Review worksheet covering IB Biology content on Proteins and Enzymes (Topics 2.4, 2.5, and 7.3)

1. IB Biology: Proteins & Enzymes Review (2.4, 2.5, & 7.3) NAME:
1. Draw a generalized aminoacid:
2. Explainthe fourlevelsof proteinstructure:
3. ExplainhowchangesinpH and temperature leadtodenaturationof proteins:
4. Outline the significanceof these structuresinthe R-groups(side-chains) of aminoacids (thinkaboutwhattype of bonds
theymightformin eithersecondaryortertiarystructures).
 PolarR-groups:
 Non-polarR-groups:
 Positively or negatively charged R-groups:
 Sulphur-containing R-groups:
5. Compare fibrousandglobularproteins:
Fibrous Globular
What does it look like?
Solubility
Functions
Examples

2. 6. Proteinsare usedonthe plasmamembrane andfor otherdiverse functions.Complete the table below:
ProteinFunction Example What doesit do?
Gas / Nutrient
Transport
Catalyst/ Enzyme
Immunity/
Defense
Hormones
Structure / Tensile
Strength
Movement/
Muscle Contraction
DNA Packaging
7. Complete the table describingthe functionsof the six specificproteinexample,below:
ProteinExample Function
Rubisco
Insulin
Immunoglobulin
(Antibodies)
Collagen
Rhodopsin
Spidersilk
8. Define the following:
enzyme “globularprotein which actsas a catalystforbiological reactions”
active site
denaturation
9. List three examples of enzymes,withtheirfunctions.
 ________________________________________________________________________
 ________________________________________________________________________
 ________________________________________________________________________
10. Explainenzyme-substratespecificity.Include adiagram:
11. State the functionof polarregions of aminoacidson the active site of the enzyme.

3. 12. Explainthe loweringof activation energy byenzymes.
13. Explainthe effectsof temperature,pHandsubstrate concentrationonthe rate of an enzyme-controlledreaction. Draw
a sample graphin the space on the leftandthenexplain/describe onthe right:
Temperature
pH
Substrate concentration
14. Explainthe industrial productionof lactose-free milk,including
twoadvantagesof lactose-free milk: