Lesson 18B.4
18B.4 Proteins and the peptide bond Quiz: Pearson Edexcel Chemistry, Unit 18
20 questions
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Lesson 18B.4, Proteins and the peptide bond: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 18: Organic Chemistry III, written with Revision Ninja.
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The 20 questions
-
What type of reaction links two amino acids together to form a dipeptide?
- Condensation
- Addition
- Substitution
- Hydrolysis
-
What products are obtained from the complete hydrolysis of a protein?
- Carboxylic acids
- Dipeptides
- Amino acids
- Amines
-
Which reagent is commonly used to hydrolyse a protein into amino acids?
- Hot aqueous acid
- Aqueous sodium chloride
- Concentrated sulphuric acid
- Cold dilute alkali
-
What term describes the sequence of amino acids in a protein?
- Primary structure
- Quaternary structure
- Tertiary structure
- Secondary structure
-
Which functional group is present in a peptide bond?
- An ester, -COO-
- A carboxylic acid, -COOH
- An ether, -O-
- An amide, -CONH-
-
How many amino acids are released when a dipeptide is completely hydrolysed?
- 1
- 2
- 3
- 4
-
What are the products of hydrolysing the dipeptide glycine-alanine?
- Alanine and valine
- Glycine and lysine
- Two glycine molecules
- Glycine and alanine
-
How many peptide bonds are in a tetrapeptide?
- 2
- 4
- 1
- 3
-
How many moles of water are consumed in complete hydrolysis of 1 mol of a tripeptide?
- 2 mol, which is 36 g
- 3 mol, which is 54 g
- 1 mol, which is 18 g
- 4 mol, which is 72 g
-
Why is glycine the only non-optically active natural amino acid?
- No chiral carbon
- No carboxyl group
- No amine group
- No hydrogen atoms
-
What dipolar ionic form do amino acids take at neutral pH?
- Anion
- Zwitterion
- Cation
- Carbocation
-
Why does the C-N bond in an amide group have partial double-bond character?
- Lone pair delocalisation
- Covalent bond overlap
- Hydrogen bonding
- Steric hindrance
-
What aspect of a protein determines how its polypeptide chain ultimately folds?
- Secondary structure
- Primary structure
- Tertiary structure
- Isoelectric point
-
What is the number of amino acid residues in a chain with 150 peptide bonds?
- 151
- 300
- 75
- 150
-
A pentapeptide is completely hydrolysed. How many water molecules are needed?
- 10
- 5
- 3
- 4
-
What term describes a short chain of amino acids linked by peptide bonds?
- Peptide
- Polypeptide
- Nucleotide
- Polyester
-
What type of bond requires prolonged reflux with acid to hydrolyse in proteins?
- Ionic bond
- Hydrogen bond
- Peptide bond
- Disulfide bond
-
Which bonds remain unbroken when a protein is denatured by heat?
- Hydrogen bonds
- Peptide bonds
- Ionic interactions
- Disulfide bridges
-
Which specific bond is cleaved when a peptide bond is hydrolysed?
- N-H bond
- C-N bond
- C=O bond
- C-C bond
-
What is the term for a single amino acid unit inside a polypeptide chain?
- Zwitterion
- Monomer
- Residue
- Peptide
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