Chemistry for Physiology

A buffer solution resists change to its pH. This means that its pH will change very little, but it will change slightly. As acid has been added, its pH will drop by a small amount.

While all of the elements represented by symbols in the four choices are non-metals, only choice C represents an element. All others are compounds.

Denaturation does not affect primary structure. That is, the sequence of amino acids within the polypeptide chain.

Our dietary lipids are in the form of triglycerols (a glycerol molecule and three fatty acids).

5.9% means that there is 5.9 g of alcohol per 100 ml of beer. “Percent” means “in a 100”.

The movement of these ions down their concentration gradient is diffusion. The concentration gradient is produced by the active transport of the Na+/ K+ ATPase pump.

Molecules are the particles of covalent compounds.

The blood has the ability to buffer normal intakes of acidic or basic substances. So excursions of blood pH outside the healthy range are prevented.

This is the only correct choice. However molecules may also form ions – polyatomic ions.

Different atomic numbers means different numbers of protons and hence different elements.