IB Biology SL B1.1.8 Hydrophobic Properties of Lipids Questions
Practise IB Biology SL B1.1.8 by linking lipid hydrophobicity and lipid examples to water insolubility and polarity.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Identify a lipid in a molecular representation from its predominantly non-polar or hydrophobic structure.
- Explain oil insolubility in water by linking non-polar hydrocarbon chains to weak hydrogen-bonding with polar water.
- Explain glucose solubility in water by linking its polar, hydrophilic groups to hydrogen bonding with water.
IB Biology SL B1.1.8 Hydrophobic Properties of Lipids Questions question 1
[Maximum number: 4]
Fats are used by mammals and oils are used by plants for energy storage. Both of these types of lipid are triglycerides.
Explain the reasons for oils being insoluble and sugars such as glucose being soluble in water.
a. sugar/glucose is hydrophilic;
b. oils are hydrophobic;
c. sugar molecules are polar whereas oil molecules/hydrocarbon chains are non- polar;
d. oil does not form hydrogen bonds with water whereas sugar/glucose does;
e. oil molecules are more attracted to each other than to water / vice versa;
f. water is polar and polar substances are attracted to each other;
Both parts of mpc and mpd are required for the mark
4
Marking guidance:
max
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