Biologie Klasse 10–12

Grade 9 Enzymes

Geteilt von Amro Abdoun vor 2 Stunden 5 F 0 Mal übernommen

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What is the primary function of enzymes in living organisms?

A To store genetic information for protein synthesis

B To provide structural support to cell membranes

C To serve as a source of energy for cellular processes

D To act as biological catalysts that speed up chemical reactions

Which of the following best describes the effect of temperature on enzyme activity?

A Enzyme activity decreases steadily as temperature increases.

B Enzyme activity increases indefinitely as temperature rises.

C Enzyme activity is unaffected by temperature changes.

D Enzyme activity increases with temperature up to an optimum, then decreases due to denaturation.

A student tests the effect of pH on an enzyme found in the human stomach. At which pH would the enzyme most likely show maximum activity?

A pH 2

B pH 12

C pH 9

D pH 7

If the concentration of substrate is increased while enzyme concentration remains constant, what happens to the rate of reaction?

A The rate decreases because excess substrate inhibits the enzyme.

B The rate increases continuously without limit.

C The rate remains constant regardless of substrate concentration.

D The rate increases until all enzyme active sites are occupied, then levels off.

Which statement correctly explains why an enzyme is said to be 'specific'?

A Each enzyme has a unique active site that fits only specific substrates.

B Each enzyme can catalyze any reaction in the cell.

C Enzymes are specific only to temperature and pH conditions.

D Enzymes are specific because they are made of proteins.

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