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1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
E. coli cells with a mustard z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because -
A
They cannot transport lactose from the medium into the cell
B
They cannot synthesize functional beta galactosidase
C
In the presence of glucose, E. coli cells do not utilize lactose
D
The lac operon is constitutively active in these cells
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Telomerase is an enzyme which is a -
A
RNA
B
Repetitive DNA
C
Simple protein
D
Ribonucleoprotein
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originates as adaptation. These imprints need to be used -
A
On plates with minimal medium
B
Only on plates with streptomycin
C
Only on plates without streptomycin
D
On plates with and without streptomycin
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Which one of the following hydrolyses internal phosphodiester bonds in a polynucleotide chain ?
A
protease
B
Endonuclease
C
Lipase
D
Exonuclease
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