DNA polymerase I of E.coli is a single polypeptide of molecular weight 109,000 (a) What enzymatic activity other than polymerase activity does this polypeptide possess? (b) What are the in vivo function of these activities?

What is the source of DNA polymerase i.e. Taq polymerase?

What functions does hypothalamus serve in co-ordinating various activities of the body?

What is the fraction of molecules having energy equal to or greater than activation energy, E_a ? What is this quantity called ?

For a reaction A overset (k) rarr product, the reaction occurs as : A overset (k_1) rarr A^(**) overset (k_2) rarr B^(**) overset (k_3) rarr product The overall rate constant k is given as: k= 2k_1 (k_2/k_3)^(2//3) If E_(a1) , E_(a2) and E_(a3) are the activation energies of these steps, then what is the relation between overall activation energy E_(a) and the activation energies of these steps.

Radioactive disintegration is a first order reaction and its rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure. The rate of radioactive disintegration (Activity) is represented as -(dN)/(dt)=lambdaN Where lambda= decay constant, N= number of nuclei at time t, N_(0) =intial no. of nuclei. The above equation after integration can be represented as lambda=(2.303)/(t)log((N_(0))/(N)) What is the activity in Ci (curie) of 1.0mole plutonium -239 ? (t_(1//2)=24000 years) a) 1.49 Ci b) 14.9 Ci c) 5.513xx10^(11) Ci d) None of these

The half-life of Tc^(99) is 6.0 hr. The total residual activity in a patient 30 hr after receiving an injection containing Tc^(99) must be more than 0.01 muC_(i) . What is the maximum activity ("in"muC_(i)) that the sample injected can have? a) 0.16 b) 0.32 c) 0.64 d) 0.08

A catalyst lowers the activation energy for a certain reaction from 83.314 to 75 KJ "mol"^(-1) at 500 K . What will be the rate of reaction as compared to uncatalyst reaction ? Assume other things being equal a) Double b) 28 times c) 7.38 times d) 7.38 xx 10^(3) times