Lesson 2.3.1
2.3.1 Amino acids, polypeptides and protein structure Quiz: Pearson Edexcel Biology, Unit 2
20 questions
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Lesson 2.3.1, Amino acids, polypeptides and protein structure: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 2: Genes and Health, written with Revision Ninja.
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The 20 questions
-
Which central atom are the functional groups in an amino acid bonded to?
- Nitrogen
- Oxygen
- Phosphorus
- Carbon
-
How many different standard amino acids are used to build proteins in living organisms?
- 4
- 64
- 61
- 20
-
What type of bond joins two amino acids in a polypeptide chain?
- Ester bond
- Glycosidic bond
- Peptide bond
- Phosphodiester bond
-
Which type of reaction forms a peptide bond between two amino acids?
- Condensation
- Oxidation
- Reduction
- Hydrolysis
-
A polypeptide is made from 12 amino acids. How many peptide bonds does it contain?
- 10
- 24
- 12
- 11
-
Which level of protein structure is determined by the sequence of amino acids in the chain?
- Secondary structure
- Tertiary structure
- Quaternary structure
- Primary structure
-
Which type of bond stabilises the secondary structure of a protein?
- Ionic bond
- Peptide bond
- Disulfide bridge
- Hydrogen bond
-
Which bond type is a covalent link that can stabilise tertiary structure through two cysteine residues?
- Glycosidic bond
- Disulfide bridge
- Hydrogen bond
- Ionic bond
-
Which type of interaction usually occurs between non-polar R groups inside globular proteins?
- Hydrophobic interaction
- Ionic bond
- Disulfide bridge
- Hydrogen bond
-
What level of protein structure describes the arrangement of multiple polypeptide chains?
- Quaternary structure
- Primary structure
- Tertiary structure
- Secondary structure
-
Which level of protein structure determines the overall three-dimensional folding pattern?
- Primary structure
- Secondary structure
- Prosthetic group
- Quaternary structure
-
Where are hydrophilic R groups located on a soluble globular protein?
- In the centre
- On the outside
- Along the core
- Between subunits
-
Which term best describes proteins that form long, insoluble structural strands?
- Fibrous proteins
- Conjugated proteins
- Globular proteins
- Spherical proteins
-
Which of these is a globular protein?
- Elastin
- Haemoglobin
- Collagen
- Keratin
-
What is the approximate number of amino acids in a polypeptide that has a mass of 11 000 daltons, if the average amino acid has a mass of 110 daltons?
- 1000
- 10
- 100
- 1100
-
Which feature of an enzyme's tertiary structure allows it to bind a specific substrate?
- Peptide backbone
- Triple helix
- Prosthetic group
- Active site
-
Which part of an amino acid structure varies between different amino acids?
- Amine group
- Central hydrogen
- Carboxyl group
- R group
-
A protein has two identical polypeptide chains held together by hydrogen bonds and ionic bonds. Which level of structure does this describe?
- Primary structure
- Quaternary structure
- Tertiary structure
- Secondary structure
-
Which structural motif in proteins is formed by hydrogen bonding into a spiral shape?
- Triple helix
- Alpha helix
- Disulfide bridge
- Beta pleated sheet
-
How does collagen differ in shape from a haemoglobin molecule?
- Collagen is spherical
- Collagen is fibrous
- Collagen is circular
- Collagen is globular
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