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

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

Phylogenetic system of classification is based on
1. Floral Characters
2. Evolutionary relationships
3. Morphological features
4. Chemical constituents

Semiconservative replication of DNA was first demonstrated in
1. Salmonella typhimurium
2. Drosophila melanogaster
3. Escherichia coli
4. Streptococcus pneumoniae