Question

Isotope used to determine the semiconservstive nature of dna

Answer 1

Explanation:

(B) Electric field due to line charge

Consider a long thin uniformly charged wire and we have to find the electric field intensity due to the wire at any point at perpandicular distance from the wire.

If the wire is very long and we are at point far away from both its ends then field lines outside the wire are radial and would lie on a plane perpandicular to the wire.

Answer 2

Explanation:

The semi-conservative model, in which each strand of DNA serves as a template to make a new, complementary strand, seemed most likely based on DNA's structure. The models were tested by Meselson and Stahl, who labeled the DNA of bacteria across generations using isotopes of nitrogen.