1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia
A
can induce root nodules on many plant species
B
can fix nitrogen in the free-living state
C
cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids
D
like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex.
2
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
Phenetic classification of organisms is based on
A
observable characteristics of existing organisms
B
the ancestral lineage of existing organisms
C
dendrogram based on DNA characteristics.
D
sexual characteristics.
3
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
Which of the following statements is not true for retroviruses?
A
DNA is not present at any stage in the life cycle of retroviruses.
B
Retroviruses carry gene for RNA-dependent DNA polymerase.
C
The genetic material in mature retroviruses is RNA.
D
Retroviruses are causative agents for certain kinds of cancer in man.
4
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
A free living nitrogen-fixing cyanobacterium which can also symbiotic association with the water ferm Azolla is
A
Tolypothrix
B
Chlorella
C
Nostoc
D
Anabaena.
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