Final answer:
Experiments showing impaired GTP-hydrolysis in Dynamin proteins would lead to decreased endocytosis due to the inability of dynamin to facilitate vesicle scission, which is a crucial step in the endocytic process.
Step-by-step explanation:
If experiments with a patient's Dynamin proteins reveal impaired GTP-hydrolysis, the expected consequence is (B) Decreased endocytosis. Dynamin is a GTPase that is instrumental in the final pinch-off of a coated vesicle during the process of endocytosis. When GTPase activity is inhibited, as in the case you've provided or in certain cancers where the RAS G-protein's GTPase activity is compromised, the ability of the cell to properly perform endocytosis is hindered. Without the hydrolysis of GTP to GDP, the conformational change required for dynamin to facilitate the vesicle scission is disrupted, leading to a reduction in the amount of endocytosis. This can lead to a wide array of downstream effects, including impaired receptor recycling, reduced nutrient uptake, and disrupted cell signaling.