What are biodegradable detergents?

The extraction and processing of crude oil is essential for the global economy but can have a serious environmental impact. Discuss the role of biochemistry in hydrocarbon waste management and the remediation of accidental oil spills.

The following table summarises the differences between biodegradable and non-biodegradable pollutants. Pick out the wrong differences and select the correct answer.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Label the hydrophilic and hydrophobic parts in the following compound.

$\mathrm{C}{\mathrm{H}}_3{\left(\mathrm{C}{\mathrm{H}}_2\right)}_{10}\mathrm{C}{\mathrm{H}}_2\mathrm{O}\mathrm{S}{\mathrm{O}}_3^{-}\mathrm{N}{\mathrm{a}}^{+}$

Name the enzyme helps in removing oil stains from clothes?

Describe the bonding between the components of host–guest supramolecules.

In environmental research the concentration of pollutants in the air is often reported in molecules per cubic cm. The air in the Ruhr area of Germany contains $3.3 \mathrm{ng} {\mathrm{m}}^{-3}$ of polychlorinated biphenyls (PCBs). Determine the concentration of PCBs over the Ruhr area in molecules per ${\mathrm{cm}}^3$ if the average molecular mass of PCBs is $320 \mathrm{g} {\mathrm{mol}}^{-1}$