1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
In recent years, DNA sequences (nucleotide sequence) of mt-DNA and Y chromosomes were considered for the study of human evolution, because : -
A
They are uniparental in origin and do not take part in recombination
B
They can be studied from the samples of fossil remains
C
Their structure is known in greater detail
D
They are small, and therefore, easy to study
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Which one of the following bacteria has found extensive use in genetic engineering work in plants ?
A
Xanthomonas citri
B
Agrobacterium tumefaciens
C
Bacillus coagulens
D
Clostridium septicum
3
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Manipulation of DNA in genetic engineering became possible due to the discovery of : -
A
Transcriptase
B
DNA ligase
C
Primase
D
Restriction endonuclease
4
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
A mutant strain of T4 – Bacteriophage, R-II, fails to lyse the E-Coli but when two strains RIIX and R-IIY are mixed then they lyse the E.Coli. What may be the possible reason : -
A
Both strains have different cistrons
B
Both strains have simillar cistrons
C
It is not mutated
D
Bacteriophage transforms in wild
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