IB Biology HL C2.1.1 Hl Receptors As Proteins Questions
Practise IB Biology HL 2.1.1 by applying receptors as proteins concepts to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Identify receptor proteins as specific binding sites for signalling ligands.
- Explain how complementary ligand-receptor shape and chemistry determine signalling specificity.
- Relate ligand binding to receptor activation, signal transduction and responses in target cells.
Learn this topic
IB Biology HL C2.1.1 Hl Receptors As Proteins Questions question 1
[Maximum number: 4]
The complementarity of shapes and chemical properties allows molecules to bind to each other.
Describe, with examples, the types of molecule within cell-to-cell signalling systems that are complementary to each other.
a. signalling chemicals/ligands bind to receptors;
b. reference to specificity / the shape (and chemical properties) of the ligand-binding site match those of the ligand;
c. receptors can be in (either) the plasma membrane / intracellular / in the cytoplasm / or nucleus
OR
ligand can bind to transmembrane receptors/receptors in the plasma membrane or intracellular receptors;
d. only cells with a receptor to a signalling chemical will respond;
e. reference to signal transduction (initiated by signalling chemical-receptor binding);
f. example of signalling chemical;
Marking guidance:
Do not accept the role of glycoproteins in cell-cell recognition or ABO glycoproteins.
For b: do not accept "complementary" as this is part of the stem question.
For e. OWTTE
For e. the reference may include the pathway followed by a given example of a signalling chemical.
Appropriate example for (f):
- Neurotransmitters/named neurotransmitter
- any named hormone
- Cytokine
- Calcium ions
4
max
All question bank results loaded