Organisms called Methanogens are most abundant in a

(1) cattle yard

(2) polluted stream

(3) hot spring

(4) sulphur rock

Which one of the following organisms is not an example of eukaryotic cells?

(1) Escherichia coli

(2) Euglena viridis

(3) Amoeba proteus

(4) Paramecium caudatum

Which one of the following is wrongly matched?

Single-celled eukaryotes are included in 

Membrane-bound organelles are absent in

(1) Saccharomyces

(2) Streptococcus

(3) Chlamydomonas

(4) Plasmodium

Virus envelope is known as

(1) capsid

(2) virion

(3) nucleoprotein

(4) core

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

(1) eubacteria and archaea

(2) cyanobacteria and diatoms

(3) protists and mosses

(4) liverworts and yeasts

Infectious proteins are present in

(1) gemini viruses

(2) prions

(3) viroids

(4) satellite viruses

Oxygenic photosynthesis occurs in

(1) Chromatium

(2) Oscillatoria

(3) Rhodospirillum

(4) Chlorobium

T. O. Diener discovered a

(1) free infectious RNA

(2) free infectious DNA

(3) infectious protein

(4) bacteriophage