Lesson 3.1.4.1.1
3.1.4.1.1 Amino acids and peptide bonds Quiz: AQA Biology, Unit 1
20 questions
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Lesson 3.1.4.1.1, Amino acids and peptide bonds: 20 multiple choice questions for the AQA Biology (7402), Unit 1: Biological molecules, written with Revision Ninja.
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The 20 questions
-
Which two functional groups are present in all amino acids?
- Carboxyl and carbonyl
- Methyl and phosphate
- Amine and hydroxyl
- Amine and carboxyl
-
Which component differs between the twenty different amino acids?
- The central carbon
- The R group
- The carboxyl group
- The amine group
-
How many amino acids are commonly found in all living organisms?
- 64
- 10
- 4
- 20
-
What type of bond joins two amino acids together?
- Hydrogen bond
- Peptide bond
- Glycosidic bond
- Phosphodiester bond
-
Which two groups react together to form a peptide bond?
- Carboxyl and carboxyl
- Amine and amine
- Hydroxyl and carboxyl
- Amine and carboxyl
-
What is formed when two amino acids join by a condensation reaction?
- A monopeptide
- A polypeptide
- A protein
- A dipeptide
-
What term describes a chain of many amino acids joined by peptide bonds?
- Ester chain
- Polypeptide
- Dipeptide
- Polysaccharide
-
A chain of 4 amino acids is formed by condensation. How many water molecules are released?
- 1
- 4
- 2
- 3
-
How many peptide bonds are present in a linear polypeptide of 300 amino acids?
- 300
- 299
- 298
- 301
-
What is the relative molecular mass of a dipeptide formed from two glycine molecules (75 each)?
- 93
- 114
- 132
- 150
-
Which molecule is released when two amino acids form a dipeptide?
- Oxygen
- Carbon dioxide
- Water
- Ammonia
-
How many peptide bonds are present in a linear chain of 12 amino acids?
- 11
- 12
- 24
- 10
-
What determines the unique folding and properties of different proteins?
- Phosphate group count
- Amino acid sequence
- Carbon backbone length
- Peptide bond type
-
What is the variable side chain in an amino acid called?
- Peptide group
- Amine group
- R group
- Carboxyl group
-
Which group must react with an amine group to form a peptide bond?
- Carboxyl group
- Methyl group
- Hydroxyl group
- Phosphate group
-
A polypeptide of 5 amino acids with average relative mass 110 each is formed by condensation. What is its approximate relative molecular mass?
- 478
- 532
- 550
- 514
-
How many different tripeptides can be formed from 20 amino acids if any amino acid can be used more than once in each position?
- 400
- 6840
- 60
- 8000
-
What term describes a molecule that can act as both an acid and a base?
- Dipolar
- Hydrophilic
- Amphoteric
- Hydrophobic
-
What property of the peptide bond restricts rotation and keeps it rigid?
- Partial double-bond character
- Ionic interaction
- Hydrophobic forces
- Hydrogen bonding
-
What molecule is required to break each peptide bond during protein hydrolysis?
- One water molecule
- One ATP molecule
- One hydrogen ion
- One carbon dioxide
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