International Baccalaureate IB IB Biology is challenging, college-level biology, so sometimes you will need a little more study help than your class notes provide.
Here is a brief summary of previous topics.
A tissue is a group of similar cells which work together to carry out a particular function. Tissues are grouped into organs, and organs are grouped into organ systems. Movement in and out of cells Particles in gases, liquids and solutions are in constant random motion.
As a result of this, there is a net movement from where they are in a high concentration to where they are in a low concentration.
Diffusion is important to cells. For example, oxygen enters a respiring cell by diffusion, and carbon dioxide diffuses out of it.
Water molecules are small and can diffuse through a partially permeable membrane. Larger molecules dissolved in the water cannot do this. The diffusion of water through a partially permeable membrane is called osmosis.
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Osmosis is important to cells. In a dilute solution, water passes into a cell through its partially permeable cell membrane. The cell gets bigger.
Animal cells may burst, but plant cells do not because of their strong cell wall. In a concentrated solution, water passes out of a cell by osmosis through its partially permeable membrane.
Plant cells may become plasmolysed — that is, the cell membrane pulls away from the cell wall.
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A solution containing a lot of water is said to have a high water potential. A solution containing only a little water has a low water potential. Water moves by osmosis down a water potential gradient, from a high water potential to a low water potential.
Cells can use energy to move substances up their concentration gradient, from a low concentration to a high concentration. This is called active transport. It uses energy that the cells release by respiration. Video Cell Structure and Function at.Test #1 Notes: Characteristics of Life and Scientific Process & Tools.
Biology – _____ Characteristics of Life.
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