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S2 Cells - Glossary FC
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27
Biology
Not Applicable
11/13/2015

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Term
catalyst
Definition
A substance which speeds up the rate of a chemical reaction without being changed or used up.
Term
enzyme
Definition
protein made by living cells that acts as a biological catalyst.
Term
protein
Definition
type of molecule that enzymes are made of
Term
catalase
Definition
enzyme which catalyses break down of hydrogen peroxide into oxygen and water
Term
phosphorylase
Definition
enzyme which catalyses builds up of glucose-1-phosphate into starch.
Term
amylase
Definition
enzyme which catalyses the breakdown of starch into sugar (maltose)
Term
specific
Definition
term to describe the ability of an enzyme to act on only ONE type of substrate
Term
lock and key theory
Definition
idea (theory) that an enzyme and substrate molecules fit together because of their complementary shape
Term
substrate
Definition
substance which an enzyme acts on
Term
synthesis reaction
Definition
building up large molecules from smaller ones
Term
breakdown reaction (digestion)
Definition
turning large molecules into smaller ones
Term
optimum
Definition
condition at which an enzyme is most active
Term
denatured
Definition
state of an enzyme that has been permanently destroyed by being heated to a temperature of over 50oC
Term
aerobic respiration
Definition
chemical process that releases energy from food using oxygen
Term
fermentation
Definition
chemical process that releases energy from food without using oxygen
Term
glucose
Definition
fuel food containing energy
Term
yeast
Definition
single celled fungus
Term
oxygen
Definition
gas needed for efficient release of energy from food during aerobic respiration
Term
ethanol
Definition
waste product of anaerobic respiration in yeast
Term
carbon dioxide
Definition
waste product of respiration (GAS)
Term
diffusion
Definition
movement of a substance from an area where it is high in concentration to an area where it is low in concentration
Term
cell membrane
Definition
cell structure that allows only small molecules to cross into or out of the cell
Term
glucose, oxygen, carbon dioxide & water
Definition
molecules small enough to diffuse across the cell membrane
Term
starch
Definition
molecule too large to pass across the cell membrane
Term
chromosomes
Definition
thread-like structure carrying the genetic code, found in the nucleus
Term
cell division
Definition
how cells make more copies of themselves for growth and repair
Term
cancer
Definition
disease caused by uncontrolled growth of cells
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