Archaea

Q.

Do archaebacteria have a cell wall?

Q.

What are 2 examples of archaebacteria?

Q. in which aspect do archaebacteria differ from other bacteria?

1. cell membrane
2. cell wall
3. plasmalemma
4. ribosomes

Q. Which of the following are found in extreme saline conditions?

1. Archaebacteria
2. Eubacteria
3. Cyanobacteria
4. Mycobacteria

Q.

The phenomenon of red tides in the sea is caused by

1. Dinoflagellates

2. Red algae

3. Dead bacteria

4. Fungi

Q.

Respiratory enzymes in a bacterium are found associated with:

1. DNA

2. Plasma membrane

3. Mitochondria

4. Cell wall

Q. Thermococcus and Halobacterium

1. have membrane bound cell organelles
2. have 80S ribosomes
3. lack peptidoglycan in their cell wall
4. cannot live in extreme environmental conditions

Q.

In the light of the recent classification of living organisms into three domains of life (bacteria, archaea, and eukarya), which one of the following statements is true about archaea?

1. archaea completely differ from both prokaryotes and eukaryotes

2. archaea have some novel features that are absent in other prokaryotes and eukaryotes

3. archaea resemble eukarya in all respects

4. archaea completely differ from prokaryotes

Q.

Give the characteristics of eubacteria.

Q. Archaebacteria are special since they live in some of the most harsh habitats such as

1. Marshy areas
2. All of the above.
3. Hot springs
4. Extreme salty areas

Q.

What are the 2 domains of prokaryotes?

Q. Which of the following is a eukaryotic biofertilizer?

1. Anabaena
2. Rhizobium
3. Azotobacter
4. Glomus

Q. Biogas is produced by:

1. Cyanobacteria
2. Mycoplasma
3. None of the above
4. Archaebacteria

Q.

Are methanogens and halophiles the same kind of archaebacteria?

Q. Biogas generation is a three stage anaerobic digestion of animal and other organic wastes. Study the following flow chart and select the correct option of stage I, II and III.

1. In stage-I facultative anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers
2. In stage-II, monomers are converted into organic acids by fermentation causing microbes
3. In stage-III organic acids are acted upon by methanogenic bacteria to produce biogas
4. All of these

Q.

Do bacteria have cytochrome C?

Q. Arrange the given steps of biogas production in the correct order.
I - Action of fermentative microbes on monomeric units of complex organic compounds.
II - Action of methanogens on organic acids to produce methane and carbon dioxide
III - Action of facultative anaerobic decomposers on organic compounds such as cellulose, proteins, fats, etc.

1. $III\to I\to II$
2. $II\to III\to I$
3. $I\to III\to II$
4. $III\to II\to I$

Q. Study the image of a biogas plant given below and answer the questions that follow:


Arrange the given steps of biogas production in the correct order.

I - Action of fermentative microbes on monomeric units of complex organic compounds
II - Action of methanogens on organic acids to produce methane and carbon dioxide
III - Action of facultative anaerobic decomposers on organic compounds such as cellulose, proteins, fats, etc.
[1 mark]

1. III → I → II
2. II → III → I
3. I → III → II
4. III → II → I

Q.

What is unique about archaebacteria?

Q.

How do the two domains of prokaryotes differ?

Q. Archaea usually grow in a few restricted or specialized habitats, such as

1. anaerobic
2. hypersaline
3. extremely hot and cold
4. all of these

Q.

Many archaea are termed as

1. Neutrophiles

2. Thermophiles

3. Halophiles

4. Methanogens

Q.

The word archaea means

1. Ancient

2. Extreme conditions

3. Organisms with no symmetry'

4. All of the above

Q. Name the three Domain of organisms proposed by Woese

Q.
How are Archea different from Bacteria

1. can form Methane
2. have different rRNA sequences
3. do not have peptidoglycan in their cell walls
4. all of these are correct

Q. what is the function of akinete and heterocyst?

Q. Biogas is produced by :

1. With the help of methanogenic bacteria
2. Both (B) and (C)
3. Anaerobic breakdown of biomass
4. Aerobic breakdown of biomass

Q. Which one of the following is incorrectly matched?

1. Archaebacteria - algal blooms
2. Mycorrhizae - mineral uptake from soil
3. Yeast - Ethanol production
4. Lichens - Pioneers of plant succession

Q. Which one of the following is incorrectly matched?

1. Archaebacteria - algal blooms
2. Mycorrhizae - mineral uptake from soil
3. Yeast - Ethanol production
4. Lichens - Pioneers of plant succession

Q. Organisms called methanogens are most abundant in a :

1. Hot spring
2. Sulphur rock
3. Cattle yard
4. Polluted stream