6. The word to describe an organic or metal ion molecule that binds tightly to the active site, enabling the enzyme-substrate complex to form.
Prosthetic group
Coenzyme
Ion
7. In anabolic reactions, the substrate is:
Formed from two extraneous things and then released for some purpose.
Broken down into products which are put into use elsewhere.
8. Unlike the effects of temperature on enzymes’ active sites, denaturing by increased or decreased pH is NOT irreversible.
True
False
9. There is an optimal temperature for enzymatic reactions because:
Too high a temperature would cause irreversible denaturing of active sites, and too low a temperature would reduce rate of successful enzyme/substrate collisions.
Too high a temperature would affect availability of active sites and too low a temperature would risk the irreversible denaturing of active sites.
10. Some enzymes require binding to a non-protein group ‘co-factor’ to help them work; these co-factors typically modify the shape of the active site. In this process, what is a holoenzyme?
Non-protein groups in general.
The altered active site
The enzyme/co-factor combination after binding
An inorganic co-factor, like a Cl anion.
11. Without enzymes to act as catalysts, reactions in the body would take MUCH longer to occur (at the same temperature). It is said that they lower the ......... energy of the reaction.
Extracellular
Activation
Intracellular
Decomposition
12. In the ‘induced fit’ model of enzyme action, the active site:
Adapts to the shape of the substrate to break it down into products.
Is adapted to the shape of a specific substrate and engages/breaks it down into products on contact.
13. The word to describe an organic molecule that binds loosely to the active site, enabling the enzyme-substrate complex to form.
Prosthetic group
Coenzyme
Ion
14. In catabolic reactions, the substrate is:
Broken down into products which are put into use elsewhere.
Formed from two extraneous things and then released for some purpose.
