Biology Unit 2- Biochemistry

How does the polarity of water molecules influence its ability to dissolve substances?

• It allows water to dissolve only non-polar substances.

• It allows water to dissolve both polar and ionic substances.

• It prevents water from dissolving any substances.

• It allows water to dissolve only gases.

Which macromolecule is primarily responsible for storing genetic information?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

What is the role of enzymes in biochemical reactions?

• They increase the activation energy required for reactions.

• They decrease the activation energy required for reactions.

• They are consumed in the reactions they catalyze.

• They prevent reactions from occurring.

Which property of water is most important for its role as a solvent in biological systems?

• High heat capacity

• Cohesion

• Polarity

• Low density in solid form

Which macromolecule serves as the main source of energy for cellular processes?

• Nucleic acids

• Proteins

• Carbohydrates

• Lipids

What is the effect of temperature on enzyme activity?

• Enzyme activity decreases with increasing temperature indefinitely.

• Enzyme activity increases with increasing temperature indefinitely.

• Enzyme activity increases with temperature up to a point, then decreases.

• Temperature has no effect on enzyme activity.

How does water's high specific heat capacity benefit living organisms?

• It allows organisms to maintain stable internal temperatures.

• It causes rapid temperature changes in organisms.

• It prevents water from being a good solvent.

• It makes water a poor insulator.

Which macromolecule is primarily involved in catalyzing biochemical reactions?

• Lipids

• Proteins

• Carbohydrates

• Nucleic acids

What is the role of the active site in an enzyme?

• It is where substrates bind and reactions are catalyzed.

• It is where the enzyme is stored.

• It is where the enzyme is synthesized.

• It is where the enzyme is degraded.

Why is water's ability to form hydrogen bonds important for life?

• It allows water to be a non-polar solvent.

• It contributes to water's high boiling point and surface tension.

• It makes water a poor solvent for ionic compounds.

• It prevents water from interacting with other molecules.