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Quiz 3

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MDCAT Practice Test - Practice Test - Biology - Biological Molecules - 2026 Quiz

Attempt 10 MCQs on MDCAT Practice Test - Practice Test - Biology - Biological Molecules (Year 2026) | Quiz 3

21. What property of water results from unequal electron sharing between O and H?

Polarity
High specific heat
Cohesion
Adhesion

22. Which property of water helps stabilize body temperature?

High specific heat
Low specific heat
High heat of vaporization
Low heat of vaporization

23. Why is water called the universal solvent?

Universal solvent
High surface tension
Low viscosity
High density

24. What term describes water molecules sticking to each other?

Cohesion
Adhesion
Capillary action
Hydrolysis

25. What term describes water sticking to plant cell walls?

Adhesion
Cohesion
Surface tension
Specific heat

26. Why does ice float on water?

More dense
Less dense
Same density
Variable density

27. How does water act in condensation and hydrolysis reactions?

Only as solvent
Only as product
As reagent and product
Only as reactant

28. What ions are formed when water self-ionizes?

Na⁺ and Cl⁻
H⁺ and OH⁻
H₂O⁺ and OH⁻
H₃O⁺ and OH⁻

29. What is the pH of pure water?

pH 7
pH 0
pH 14
pH 1

30. What substance resists pH change?

Acid
Buffer
Base
Salt

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