Microbial Groups and Viral Classification - Microbial Taxonomy and Diversity - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2007

Q. 16-22 are matching exercises.
Choose the correct one from the alternatives A, B, C and D.

Group I (Name of the Fungus)	Group II (Class)
P. Agaricus sp.	1. Ascomycetes
Q. Pilobolus sp.	2. Deuteromycetes
R. Neurospora sp.	3. Phycomycetes
S. Rhizoctonia sp.	4. Actinomycetes
	5. Basidiomycetes
	6. Zygomycetes

A

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

B

P-4, Q-1, R-2, S-6

C

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

D

P-6, Q-1, R-3, S-5

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2

2007 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2007

Which of the following species shows a high resistance to radiation damage?

A

Deinococcus

B

Micrococcus

C

Staphylococcus

D

Planococcus

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3

2010 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2010

Bacterial cell lysis by lysozyme is due to the

A

hydrolysis of α-1,4-glycosidic bonds between the N-acetylglucosamine and N-acetylmuramic acid

B

inhibition of cell wall synthesis

C

hydrolysis of pentapeptide bridges

D

hydrolysis of β-1,4-glycosidic bonds between the N-acetylglucosamine and N-acetylmuramic acid

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4

2012 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2012

Transformation of normal cyanobacterial cells into heterocysts involves

A

synthesis of nitrogenase and retention of photosystem I

B

synthesis of nitrogenase and loss of photosystem I

C

loss of nitrogenase but retention of photosystem I

D

loss of both nitrogenase and photosystem I

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5

2014 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2014

Most viral capsids have

A

08 faces

B

12 faces

C

16 faces

D

20 faces

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6

2014 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2014

Match organisms in Group I with shapes in Group II and flagellar arrangements in Group III.

Group I
(P) Salmonella typhi
(Q) Saccharomyces cerevisiae
(R) Aquaspirillum serpens
(S) Vibrio cholerae

Group II
(i) helical
(ii) rod
(iii) curved rod
(iv) ovoid

Group III
(1) non-motile
(2) amphitrichous
(3) peritrichous
(4) polar

A

P-ii-3, Q-iv-1, R-i-2, S-iii-4

B

P-iii-1, Q-iv-2, R-ii-4, S-i-3

C

P-i-2, Q-ii-4, R-iii-2, S-iv-3

D

P-ii-2, Q-iii-1, R-i-3, S-iv-4

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7

2015 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2015

Lophotrichous bacteria have

A

one flagellum

B

a cluster of flagella at one or both ends

C

flagella that are spread evenly over the whole surface

D

a single flagellum at each pole

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8

2018 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2018

Accumulating evidence suggest that Domain Archaea is more closely related to Domain Eukarya than to Domain Bacteria. Which of the following properties are shared between eukaryotes and archaea ? (i) Protein biogenesis (ii) Presence of sterol containing membranes (iii) Ribosomal subunit structures (iv) Adaptation to extreme environmental conditions (v) Fatty acids with ester linkages in the cell membrane

A

(ii), (iii) and (v)

B

(i), (ii), (iv), and (v)

C

(i) and (iii)

D

(iii) and (iv)

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9

2018 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2018

Which of the following is a Gram positive bacteria?

A

Listeria monocytogenes

B

Proteus vulgaris

C

Salmonella typhi

D

Shigella dysenteriae

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10

2019 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2019

Microbes make up about __________ of earth’s living material by weight.

A

1/4th

B

2/3rd

C

3/4th

D

4/5th

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11

2019 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2019

The highly contagious viral disease measles is caused by a

A

double-stranded DNA virus

B

single-stranded DNA virus

C

single-stranded RNA virus

D

double-stranded RNA virus

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12

2019 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2019

Among the following characteristics listed below, select those that are the most appropriate for archaebacteria (i) Peptidoglycan containing muramic acid and D-amino acids are present in cell wall (ii) Long chain branched alcohols (phytanols) bound to glycerol by ether linkages are found in the lipids of cytoplasmic membrane (iii) First amino acid to initiate new polypeptide chain is N-Formylmethionine (iv) Translation process is sensitive to the action of diphtheria toxin

A

(i), (iii)

B

(ii), (iii), (iv)

C

(ii), (iv)

D

(i), (ii), (iv)

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13

2021 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2021

Nocardia spp. are not amenable to the classical method of Gram staining due to the presence of

A

N-acetylgalactosaminuronic acid in the cell wall.

B

thick peptidoglycan.

C

mycolic acid.

D

keto-deoxy-octulosonic acid.

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14

2023 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2023

Monkey pox is caused by a

A

double-stranded DNA virus

B

single-stranded DNA virus

C

double-stranded RNA virus

D

single-stranded RNA virus

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15

2023 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2023

Which of the following genus is/are a spirochete(s)?

A

Borrelia

B

Leptospira

C

Spirulina

D

Treponema

Check answer

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16

2024 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2024

Which of the following cocci is/are examples of division in one plane?

A

Staphylococci

B

Streptococci

C

Micrococci

D

Diplococci

Check answer

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17

2024 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2024

Which of the following is/are typical characteristic(s) of a fungal cell?

A

Presence of histone proteins

B

Presence of peptidoglycans in the cell wall

C

Presence of chitin in the cell wall

D

Presence of pseudomurein in the cell wall

Check answer

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18

2025 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2025

Correctly match the viruses listed in Column I with the nature of their corresponding genetic materials listed in Column II.

Column I	Column II
P. Bacteriophage lambda	i. dsDNA
Q. Bacteriophage M13	ii. ssDNA
R. Coronavirus	iii. ssRNA
S. Reovirus	iv. dsRNA

A

P - i; Q - iv; R - iii; S - ii

B

P - iv; Q - ii; R - i; S - iii

C

P - i; Q - ii; R - iii; S - iv

D

P - i; Q - iii; R - ii; S - iv

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19

2025 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2025

Which of the following statements regarding micro-organisms is/are correct?

A

The free-living bacterium Wolbachia is a human parasite.

B

Myxococcus are a group of predatory bacteria.

C

Dictyostelium is a slime mold that aggregates to form social groups.

D

Actinomycetes in soil are involved in producing earthy odours.

Check answer

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20

2026 · Life Sciences · Microbial Taxonomy and Diversity · Microbial Groups and Viral Classification

Life Sciences (XL) 2026

Which one of the following options correctly matches the microbial names in Column I with their corresponding sources of epithet in Column II?

Column I	Column II
(P) Klebsiella pneumoniae	(i) causes stupor in mice
(Q) Penicillium chrysogenum	(ii) forms pus
(R) Salmonella typhimurium	(iii) the disease it causes
(S) Streptococcus pyogenes	(iv) produces a yellow pigment

A

P-i; Q-ii; R-iii; S-iv

B

Q-i; R-ii; S-iii; P-iv

C

R-i; S-ii; P-iii; Q-iv

D

S-i; Q-ii; P-iii; R-iv

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