A.1.1.5 Medium for Metabolism

What is the primary reason water can dissolve ionic compounds like sodium chloride?

• Its high surface tension

• Its ability to form covalent bonds

• Its polar nature and ability to form hydration shells

• Its low viscosity

Which of the following best describes the interaction between water molecules and hydrophilic substances?

• Water molecules repel hydrophilic substances

• Water molecules form hydrogen bonds with hydrophilic substances

• Water molecules form ionic bonds with hydrophilic substances

• Water molecules form covalent bonds with hydrophilic substances

Why are non-polar molecules like fats insoluble in water?

• They form strong hydrogen bonds with water

• They are too large to interact with water molecules

• They lack charged regions to interact with water's polar nature

• They are denser than water

What is the effect of temperature on the solubility of oxygen in water?

• Solubility increases with temperature

• Solubility decreases with temperature

• Solubility remains constant regardless of temperature

• Solubility is highest at 37°C

Which of the following statements about hydrophobic substances is true?

• They are repelled by water

• They dissolve easily in water

• They are more attracted to other hydrophobic substances

• They form hydrogen bonds with water

What role do phospholipids play in the transport of fat molecules in blood?

• They dissolve fat molecules in water

• They form a bilayer around fat molecules

• They prevent fat molecules from coalescing by forming a single-layer coating

• They convert fat molecules into water-soluble substances

How does water's polarity contribute to its role as a medium for metabolism?

• It allows water to evaporate easily

• It enables water to dissolve a wide range of substances

• It makes water a poor conductor of electricity

• It increases water's density

Which of the following is a characteristic of a hydrophilic amino acid?

• It has a non-polar side chain

• It is insoluble in water

• It has charged or polar side chains

• It forms covalent bonds with water

What is the primary reason glucose is soluble in water?

• It is a non-polar molecule

• It forms ionic bonds with water

• It is a polar molecule

• It is a large molecule

Which of the following best explains why water is not a universal solvent?

• It cannot dissolve non-polar substances

• It has a low boiling point

• It is too dense

• It evaporates quickly