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
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
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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:
|
COLUMN I |
|
COLUMN II |
A |
S. griseus |
a |
Chloromycetin |
B |
S. venezualae |
b |
Streptomycin |
C |
S. rimosus |
c |
Erythromycin |
D |
S. eryhtreus |
d |
Terramycin |
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:
|
COLUMN I |
|
COLUMN II |
A. |
Copeland |
a. |
Three Kingdom |
B. |
Haeckel |
b. |
Four Kingdom |
C. |
Ruggiero |
c. |
Three domain |
D. |
Woose |
d. |
Seven kingdom |
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