Which one of the following structures between two adjacent cells is an effective transport pathway?

The monomers of $Buna-S$ rubber are

If $\tan A$ and $\tan B$ are the roots of the quadratic equation $x^2-px+q=0$,then $\sin^2(A+B)$ is equal to

Which of the following is a bacterial domain?

Two metal wires of identical dimensions are connected in series. If $\sigma_{1}$ and $\sigma_{2}$ are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

Which one of the following population interactions is widely used in medical science for the production of antibiotics?