Tag: bacteria; benefits and harmful effects

Questions Related to bacteria; benefits and harmful effects

Bacteria are-

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Aerobic

  2. Non-aerobic

  3. Aerobic and non aerobic both

  4. None of the above

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Correct Option: A

Oidia resemble yeast in?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Fermentation

  2. Sexual reproduction

  3. Being diploid

  4. All of these

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Correct Option: A

Select the wrong statements.
A. Pyruvic acid decarboxylase and alcohol dehydrogenase catalyse fermentation.
B. $NADH+H^+$ is reoxidised to $NAD^+$ in alcohol and lactic acid fermentation.
C. Yeasts poison themselves to death when the concentration of alcohol reaches about $31$ percent.
D. Prolonged fermentation results greater alcohol contents in alcohol beverages.

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. C and D

  2. A and B

  3. B and C

  4. A and D

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Correct Option: A

Bacterial genome consist of 

botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Circular, ssRNA

  2. Circular, dsDNA

  3. Linear, triple stranded DNA

  4. zig-zag DNA

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Correct Option: B
Explanation:

Bacterial genome as that of a bacteria E.coli consists of Double-stranded DNA (ds DNA) which is circular which means it doesn't have ends like eukaryotic chromosomes. E.coli consists of 4.6 x 10$^6$ base pairs(bp).

So, the correct answer is 'Circular, dsDNA'.

The meiospores of yeast are nonmotile and called?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Aeciospores

  2. Aplanospores

  3. Ascospores

  4. Basidispores

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Correct Option: A

Which of the following microtubule arrangement is absent in the kinetosome of eukaryotic flagella?

botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. 9+0

  2. 9+2

  3. Both of the above

  4. None of the above

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Correct Option: B
Explanation:
  • Eukaryotic cilia and flagella have similar organization-
  • They possess a central bundle of microtubules called the axoneme which contain nine outer doublet microtubules surrounded by a central pair of singlet microtubules.
  • This characteristic 9 + 2 arrangement of microtubules is seen when the axoneme of eukaryotic flagella.
  • The correct answer is OPTION B.

The bacterial cell wall is made up of 

botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Cellulose

  2. Hemicellulose

  3. Cellulose and hemicellulose

  4. Peptidoglycan

  5. Glycogen

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Correct Option: D
Explanation:

Peptidoglycans (or mucopeptide or glycopeptide or murein) are the structural elements of almost all bacterial cell walls. They constitute as much as 95% of the cell wall in some Gram positive bacteria to as little as 5 to 10% in Gram negative bacteria. Peptidoglycans are made up of a polysaccharide backbone consisting of alternating muramic acid and glucose amine residues in equal amounts.

Match the contents of Column-I with of Column-II.

Colum-I Column-II
A Monascus purpurens i Statins
B Aspergillus niger ii Cyclosporin-A
C Trichoderma polysporum iii Citric acid
botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. A-i, B-ii, C-iii

  2. A-i, B-iii, C-ii

  3. A-iii, B-i, C-ii

  4. A-ii, B-i, C-iii

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Correct Option: A

The bacteria which lacks flagella and moves by gliding are included in?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Spirochetes

  2. Rickettsia

  3. Myxobacteria

  4. Eubacteria

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Correct Option: A

Bacteroides are?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Enlarged non-motile cellular bacteria Rhizobium leguminosarum in root nodules of legumes

  2. A bacterial cell infected with viruses

  3. A motile bacterium

  4. Nitrosomonas bacteria in soil

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Correct Option: A