Lesson 3.1.4.1.2
3.1.4.1.2 Protein structure: primary to quaternary Quiz: AQA Biology, Unit 1
20 questions
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Lesson 3.1.4.1.2, Protein structure: primary to quaternary: 20 multiple choice questions for the AQA Biology (7402), Unit 1: Biological molecules, written with Revision Ninja.
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The 20 questions
-
What defines the primary structure of a protein molecule?
- Globular 3D shape
- Alpha helix folding
- Subunit arrangement
- Amino acid sequence
-
Which bonds maintain the secondary structure of a protein?
- Ionic bonds
- Peptide bonds
- Disulfide bridges
- Hydrogen bonds
-
What level of protein structure involves multiple polypeptide chains joined together?
- Quaternary structure
- Primary structure
- Tertiary structure
- Secondary structure
-
How many polypeptide chains does normal adult haemoglobin contain?
- 1
- 4
- 8
- 2
-
Which covalent bond stabilises the tertiary structure of a protein?
- Peptide bond
- Hydrogen bond
- Ionic bond
- Disulfide bridge
-
Which bond type helps maintain the tertiary structure of a protein?
- Phosphodiester bond
- Ester bond
- Ionic bond
- Glycosidic bond
-
A beta-pleated sheet is an example of which level of protein structure?
- Tertiary structure
- Primary structure
- Secondary structure
- Quaternary structure
-
Which protein structure level determines how a polypeptide chain folds into its final shape?
- Quaternary structure
- Secondary structure
- Primary structure
- Prosthetic group
-
In sickle cell anaemia, substitution of a surface amino acid causes haemoglobin molecules to do what?
- Denature completely
- Dissolve completely
- Hydrolyse rapidly
- Form long fibres
-
Breaking disulfide bridges in a protein directly affects which structural level?
- Secondary structure
- Tertiary structure
- Peptide sequence
- Primary structure
-
Which level of protein structure remains intact when a protein is denatured by heat?
- Primary structure
- Tertiary structure
- Quaternary structure
- Secondary structure
-
Which structural level determines the specific three-dimensional shape of an enzyme active site?
- Primary structure
- Quaternary structure
- Tertiary structure
- Secondary structure
-
A protein has three identical polypeptide chains, each with 100 amino acids. How many peptide bonds are present in total?
- 300
- 297
- 303
- 294
-
Which property is characteristic of a fibrous protein such as collagen?
- Spherical shape
- High tensile strength
- Metabolic activity
- High solubility
-
Which level of protein structure is altered when a protein loses its specific 3D shape?
- Secondary sequence
- Peptide structure
- Primary structure
- Tertiary structure
-
Which factor directly dictates how a polypeptide chain folds into its tertiary structure?
- Substrate concentration
- Cellular pH
- Amino acid sequence
- Peptide bond length
-
Changes in pH disrupt protein shape primarily by breaking which type of bond?
- Disulfide bridges
- Ionic bonds
- Ester bonds
- Peptide bonds
-
What term describes how binding oxygen to one haemoglobin subunit increases affinity in others?
- End-product inhibition
- Cooperative binding
- Competitive inhibition
- Allosteric degradation
-
Which quaternary structure gives collagen its high tensile strength?
- Alpha helix
- Triple helix
- Beta-pleated sheet
- Single coiled strand
-
Which feature defines the quaternary structure of a protein?
- Single polypeptide chain
- Local alpha-helices
- Amino acid sequence
- Multiple polypeptide chains
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