Thermococcus, Methanococcus and Methanobacterium exemplify
1. Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
2. Bacteria that contain a cytoskeleton and ribosomes
3. Archaebacteria that contain protein homologous to eukaryotic core histones
4. Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled

Consider the following regarding the reasons for the fact that now Cyanobacteria are kept in Monera and not in Plantae:

I. They are prokaryotes.
II. The cell wall of cyanobacteria has peptidoglycan.
III. They can fix atmospheric nitrogen.

The correct explanations would be:

1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Sterptomyces are important source of antibiotics. Match the various species of this bacterium in COLUMNN I with the antibiotics derived in COLUMN II and select the correct answer from the codes given below:

Codes
   A B C D
1. b a d c
2. a b d c
3. a b c d
4. b a c d

Zooxanthellae, symbionts with corals, belong to:
1. Desmids
2. Dinoflagellates
3. Ascomycetes
4. Cynobacteria

Match the name of scientist in Column I with the classification system in Column II and select the correct answer from the codes given:

Codes
   A B C D
1. a b c d
2. b a d c
3. a b d c
4. b a c d

Dolipore septum and clamp connections are features seen in the members of the fungal class:
1. Ascomycetes
2. Phycomycetes
3. Basidiomycetes
4. Deuteromycetes

The structure shown in the given diagram is related to:

1. Slime moulds
2. Sporozoans
3. Cyanobacteria
4. Mycoplasma

The given diagram shows the life cycle of:

1. Puccinia graminis tritici with A part representing the stages in wheat plant and B part representing the stages in Barberry plant
2. Puccinia graminis tritici with A part representing the stages in Barberry plant and B part representing the stages in wheat plant
3. Ustilago tritici with A part representing the stages in wheat plant and B part representing the stages in Barberry plant
4. Ustilago tritici with A part representing the stages in Barberry plant and B part representing the stages in wheat plant

Causing the Great Oxygenation Event and the "rusting of the Earth", which of the dramatically changed the composition of the Earth's life forms and led to the near-extinction of anaerobic organisms?
1. Cynobacteria
2. Diatoms
3. Dinoflagellates
4. Green algae

A phage with the following life cycle will be called as:

1. Temperate
2. Virulent
3. Prophage
4. Prion