Practise IB Biology SL B1.2.3 by distinguishing essential from non-essential amino acids and using diet, synthesis and deficiency evidence.
Some of the twenty amino acids that are linked together to make polypeptides in human cells are essential in the diet and others are not. Distinguish between essential and non-essential amino acids.
a. essential amino acids cannot be synthesized (by human cells)
OR essential amino acids are required to be obtained by diet / OWTTE;
b. non-essential amino acids can be made (from other amino acids);