Q1. The calculation of exogenous leptin, at concentrations found in obese patients, induces significant morphological changes in DC. The number, length, and diameter of dendrites/llamelopodia are dramatically increases upon treatment of leptin (control experiments verify that the changes are specifically leptin-induced).

Diagram two experimental approaches that would determine which signalling pathway is specifically responsible for this morphological change.

Q2. Evaluate the sizes of the different digestive organs of the earthworm. Which organ is largest in the earthworm? How does its size make it well suited for its function?