Enzymes

Level: Grade 12
1. An enzyme . . .
requires a specific biochemical reaction to function as a catalyst
is produced by living cells
functions as an organic catalyst
cannot induce a chemical reaction
will act only on a specific substrate and not on any other
is a protein
has no one particular shape
is useful to life but not very necessary
is a chemical, not a protein
2. The role of enzymes in metabolism is to . . .
slow down the chemical reaction
speed up chemical reactions in cells
neutralise the chemical reaction
control and regulate the chemical reaction
3. Enzymes are responsible for certain reactions that allow molecules to be built into proteins, DNA, RNA and polysaccharides.
TrueFalse

4. Do enzymes continue to catalyse chemical reactions in a repeating manner?
yes
no
5. Do enzymes exhibit . . .
enormous catalytic power
zero catalytic power
hardly any catalytic power
moderate catalytic power
6. The enzyme lipase, that breaks down fats, is produced in . . .
the liver
the digestive parts of animals but not in plants
plants
the pancreas
the stomach
the liver but nowhere else
animals but not plants
7. Enzymes . . .
never remain in the cells where they were formed
ocassionally can do their work elsewhere
remain in the cells where they were formed
occasionally remain in the cells where they were formed
8. Co-enzymes . . .
are organic substances
are loosely bound to the enzyme
will include most vitamins
transfer atoms or groups of atoms
are tightly bound to the enzyme
will not include vitamins
9. The enzyme sucrase catalyzes the hydrolysis of sucrose to . . .
are organic substances
are loosely bound to the enzyme
will include most vitamins
transfer atoms or groups of atoms
are tightly bound to the enzyme
will not include vitamins
10. Enzymes dictate the pattern of chemical changes in a cell.
TrueFalse

11. Enzymes reduce the amount of energy needed to begin a reaction.
TrueFalse

12.

Many enzymes form chemical bonds with ...

13.

Can an enzyme be seen with a powerful light microscope? 

 

 


 frequently
no
always
14.

Enzymes from mammals usually operate optimally at - - - - temperature.


 ambient temperature
room temperature
body temperature
15. Enzymes speed up chemical reactions in
all animals and only in certain plants
animals alone
both plants and animals
plants alone

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