Fig. 3.1 shows the junction between two neurones in a healthy person, whereas Fig. 3.2 shows the junction between the same two neurones in a person with Parkinson’s disease. This disease affects the nervous system.
(a)[2]
Identify the structures labelled X and Y in Fig. 3.2.
(b)[5]
Using the information in Fig. 3.1 and Fig. 3.2, suggest and explain how Parkinson’s disease affects a person’s movement.
(c)[2]
Describe two ways nervous control differs from hormonal control.
(d(i))[2]
Explain how the shape of receptor proteins is determined.
(d(ii))[2]
Cell membranes also include protein carriers. Describe the role played by protein carriers.
Worked solution & mark scheme
This 13-mark question has a full step-by-step worked solution and mark scheme. One marking point: “X is the vesicle (membrane).” …