Q5. Assertion: a heat-sensitive protein enzyme loses activity after sufficient heating beyond its stable range. Reason: heating can denature its functional protein structure. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion (NCERT page 116).
Q6. Why can the velocity of an enzyme reaction not rise above Vmax, however much substrate is added?
The enzyme molecules are fewer than the substrate molecules; once they are all saturated, no free enzyme is left to bind more substrate (NCERT page 116).
Q7. What is an apoenzyme?
The protein part of an enzyme that needs a non-protein co-factor to be active (NCERT page 118).
Q8. Which enzyme class catalyses the removal of groups from substrates, by mechanisms other than hydrolysis, leaving double bonds?
Lyases (NCERT page 117).
Q9. What is lowered by an enzyme: the energy of the product, or the activation energy?
The activation energy, the energy barrier between the substrate and the transition state (NCERT page 115).