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Enzymes quiz
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19
Biology
10th Grade
12/04/2008

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Term
reactant
Definition
the elements or compounds that enter into a chemical reaction
Term
product
Definition
elements or compounds that enter into a chemical reaction
Term
activation energy
Definition
factor in whether the overall chemical reaction releases energy or absorbs energy
Term
catalyst
Definition
is a substance that speeds up the rate of a chemical reaction
Term
enzyme
Definition
are proteins that act as biological catalysts
Term
substrate
Definition
the reactants of enzyme-catalyzed reactions
Term
cell
Definition
the basic unit of all living things
Term
cell theory
Definition

idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells

Term
Robert Hooke
Definition
1665, english scientist observed cork under a microscope and used the term cell to describe what he saw
Term
Anton van Leeuwenhoek
Definition
used a single-lens microscope to observe pond water and other things. To his amazement, the microscope revealed a fantastic world of tiny living organisms
Term
Matthias Schleiden
Definition
concluded that all plants were made of cells
Term
Theodor Schwann
Definition
stated that all animals were made of cells
Term
Rudolf Virchow
Definition
German physician concluded that new cells could be produced only from the division of existing cells
Term
nucleus
Definition

the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities

Term
prokaryote
Definition

unicellular organism lacking a nucleus

Term
eukaryote
Definition

organism whose cells contain nuclei

Term
membrane
Definition
the part of the cell that gives the cell shape and hold the cytoplasm
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