Botany Biological Classification questions from NEET UG 2010.
Some hyperthermophilic organisms that grow in highly acidic ( $\mathrm{pH} 2$ ) habitats belong to the two groups called
Infectious proteins are present in
Single-celled eukaryotes are included in
Membrane-bound organelles are absent 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 ?  
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.