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Osmosis and tonicity. Hypertonic, isotonic, and hypotonic solutions and their effect on cells.
Explanation of hypotonic, isotonic, and hypertonic solutions and their effects on cells.
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Khan Academy
In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion. Here, we’ll look in more detail at membrane permeability and different modes of passive transport.
Learn AP Biology using videos, articles, and AP-aligned multiple choice question practice. Review the fundamentals of biochemistry, cell biology, genetics, evolution, and ecology, and develop scientific thinking skills as you explore the study of life.
Course: AP®︎/College Biology > Unit 2. Lesson 5: Membrane transport. Introduction to passive and active transport. Passive transport and selective permeability. Passive transport review. Active transport review. Endocytosis, phagocytosis, and pinocytosis.
Course: AP®︎/College Biology > Unit 2. Lesson 4: Membrane permeability. Cell membrane introduction. Cell membrane overview and fluid mosaic model. Fluid mosaic model: cell membranes article. Plant cell walls. The extracellular matrix and cell wall.
High school biology. NEW. High school chemistry. NEW. High school physics. NEW. Hands-on science activities. NEW. AP®︎/College Biology; AP®︎/College Chemistry; AP®︎/College Environmental Science; AP®︎/College Physics 1; See all Science; Computing; Intro to CS - Python. NEW. Computer programming;
In this unit, learn about these activities and how they come together to help cells carry out cellular respiration and photosynthesis, two of the most important biological processes on Earth.