Biology Lesson 3b

What is a unique property of water that is crucial for biological functions?

• It is a good solvent

• It is highly compressible

• It is non-polar

• It has a low specific heat

How does water's polarity influence its interactions with other substances?

• It repels ionic compounds

• It forms hydrogen bonds with other polar molecules

• It only interacts with gases

• It decreases the boiling point of substances

Why are buffers important to the survival of an organism?

• They prevent DNA replication

• They increase metabolic rates

• They maintain pH stability in cells

• They promote water retention

What property of water molecules is described in the image?

• Nonpolar

• Ionic

• Covalent

• Polar

What type of bond is illustrated in the diagram where a hydrogen atom is shown interacting with an oxygen atom?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Metallic bond

What does the term "cohesion" refer to in the context of molecular attraction?

• Attraction between molecules of different substances

• Repulsion between molecules of the same substance

• Attraction between molecules of the same substance

• Repulsion between molecules of different substances

What does the term "adhesion" refer to in the context of molecular interactions?

• The repulsion between molecules of the same substance

• The attraction between molecules of different substances

• The total absence of molecular interaction

• The process by which molecules form a gas

What is the definition of heat capacity?

• The amount of heat required to change the state of a substance

• The amount of energy needed to raise a substance's temperature by making its molecules move faster

• The temperature increase when heat is applied to a substance

• The resistance of a substance to change in temperature

What property of water allows it to dissolve both ionic compounds and other polar molecules?

• Covalent bonding

• Polarity

• Hydrophobic interaction

• Ionic bonding

What does a low pH value indicate about a solution?

• It is neutral

• It is basic

• It is acidic

• It has no hydrogen ions