Match each transport mechanism with a suitable analogy.

1. a dog being dragged into a bathtub against its will
phagocytosis
2. a child eating a doughnut
pinocytosis
3. a dog pulled on a wagon through a spring loaded door
passive diffusion
4. a woman drinking tea
active transport
5. a crowded roomful of people gradually standing up, wandering around, and leaving the room
facilitated diffusion

Compare and contrast the adaptations of free-living flatworms and parasitic flatworms

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z