Practice Quiz

IB Biology Exam Prep - Question List

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71.
The ability of plants to transport water and dissolved nutrients against the force of gravity is directly attributable to the:
  1. Cohesion of water molecules.
  2. Breaking of hydrogen bonds in liquid water.
  3. Temperature-induced changes in water density.
  4. High specific heat of liquid water.
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72.
A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
  1. 2x
  2. 10x
  3. 1000x
  4. 2000x
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73.
The immense diversity of biological molecules results most directly from the:
  1. Reactivity of oxygen.
  2. Mass of phosphorus.
  3. Availability of nitrogen.
  4. Structure of carbon.
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74.
Biologically important properties of water such as its cohesion, high specific heat, anomalous phase densities, and role as a solvent can be attributed primarily to the:
  1. Tendency of water molecules to form double bonds.
  2. Hydrogen bonds that form between water molecules.
  3. Relatively low molecular weight of water compared to other liquids.
  4. Ability of water to dissociate into hydrogen and hydroxide ions.
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75.
Saturated fats are best distinguished from unsaturated fats by the fact that saturated fats:
  1. Are more likely to be solid at room temperature.
  2. Contain more cholesterol.
  3. Are more common in plants than in animals.
  4. Contain more double bonds.
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