Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
Follicle stimulating hormone (FSH) and luteinising hormone (LH) each have two polypeptide chains, the $\alpha$ and $\beta$ chains.
• The $\alpha$ chains in FSH and LH are identical.
• FSH has a $\beta$ chain of 111 amino acids, whereas LH has a $\beta$ chain of 121 amino acids.
• FSH and LH attach to different receptors in the cell surface membranes of their target cells.
• This attachment causes steroid synthesis in the target cells.
(a)[3]
Explain why FSH is unable to bind to an LH receptor.
(b(i))[1]
Identify the cells of a human female that have FSH receptors.
(b(ii))[1]
Name the cells of a human female that have LH receptors.
(c)[3]
Describe what occurs when FSH binds to receptors on its target cells.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The receptor or binding site is not complementary / specific to FSH” …