Ws Ch04 E
4
Enzymes and metabolism
4.1 Metabolism (Book 1A, p. 4-3)
Metabolism (新陳代謝) refers to the (1) _______________ of the chemical reactions that take place in an organism to keep it alive.
Catabolism (分解代謝)
Anabolism (合成代謝)
All the (2) _______________ reactions within an organism
(3) _______________ energy
All the (4) _______________ reactions within an organism
(5) _______________ energy
4.2 Properties and actions of enzymes (Book 1A, p. 4-4)
A
What is the role of enzymes in metabolism? (Book 1A, p. 4-4)
To start a chemical reaction, enough energy must be supplied to the reacting molecules so that they can overcome the (1) _______________ _______________ (能障).
Enzymes (酶) are (2) _______________ which act as biological (3) _____________ (生物催化劑).
Enzymes can speed up the rate of chemical reactions by (4) _______________ the energy barrier so that reactions can take place at body temperature.
Metabolic reactions would proceed very (5) _______________ or even stop without enzymes.
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Practical 4.1 Demonstration of the breaking-down action of enzymes (Book 1A, p. 4-5; Practical Workbook for SBA 1A, p. 4-1)
B
How do enzymes work? (Book 1A, p. 4-6)
Each enzyme molecule has an (6) _______________ _______________, which is
(7) _______________ (專一的) in shape.
The active site of an enzyme molecule combines with the substrate molecules that fits the active site to form an (8) ______________________ _______________. The formation of the complex lowers the energy barrier of the reaction.
In catabolic reactions, the enzyme helps to (9) _______________ the substrates apart.
Enzyme action in catabolic reactions
In anabolic reactions, the enzyme helps to (10) _______________ the substrates together.
Enzyme action in anabolic reactions
The complex then breaks down to give the (11) _______________. The enzyme is released in its (12) _______________ form.
Specificity of enzyme:
The (13) _______________ hypothesis (鎖鑰假說) explains the
Enzymes and metabolism
4.1 Metabolism (Book 1A, p. 4-3)
Metabolism (新陳代謝) refers to the (1) _______________ of the chemical reactions that take place in an organism to keep it alive.
Catabolism (分解代謝)
Anabolism (合成代謝)
All the (2) _______________ reactions within an organism
(3) _______________ energy
All the (4) _______________ reactions within an organism
(5) _______________ energy
4.2 Properties and actions of enzymes (Book 1A, p. 4-4)
A
What is the role of enzymes in metabolism? (Book 1A, p. 4-4)
To start a chemical reaction, enough energy must be supplied to the reacting molecules so that they can overcome the (1) _______________ _______________ (能障).
Enzymes (酶) are (2) _______________ which act as biological (3) _____________ (生物催化劑).
Enzymes can speed up the rate of chemical reactions by (4) _______________ the energy barrier so that reactions can take place at body temperature.
Metabolic reactions would proceed very (5) _______________ or even stop without enzymes.
Go to …
Practical 4.1 Demonstration of the breaking-down action of enzymes (Book 1A, p. 4-5; Practical Workbook for SBA 1A, p. 4-1)
B
How do enzymes work? (Book 1A, p. 4-6)
Each enzyme molecule has an (6) _______________ _______________, which is
(7) _______________ (專一的) in shape.
The active site of an enzyme molecule combines with the substrate molecules that fits the active site to form an (8) ______________________ _______________. The formation of the complex lowers the energy barrier of the reaction.
In catabolic reactions, the enzyme helps to (9) _______________ the substrates apart.
Enzyme action in catabolic reactions
In anabolic reactions, the enzyme helps to (10) _______________ the substrates together.
Enzyme action in anabolic reactions
The complex then breaks down to give the (11) _______________. The enzyme is released in its (12) _______________ form.
Specificity of enzyme:
The (13) _______________ hypothesis (鎖鑰假說) explains the