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

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

Which of the following will not be true for archaebacteria?
1. Methanobacteriales do have cell walls containing pseudopeptidoglycan
2. Branched chained lipids in cell membrane may help prevent archaeal membranes from leaking at high temperatures
3. Although archaea only have one type of RNA polymerase, its structure and function in transcription seems to be close to that of the eukaryotic RNA polymerase II
4. Like true bacteria the genes in archaea also lack any introns