1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
One turn of the helix in a B-form DNA is approximately -
A
20 nm
B
3.4 nm
C
2 nm
D
0.34 nm
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
One gene-one enzyme hypothesis was postulated by -
A
A.Garrod
B
Hershey and Chase
C
Beadle and Tatum
D
R. Franklin
3
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
4
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
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