Single-celled eukaryotes are included in 

(a) Protista                   (b) Fungi

(c) Archaea                  (d) Monera

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

Consider the following four measures (A-D) that could be taken to successfully grow chick pea in an area where bacterial blight disease is common

(A) spray with Bordeaux mixture

(B) control of the insect vector of the disease pathogen

(C) use of only disease-free seeds

(D) use of varieties resistant to the disease

Which two of the above measures can control the disease?

(1) B and C

(2) A and B

(3) C and D

(4) B and D

Bacterial leaf blight of rice is caused by a species of

(1) Xanthomonas

(2) Pseudomonas

(3) Alternaria

(4) Erwinia

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

(1) Archaea resemble eukarya in all respects

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

(3) Archaea completely differ from both prokaryotes and eukaryotes

(4) Archaea completely differ from prokaryotes