*Question*
Q: In preparation for phagocytosis, a portion of the inward-facing surface of the plasma membrane becomes coated with a protein called clathrin, which stabilizes this section of what? Read this paragraph and choose the correct option from the provided answers: In preparation for phagocytosis, a portion of the inward-facing surface of the plasma membrane becomes coated with a protein called clathrin, which stabilizes this section of the membrane. The coated portion of the membrane then extends from the body of the cell and surrounds the particle, eventually enclosing it. Once the vesicle containing the particle is enclosed within the cell, the clathrin disengages from the membrane and the vesicle merges with a lysosome for the breakdown of the material in the newly formed compartment (endosome). When accessible nutrients from the degradation of the vesicular contents have been extracted, the newly formed endosome merges with the plasma membrane and releases its contents into the extracellular fluid. The endosomal membrane again becomes part of the plasma membrane. Pinocytosis A variation of endocytosis is called pinocytosis. This literally means "cell drinking" and was named at a time when the assumption was that the cell was purposefully taking in extracellular fluid. In reality, this is a process that takes in molecules, including water, which the cell needs from the extracellular fluid. Pinocytosis results in a much smaller vesicle than does phagocytosis, and the vesicle does not need to merge with a lysosome (Figure 5.21). Choices: - particles - mitochondria - nuclei - membrane A:
**Answer**
membrane

*Question*
Q: The migration of what familiar coastal landform involves saltation and gravity? Read this paragraph and choose the correct option from the provided answers: Once a sand dune forms, it may slowly migrate over the land. The wind moves grains of sand up the gently sloping side of the dune. This is done by saltation. When the sand grains reach the top of the dune, they slip down the steeper side. The grains are pulled by gravity. The constant movement of sand up and over the dune causes the dune to move along the ground. It always moves in the same direction that the wind usually blows. Can you explain why?. Choices: - volcanos - lakes - rivers - sand dunes A:
**Answer**
sand dunes

*Question*
Q: The cells of all eukarya have a what? Read this paragraph and choose the correct option from the provided answers: Some Eukarya are also single-celled, but many are multicellular. Some have a cell wall; others do not. However, the cells of all Eukarya have a nucleus and other organelles. Choices: - chloroplast - epidermis - necrosis - nucleus A:
**Answer**
nucleus

*Question*
Q: The quarks in a particle are confined, meaning individual quarks cannot be what? Read this paragraph and choose the correct option from the provided answers: Identify evidence for electroweak unification. The quarks in a particle are confined, meaning individual quarks cannot be directly observed. Are gluons confined as well? Explain. Choices: - separated - changed - hypothesized - directly observed A:
**Answer**
directly observed