MCQs on Archaebacteria for NEET 2020

Archaebacteria is a type of single-celled entity which differs from other modern life-forms.They are a group of microbes deemed to be an ancient life-form which are known to have evolved separately from blue-green algae and bacteria.

1. Some bacteria thrive in extreme environment conditions such as absence of oxygen, high salt concentration, high temperature and acidic pH. It is

(a) Eubacteria

(b) Cyanobacteria

(c) Archaebacteria

Answer: (c)

2. This about archaebacteria is true

(a) All halophiles

(b) all photosynthetic

(c) old living entities

(d) all fossils

Answer: (c)

3. Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups called

(a) Cyanobacteria and Diatoms

(b) Liverworts And Yeasts

(c) Protists And Mosses

(d) Eubacteria And Archaea

Answer: (d)

4. This is found in extreme saline conditions

(a) eubacteria

(b) cyanobacteria

(c) archaebacteria

(d) mycobacteria

Answer: (c)

5. Most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorized as

(a) heterotrophic bacteria

(b) archaebacteria

(c) cyanobacteria

(d) chemosynthetic autotrophs

Answer: (a)

6. Methanogens belong to

(a) slime moulds

(b) dinoflagellates

(c) eubacteria

(d) archaebacteria

Answer: (d)

7. Archaebacteria is different from eubacteria in having

(a) cell shape

(b) mode of reproduction

(c) mode of nutrition

(d) cell membrane structure

Answer: (d)

8. Methanococcus, Thermococcus and Methanobacterium exemplify

(a) bacteria that contain a cytoskeleton and ribosomes

(b) bacteria whose DNA is relaxed or positively supercoiled but which have a

cytoskeleton as well as mitochondria

(c) archaebacteria that lack any histones resembling those found in eukaryotes but

whose DNA is negatively supercoiled

(d) archaebacteria that contain protein homologous to eukaryotic core histones

Answer: (c)

9. After the new classification of living organisms into three domains of life (bacteria, archaea and eukarya) which one of the following is true about archaea?

Archaea ____________

(a) completely differ from prokaryotes

(b) completely differ from both eukaryotes and prokaryotes

(c) have some novel features that are absent in other eukaryotes and prokaryotes

(d) resemble eukarya in all respects

Answer: (c)

10. Which of the following are likely to be present in deep sea water

(a) eubacteria

(b) archaebacteria

(c) saprophytic fungi

(d) blue-green algae

Answer: (b)

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