Knowing More About Enzymes

Information is adapted from http://www.biologyguide.net/unit1/2_enzymes.htm Secondary 1/2 Level What are enzymes? All enzymes are globular proteins → spherical in shape (Fig 3) Control biochemical reactions in cells They have the suffix “-ase“ Intracellular enzymes are found inside the cell Extracellular enzymes act outside the cell (e.g. digestive enzymes) Enzymes are catalysts → speed up chemical reactions (Fig 1 & Fig 2) … Read more

Transport Systems in Organisms

Secondary 1/2 Level Preferred terms In Osmosis: we prefer the term “water potential” to “water concentration”. For xylem and phloem: we prefer the term vessel than tube. i.e xylem vessel. Active transport, osmosis and diffusion Diffusion Osmosis Active transport Down a concentration gradient ✓ ✓ ✗ Against a concentration gradient ✗ ✗ ✓ Energy needed … Read more

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