Question

highlight the statements that describe pinocytosis and receptor - mediated endocytosis. (select at least 4 sentences to check answer) 1. receptor - mediated endocytosis uses the protein caveolin to coat the plasma membrane. 2. pinocytosis is known as cell drinking. 3. pinocytosis brings in small ions needed by the cell along with a droplet of fluid. 4. the lack of receptors can prevent the uptake of materials needed by the cell and result in disease. 5. pinocytosis uses the protein clathrin to coat the vesicle needed to bring materials into the cell. 6. receptor - mediated endocytosis targets specific molecules. 7. a variation of pinocytosis is phagocytosis.

Explanation:

1. Receptor - mediated endocytosis often uses clathrin, not caveolin to coat the plasma membrane in most cases, so statement 1 is incorrect.
2. Pinocytosis is indeed known as "cell - drinking", so statement 2 is correct.
3. Pinocytosis does bring in small ions along with a droplet of fluid, so statement 3 is correct.
4. Lack of receptors can prevent proper uptake of needed materials and lead to disease, which is relevant to receptor - mediated endocytosis, so statement 4 is correct.
5. Pinocytosis uses clathrin to coat vesicles for material uptake, this is incorrect as clathrin is more associated with receptor - mediated endocytosis.
6. Receptor - mediated endocytosis targets specific molecules, so statement 6 is correct.
7. Phagocytosis is a different process from pinocytosis, not a variation of it, so statement 7 is incorrect.

Answer:

1. Pinocytosis is known as "cell drinking".
2. Pinocytosis brings in small ions needed by the cell along with a droplet of fluid.
3. The lack of receptors can prevent the uptake of materials needed by the cell and result in disease.
4. Receptor - mediated endocytosis targets specific molecules.