Understanding Buffers in Biology

What is the pH of a neutral solution at 25°C?

• 0

• 7

• 14

• 1

Which of the following is a common buffer system used in biological laboratories?

• Hydrochloric acid

• Sodium chloride

• Tris buffer

• Ethanol

What is the main role of buffers in biological systems?

• To increase the temperature

• To maintain a stable pH

• To change the color of solutions

• To speed up chemical reactions

Which buffer system is primarily responsible for maintaining blood pH in humans?

• Phosphate buffer system

• Bicarbonate buffer system

• Ammonia buffer system

• Sulfate buffer system

What is the pH range of human blood?

• 6.0 - 6.5

• 7.35 - 7.45

• 8.0 - 8.5

• 5.5 - 6.0

Which of the following is an example of a weak acid used in buffer solutions?

• Hydrochloric acid

• Acetic acid

• Sulfuric acid

• Nitric acid

How does a buffer solution resist changes in pH?

• By evaporating

• By neutralizing added acids or bases

• By changing temperature

• By diluting the solution

Which of the following is a component of the phosphate buffer system in cells?

What happens to the pH of a buffer solution when a small amount of acid is added?

• It increases significantly

• It decreases significantly

• It remains relatively constant

• It becomes neutral

Which of the following is NOT an application of buffers in biology?

• DNA extraction

• Protein purification

• Fuel combustion

• Enzyme activity studies