Which of the following statements about viruses is correct ?
1. Viruses contain either DNA or RNA
2. Viruses possess their own metabolic system
3. Viruses are facultative parasites
4. Viruses are readily killed by antibiotics

Bacterial flagella are formed of
1. Amines
2. Proteins
3. Lipids
4. Carbohydrates

Barophilic prokaryotes
1. Occur in water containing high concentration of barium hydroxide
2. Grow slowly in alkaline frozen lakes at high altitude
3. Grow and multiply in very deep marine sediments
4. Readily grow and divide in sea water enriched with soluble salt of barium

Crown gall disease of plants is caused by
1. Ti-plasmid
2. Pi-plasmid
3. Virus
4. Protozoan

Auxospores and hormocysts are formed respectively by
1. Some diatoms and several cyanobacteria
2. Some cyanobacteria and several diatoms
3. Several cyanobacteria and several diatoms
4. Several diatoms and few cyanobacteria

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread?

Choose the answer from the following options:

Which pair belongs to basidiomycetes?

Which of the following is a filamentous nitrogen fixing bacterium is present in root nodules of non-leguminous plant?
1. Cicer arietinum
2. Casurina equisetifolia
3. Cycas revoluta
4. Crotalaria juncea

Which is wrong about mycoplasma?
1. They are called PPLO
2. They are pleomorphic
3. They are sensitive to penicillin
4. They cause diseases in plants

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea
1. Archaea completely differ from both prokaryotes and eukaryotes
2. Archaea completely differ from prokaryotes
3. Archaea resemble eukarya in all respects
4. Archaea have some novel features that are absent in both prokaryotes and eukaryotes