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Cell Disruption and Homogenization

Description: This quiz will evaluate your understanding of cell disruption and homogenization techniques, which are essential steps in sample preparation for various biological and biochemical analyses. The questions cover different methods, principles, and applications of cell disruption and homogenization.
Number of Questions: 15
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Tags: cell disruption homogenization sample preparation biotechnology
Attempted 0/15 Correct 0 Score 0

Which of the following is NOT a mechanical method of cell disruption?

  1. Bead beating

  2. Ultrasonication

  3. Enzymatic digestion

  4. Grinding


Correct Option: C
Explanation:

Enzymatic digestion is a chemical method of cell disruption, while bead beating, ultrasonication, and grinding are mechanical methods.

The principle behind bead beating for cell disruption is:

  1. High-speed rotation of beads in a closed container

  2. Sonication waves generated by a probe

  3. Rapid temperature changes causing cell lysis

  4. Chemical digestion of the cell wall


Correct Option: A
Explanation:

Bead beating involves agitating cells with small beads in a closed container at high speeds, causing cell disruption due to mechanical forces.

Which cell disruption method is commonly used for preparing protein extracts?

  1. French press

  2. Dounce homogenizer

  3. Ultrasonication

  4. Cryogenic grinding


Correct Option: A
Explanation:

The French press is a widely used method for protein extraction, as it efficiently disrupts cells and releases intracellular proteins without causing significant protein denaturation.

What is the primary advantage of using ultrasonication for cell disruption?

  1. Low energy consumption

  2. Minimal sample heating

  3. Selective disruption of specific cell types

  4. Rapid and efficient cell lysis


Correct Option: D
Explanation:

Ultrasonication is known for its rapid and efficient cell disruption due to the cavitation effect generated by high-frequency sound waves.

Which type of homogenizer is commonly used for disrupting plant cells?

  1. Dounce homogenizer

  2. Potter-Elvehjem homogenizer

  3. Waring blender

  4. Tissue grinder


Correct Option: D
Explanation:

Tissue grinders are commonly used for disrupting plant cells due to their ability to handle larger sample volumes and their effectiveness in breaking down tough plant cell walls.

What is the main purpose of homogenization in cell disruption?

  1. Breaking down cell walls

  2. Releasing intracellular components

  3. Separating organelles

  4. Purifying specific molecules


Correct Option: B
Explanation:

Homogenization aims to release intracellular components by breaking down cell walls and membranes, allowing for the extraction and analysis of cellular contents.

Which of the following is NOT a factor that affects the efficiency of cell disruption?

  1. Cell size

  2. Cell wall composition

  3. Sample volume

  4. Homogenization speed


Correct Option: C
Explanation:

Sample volume is not a factor that directly affects the efficiency of cell disruption, as it is typically adjusted to ensure optimal conditions for the chosen method.

What is the primary mechanism of cell disruption in cryogenic grinding?

  1. Mechanical force

  2. Sonication waves

  3. Chemical digestion

  4. Rapid temperature changes


Correct Option: D
Explanation:

Cryogenic grinding involves freezing the sample in liquid nitrogen and then grinding it at very low temperatures. The rapid temperature changes cause cell disruption due to the formation of ice crystals.

Which homogenization method is suitable for disrupting delicate cells or tissues?

  1. French press

  2. Dounce homogenizer

  3. Waring blender

  4. Tissue grinder


Correct Option: B
Explanation:

The Dounce homogenizer is designed for disrupting delicate cells or tissues, as it uses a loose-fitting pestle that minimizes mechanical stress and prevents cell damage.

What is the role of buffers in cell disruption and homogenization?

  1. Maintaining pH

  2. Preventing protein denaturation

  3. Inactivating enzymes

  4. All of the above


Correct Option: D
Explanation:

Buffers play a crucial role in cell disruption and homogenization by maintaining pH, preventing protein denaturation, and inactivating enzymes that could degrade cellular components.

Which cell disruption method is commonly used for preparing nucleic acid extracts?

  1. French press

  2. Dounce homogenizer

  3. Ultrasonication

  4. Cryogenic grinding


Correct Option: C
Explanation:

Ultrasonication is often used for preparing nucleic acid extracts, as it effectively disrupts cells and releases nucleic acids without causing significant degradation.

What is the main advantage of using enzymatic methods for cell disruption?

  1. Rapid cell lysis

  2. Minimal sample heating

  3. Selective disruption of specific cell types

  4. Preservation of cellular structures


Correct Option: C
Explanation:

Enzymatic methods offer the advantage of selective disruption of specific cell types, as enzymes can be chosen that specifically target and degrade the cell walls or membranes of desired cells.

Which homogenization method is suitable for large-scale sample processing?

  1. French press

  2. Dounce homogenizer

  3. Waring blender

  4. Tissue grinder


Correct Option: C
Explanation:

The Waring blender is commonly used for large-scale sample processing, as it can handle larger volumes and provides efficient homogenization.

What is the primary mechanism of cell disruption in bead beating?

  1. Mechanical force

  2. Sonication waves

  3. Chemical digestion

  4. Rapid temperature changes


Correct Option: A
Explanation:

Bead beating involves agitating cells with small beads in a closed container at high speeds, causing cell disruption due to mechanical forces.

Which of the following is NOT a type of homogenizer?

  1. French press

  2. Dounce homogenizer

  3. Ultrasonicator

  4. Tissue grinder


Correct Option: C
Explanation:

Ultrasonicator is a device used for ultrasonication, which is a cell disruption method, not a type of homogenizer.

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