If the vectors $p\hat{i} + \hat{j} + \hat{k}$,$\hat{i} + q\hat{j} + \hat{k}$,and $\hat{i} + \hat{j} + r\hat{k}$ $(p \neq q \neq r \neq 1)$ are coplanar,then find the value of $pqr - (p + q + r)$.

In a reaction $N_{2(g)} + 3H_{2(g)} \to 2NH_{3(g)}$,the rate of appearance of $NH_3$ is $2.5 \times 10^{-4} \, mol \, L^{-1} \, s^{-1}$. The rate of reaction and rate of disappearance of $H_2$ will be (in $mol \, L^{-1} \, s^{-1}$):

Which of the following enzymes hydrolyzes the internal phosphodiester bonds in a polynucleotide chain?

The major product in the following reaction is:

$A$ monoatomic gas is supplied heat $Q$ very slowly keeping pressure constant. The work done by the gas will be

Identify the pair of viral diseases.