WorksheetsIB 1.2 Proteins
Total questions: 20
Worksheet time: 18mins
Which statement best explains why proteins are polymers that can have such a large range of structures?
Each individual cell has a unique proteome.
Each protein can be folded into many different three-dimensional shapes.
All proteins are polymers of an amino acid.
There are twenty kinds of amino acids that can be used as monomers for polypeptides.
Which of the following contribute to the almost infinite variety of peptide chains?
I. The sequence of amino acids in the peptide chain.
II. The peptide bonds in the polypeptide chain.
III. The types of carbohydrate monomers in the peptide chain.
IV. Mutations in protein structure.
All of the above.
I, II and III only.
I only.
I and IV only
Which is the most accurate description of, “denaturation”?
The effect of temperature on proteins.
The change in properties of peptides.
The change in structure of a peptide.
The effect of pH on protein structure.
Draw a diagram to show a generalized dipeptide formed from two amino acids.
Outline the relationship between the genetic code and the structure of a protein
Outline the importance of essential amino acids in the diet of a human.
What is the primary role of chaperone proteins in relation to polypeptides?
To catalyze peptide bond formation.
To assist in the proper folding of proteins.
To transport amino acids to ribosomes.
To degrade misfolded proteins.
Which factor is least likely to affect the stability of a protein's structure?
pH levels.
Presence of heavy metals.
Color of the protein.
Temperature changes.
What is the significance of the primary structure of a protein?
It is the arrangement of multiple polypeptide chains.
It refers to the three-dimensional shape of the protein.
It is the sequence of amino acids in the polypeptide chain.
It determines the protein's function.
Which of the following is NOT part of a generalized amino acid structure?
Amino group (-NH₂)
Carboxyl group (-COOH)
Phosphate group (-PO₄³⁻)
Hydrogen atom (-H)
What part of the amino acid determines its unique properties?
Alpha carbon
R-group
Amino group
Carboxyl group
How are amino acids linked together?
Hydrolysis reaction
Condensation reaction
Oxidation reaction
Reduction reaction
What type of bond is formed between amino acids?
Glycosidic bond
Peptide bond
Hydrogen bond
Disulfide bond
Which of the following is NOT an example of a protein or polypeptide?
Lysozyme
Alpha-neurotoxin
Starch
Glucagon
What happens to proteins at high temperatures?
They undergo condensation.
They become more structured.
They denature due to hydrogen bond breakdown.
They form new bonds to stabilize their structure.
State the reaction required to link two amino acids together
(a)
How many different amino acids are found in the proteins of living organisms?
(a)
Identify the molecule
(a)
State the term for proteins that act as biological catalysts.
(a)
Identify the reaction
(a)
