NEET UG 2010 — Biological Classification

Some hyperthermophilic organisms that grow in highly acidic ( $\mathrm{pH} 2$ ) habitats belong to the two groups called

Infectious proteins are present in

Given below is the diagram of a bacteriophage. In which one of the OPTIONs, all the four parts A, B, C and D are correct ?  

Membrane-bound organelles are absent in

Virus envelope is known as

Select the correct combination of the statements (A-D) regarding the characteristics of certain organisms. A. Methanogens are Archaebacteria, which produce methane in marshy areas. B. Nostoc is a filamentous blue-green algae, which fixes atmospheric nitrogen. C. Chemosynthetic autotrophic bacteria synthesize cellulose from glucose. D. Mycoplasma lack a cell wall and can survive without oxygen.

Single-celled eukaryotes are included in