The correct answer is ( c) Jacob and Monod.
The lac operon is an operon in Escherichia coli and other bacteria that is responsible for lactose transport and metabolism. Francois Jacob and Jacque Monad first described the mechanisms of regulation of expression of genes responsible for coding the involved enzymes while working on an inducible system for synthesis of beta-galactosidase enzyme in E. coli. An operon, according to the model, is made up of operator and structural genes. The operator gene controls the expression of structural genes by providing a binding site for transcription factors, which in turn control gene expression by altering RNA polymerase binding to the promoter region.
Operon model was proposed by
(A)Watson and Crick
(B) Nirenberg
(C) Jacob and Monad
(D) none of these
(A)Watson and Crick
(B) Nirenberg
(C) Jacob and Monad
(D) none of these
Operon model was proposed by
(A)Watson and Crick
(B) Nirenberg
(C) Jacob and Monad
(D) none of these
(A)Watson and Crick
(B) Nirenberg
(C) Jacob and Monad
(D) none of these
.
)
west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be 
Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points 
and 
carrying currents of 
and 
in the same direction are separated by a distance of 
. Estimate the force on a 
section of wire A.
wire carrying a current of 
is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 
. What is the magnetic force on the wire?
and making an angle of 
with the direction of a uniform magnetic field of 
. What is the magnitude of the field 
at a point 
from the wire?
-turns carrying current 
.
is at distance 
from the wire. Find the force acting on the electron if its velocity is directed towards the wire.