Single-celled eukaryotes are included in 

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

Virus envelope is known as

(1) capsid

(2) virion

(3) nucleoprotein

(4) core

T. O. Diener discovered a

(1) free infectious RNA

(2) free infectious DNA

(3) infectious protein

(4) bacteriophage

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

(1) Escherichia coli

(2) Euglena viridis

(3) Amoeba proteus

(4) Paramecium caudatum

Which one of the following is wrongly matched?

Infectious proteins are present in

(1) gemini viruses

(2) prions

(3) viroids

(4) satellite viruses

Membrane-bound organelles are absent in

(1) Saccharomyces

(2) Streptococcus

(3) Chlamydomonas

(4) Plasmodium

Oxygenic photosynthesis occurs in

(1) Chromatium

(2) Oscillatoria

(3) Rhodospirillum

(4) Chlorobium