Enzymes

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Enzyme action

Subtopic

Enzyme action under Enzymes for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

1.
$What is the term for the specific region of an enzyme where the substrate binds?$
A. $Reaction zone$
B. $Binding pocket$
C. $Active site$
D. $Catalytic center$
2.
$0^\circ C$
A. $The rate decreases as enzymes lose kinetic energy$
B. $The rate increases as molecules move faster and collide more often$
C. $The rate stays the same because enzymes are not alive$
D. $The rate stops completely because the enzyme is denatured$
3.
$In the 'Lock and Key' model of enzyme action, what does the 'Lock' represent?$
A. $The product$
B. $The enzyme$
C. $The substrate$
D. $The active site$

Download the worksheet for Enzymes - Enzyme action to practice offline. It includes additional chapter-level practice questions.

Effects of temperature and pH

Subtopic

Effects of temperature and pH under Enzymes for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

1.
$Which specific part of the enzyme is altered when changes in pH or temperature prevent it from functioning?$
A. $The cell wall$
B. $The active site$
C. $The nucleus$
D. $The ribosome$
2.
$What is the approximate optimum temperature for most enzymes found in the human body?$
A. $37^\circ C$
B. $20^\circ C$
C. $60^\circ C$
D. $10^\circ C$
3.
$80^\circ C$
A. $Inactivation$
B. $Denaturation$
C. $Condensation$
D. $Decomposition$

Download the worksheet for Enzymes - Effects of temperature and pH to practice offline. It includes additional chapter-level practice questions.

Enzymes - IGCSE Grade 11 Biology Notes & Revision | Krit.club