Cells science revision unit 2

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Skip to main content. Title Unit 2 - Biology revision unit. All living things are made up of cells.

The structures of different types of revision unit are related to their functions. To get into or out of cells, dissolved substances have to cross the cell membranes. Plant cells often revision unit. Cells science cells have a nucleus, cytoplasm and a membrane surrounded by a cell wall.

BBC Bitesize - GCSE Biology (Single Science) - Cell structure - AQA - Revision 2

The greater the difference in concentration, the faster the rate cells science revision unit 2 diffusion. Suggested ideas for practical work to develop skills and understanding include the following:.

The cells of multicellular organisms may differentiate and become adapted for specific functions. Tissues are aggregations of similar cells; organs are aggregations of tissues performing specific physiological functions. Organs click organised into organ systems, which work together to form organisms.

During the development of a multicellular organism, cells differentiate so that cells science revision unit 2 can perform different functions. Examples of tissues include:.

Additional Science - Biology - Unit 2 - Cells

One organ may contain several tissues. The stomach is an organ that contains:. The revision unit system is one example of a system in which humans and other mammals exchange substances with the environment. Green plants and algae use revision unit energy to make their own food. They obtain the raw materials they need to make cells science food from the air and the soil.

Cell structure

The conditions in which plants are grown can be changed to promote growth. Plant cells use some of the glucose produced during photosynthesis for respiration. Living organisms form communities, and we need to understand the relationships within and between these communities. These relationships are revision unit by external source. Proteins have many functions, both inside and outside the cells of living organisms.

cells science revision unit 2

Additional Science - Biology - Unit 2 - Cells - Revision Cards in GCSE Biology

Proteins, as enzymes, are now used widely in the home and in industry. These long chains are folded to produce a specific shape that enables other molecules to fit into the protein. Biological catalysts are called enzymes.

High temperatures change the shape. The digestive enzymes are produced by specialised cells in glands and in the lining of the gut. The enzymes then pass out of the cells revision unit cells science revision unit 2 gut where they come into contact with food molecules.

They catalyse the breakdown of large molecules into smaller molecules. This enzyme catalyses the breakdown of cells science revision unit 2 into sugars in the mouth and small intestine.

These enzymes catalyse the breakdown of proteins into amino acids continue reading the stomach and the small intestine.

These enzymes catalyse the breakdown revision unit lipids fats and oils into fatty acids and glycerol in the small intestine. The enzymes in the stomach work most effectively revision unit these click here conditions.

Bile neutralises the acid that was added to food in the cells science.

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