6 Questions
What is the difference between simple diffusion and facilitated diffusion?
Simple diffusion is the movement of molecules from an area of high concentration to an area of low concentration, without the need for a specific protein channel. Facilitated diffusion, on the other hand, requires the assistance of specific protein channels to move molecules across the cell membrane.
What is the role of ATP in active transport?
ATP (adenosine triphosphate) is the energy currency of cells. In active transport, ATP is used to fuel the movement of molecules against their concentration gradient, from an area of low concentration to an area of high concentration. ATP provides the energy needed to change the conformation of protein pumps and transport the molecules across the cell membrane.
Explain the differences between hypotonic, hypertonic, and isotonic solutions.
A hypotonic solution has a lower solute concentration compared to the cytoplasm of a cell. In this solution, water moves into the cell, causing it to swell or potentially burst. A hypertonic solution has a higher solute concentration compared to the cytoplasm of a cell. In this solution, water moves out of the cell, causing it to shrink or shrivel. An isotonic solution has an equal solute concentration compared to the cytoplasm of a cell. In this solution, there is no net movement of water, resulting in a stable cell volume.
__________ is the movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy input.
Simple diffusion
In __________, molecules move across a membrane with the help of transport proteins, but still follow the concentration gradient.
Facilitated diffusion
__________ is the movement of water across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.
Osmosis
Test your knowledge of cell transport and cell division processes with this quiz. From simple diffusion to active transport and from mitosis to meiosis, this quiz covers all the essential keywords and concepts.
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