How enzymes work
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-LS1-6 · England: GCSE Combined Science: Organisation (enzymes)
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Question 1
A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 65 °C?
- A. working slowly, but not denatured
- B. working at or near its fastest rate
- C. denatured and no longer working
Question 2
Why can an enzyme only act on one type of substrate?
- A. Other substrates are dead
- B. Enzymes are used up after one reaction
- C. Enzymes are too big
- D. Only that substrate fits the shape of its active site
Question 3
Enzymes: which statement is NOT true?
- A. Most human enzymes work best at about 37 °C.
- B. Enzymes are not used up in the reactions they speed up.
- C. All enzymes work best at pH 7.
- D. Enzymes are proteins.
Question 4
A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 65 °C?
- A. working slowly, but not denatured
- B. working at or near its fastest rate
- C. denatured and no longer working
Question 5
What happens to an enzyme above its optimum temperature?
- A. It works faster and faster forever
- B. It is killed like a cell
- C. Its active site changes shape and it is denatured
- D. It turns into a different enzyme
Question 6
Enzymes: which statement is NOT true?
- A. Enzymes are not used up in the reactions they speed up.
- B. Enzymes are proteins.
- C. Enzymes are biological catalysts.
- D. Enzymes are living things.
Question 7
A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 36 °C?
- A. working slowly, but not denatured
- B. working at or near its fastest rate
- C. denatured and no longer working
Question 8
Why can an enzyme only act on one type of substrate?
- A. Enzymes are used up after one reaction
- B. Only that substrate fits the shape of its active site
- C. Enzymes are too big
- D. Other substrates are dead
Question 9
Enzymes: which statement is NOT true?
- A. Most human enzymes work best at about 37 °C.
- B. Enzymes are proteins.
- C. All enzymes work best at pH 7.
- D. Enzymes are not used up in the reactions they speed up.
Question 10
A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 38 °C?
- A. working slowly, but not denatured
- B. working at or near its fastest rate
- C. denatured and no longer working
Question 11
Why can an enzyme only act on one type of substrate?
- A. Only that substrate fits the shape of its active site
- B. Enzymes are used up after one reaction
- C. Enzymes are too big
- D. Other substrates are dead
Question 12
Enzymes: which statement is NOT true?
- A. Enzymes are proteins.
- B. Most human enzymes work best at about 37 °C.
- C. Enzymes are not used up in the reactions they speed up.
- D. Enzymes are living things.
Question 13
A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 15 °C?
- A. working slowly, but not denatured
- B. working at or near its fastest rate
- C. denatured and no longer working
Question 14
Why does a reaction speed up as temperature rises towards the optimum?
- A. Molecules move faster, so enzyme and substrate collide more often
- B. The substrate becomes an enzyme
- C. The active site disappears
- D. The enzyme gets bigger
Question 15
Enzymes: which statement is NOT true?
- A. Enzymes are biological catalysts.
- B. Enzymes are living things.
- C. Enzymes are proteins.
- D. Most human enzymes work best at about 37 °C.
Question 16
A human enzyme has an optimum temperature of about 37 °C. What is the enzyme most likely to be doing at 38 °C?
- A. working slowly, but not denatured
- B. working at or near its fastest rate
- C. denatured and no longer working
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