Proteins are an important part of a healthy diet because they provide essential amino acids. (a) State what is meant by an essential amino acid.
There are 20 amino acids, and they can be classified as essential or non-essential – if they are non-essential they can be synthesised by the human body by itself, with no need to supplement them in the diet. If they are essential they cannot be synthesised by the body and must be obtained through dietary means.
DC
Related Chemistry A Level answers
All answers ▸What happens to the physical properties(solubility/boiling/melting point) as chain length increases, and as functional groups are added onto the chemical compound?
Explain, in the context of catalysis, the term heterogeneous and describe the first stage in the mechanism of this type of catalysis.
20cm3 of 0.5moldm-3 of HCL is diluted by adding 15cm3 of water. This diluted solution is titrated against a 0.3moldm-3 solution of NaOH. What is the volume of the NaOH in cm3 required to reach the endpoint of the titration?
24.3cm^3 of 0.02moldm-3 KMnO4 reacted with 20cm^3 of iron (II) solution. Calculate the molarity of the iron (II) solution.