia triticina
D. Coffee leaf rust 4. Hemileia vastatrix
  1. A - 4, B - 3, C - 2, D - 1

  2. A - 2, B - 1, C - 4, D - 3

  3. A - 2, B - 1, C - 3, D - 4

  4. A - 3, B - 2, C - 4, D - 1

  5. A - 1, B - 2, C - 3, D - 4


Correct Option: C
Explanation:

Yes, it is the correct answer. Red rot disease of sugarcane is caused by fungus Colletotrichum falcatum. Covered smut of barley is caused by the fungus Ustilago hordei. Wheat leaf rust is the most common rust disease of wheat. It is caused by fungus Puccinia triticina. Coffee leaf rust is caused by Hemileia vastatrix.

Assertion (A): Chloroplasts have their own DNA as genetic material. Reason (R): Chloroplasts synthesise their own fatty acids, amino acids, and lipid components.

Directions: In the following question there are two statements, Assertion (A) and Reason (R), consider both the statements independently and mark your answers as under:
1. If A and R both are correct and R is correct explanation of A.
2. If A and R both are correct and R is not 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. Choice 1

  2. Choice 2

  3. Choice 3

  4. Choice 4

  5. Choice 5


Correct Option: B
Explanation:

It is the correct answer. Both are correct statements, but R is not a correct explanation for A. Chloroplasts have their own DNA as genetic material and they synthesise their own fatty acids, amino acids, and lipid components.

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