Chemistry for Biologists

Proteins

1. Which word best describes proteins that are enzymes and immunoglobins:
coiled
linear
pleated
globular
2. Proteins that have a quaternary structure have:
two or more proteins bonded together
a protein and a nucleic acid bonded together
a protein and a carbohydrate bonded together
a protein and a lipid bonded together
3. The sequence of amino acids in a protein is called its:
quaternary structure
tertiary structure
secondary structure
primary structure
4. Which of the following types of bond is not present within or between protein molecules:
ionic bonds
hydrogen bonds
covalent bonds between sulphur atoms
covalent bonds between oxygen atoms
5. The type of bond holding the amino acid units together in a dipeptide molecule is called:
an ester bond
a peptide bond
a protein bond
a glycosidic bond
6. Proteins are broken down into their amino acids by:
an addition reaction
a polymerisation reaction
a decomposition reaction
a hydrolysis reaction
7. Two amino acid molecules combine to form a dipeptide molecule. The reaction that occurs is:
an oxidation reaction
a hydrolysis reaction
an esterification reaction
a condensation reaction
8. Essential amino acids can be:
made from amines
made from non-essential amino acids
made in the body
obtained by eating the correct food
9. All amino acids have the following pair of functional groups:
carboxylic acid and an amine
amine and an ester
alcohol and carboxylic acid
amine and alcohol

 

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