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Biophysical Techniques

Description: This quiz covers various biophysical techniques used to study biological systems at the molecular and cellular level.
Number of Questions: 15
Created by:
Tags: biophysics biophysical techniques molecular biology cellular biology
Attempted 0/15 Correct 0 Score 0

Which technique separates molecules based on their size and charge?

  1. Gel Electrophoresis

  2. Chromatography

  3. Spectrophotometry

  4. Microscopy


Correct Option: A
Explanation:

Gel electrophoresis is a technique used to separate molecules based on their size and charge. It is commonly used to separate DNA, RNA, and proteins.

What is the principle behind spectrophotometry?

  1. Absorption of light by molecules

  2. Scattering of light by molecules

  3. Fluorescence of molecules

  4. Refraction of light by molecules


Correct Option: A
Explanation:

Spectrophotometry is a technique that measures the absorption of light by molecules. The amount of light absorbed is proportional to the concentration of the molecule in the sample.

Which technique allows for the visualization of cells and tissues at high magnification?

  1. Microscopy

  2. Gel Electrophoresis

  3. Chromatography

  4. Spectrophotometry


Correct Option: A
Explanation:

Microscopy is a technique that allows for the visualization of cells and tissues at high magnification. It is commonly used in biology to study the structure and function of cells.

What is the purpose of centrifugation?

  1. To separate particles based on their size and density

  2. To measure the concentration of molecules in a sample

  3. To visualize cells and tissues at high magnification

  4. To determine the molecular weight of a protein


Correct Option: A
Explanation:

Centrifugation is a technique used to separate particles based on their size and density. It is commonly used to separate cells, organelles, and macromolecules.

Which technique is used to determine the molecular weight of a protein?

  1. Gel Electrophoresis

  2. Chromatography

  3. Mass Spectrometry

  4. Spectrophotometry


Correct Option: C
Explanation:

Mass spectrometry is a technique used to determine the molecular weight of a protein. It works by ionizing the protein and measuring the mass-to-charge ratio of the ions.

What is the principle behind fluorescence spectroscopy?

  1. Absorption of light by molecules

  2. Emission of light by molecules

  3. Scattering of light by molecules

  4. Refraction of light by molecules


Correct Option: B
Explanation:

Fluorescence spectroscopy is a technique that measures the emission of light by molecules. It is commonly used to study the structure and dynamics of proteins and nucleic acids.

Which technique is used to study the interactions between molecules?

  1. Isothermal Titration Calorimetry

  2. Gel Electrophoresis

  3. Chromatography

  4. Spectrophotometry


Correct Option: A
Explanation:

Isothermal titration calorimetry is a technique used to study the interactions between molecules. It measures the heat released or absorbed when two molecules bind to each other.

What is the purpose of circular dichroism spectroscopy?

  1. To determine the secondary structure of proteins

  2. To measure the concentration of molecules in a sample

  3. To visualize cells and tissues at high magnification

  4. To determine the molecular weight of a protein


Correct Option: A
Explanation:

Circular dichroism spectroscopy is a technique used to determine the secondary structure of proteins. It measures the difference in absorption of left- and right-circularly polarized light by the protein.

Which technique is used to study the dynamics of proteins?

  1. Nuclear Magnetic Resonance Spectroscopy

  2. Gel Electrophoresis

  3. Chromatography

  4. Spectrophotometry


Correct Option: A
Explanation:

Nuclear magnetic resonance spectroscopy is a technique used to study the dynamics of proteins. It provides information about the structure, dynamics, and interactions of proteins in solution.

What is the principle behind X-ray crystallography?

  1. Diffraction of X-rays by crystals

  2. Absorption of X-rays by molecules

  3. Scattering of X-rays by molecules

  4. Refraction of X-rays by molecules


Correct Option: A
Explanation:

X-ray crystallography is a technique that uses the diffraction of X-rays by crystals to determine the structure of molecules. It is commonly used to determine the structure of proteins, nucleic acids, and other macromolecules.

Which technique is used to study the interactions between proteins and nucleic acids?

  1. Electrophoretic Mobility Shift Assay

  2. Gel Electrophoresis

  3. Chromatography

  4. Spectrophotometry


Correct Option: A
Explanation:

Electrophoretic mobility shift assay is a technique used to study the interactions between proteins and nucleic acids. It measures the change in the electrophoretic mobility of a nucleic acid when it binds to a protein.

What is the purpose of surface plasmon resonance spectroscopy?

  1. To study the interactions between molecules

  2. To measure the concentration of molecules in a sample

  3. To visualize cells and tissues at high magnification

  4. To determine the molecular weight of a protein


Correct Option: A
Explanation:

Surface plasmon resonance spectroscopy is a technique used to study the interactions between molecules. It measures the change in the refractive index of a surface when molecules bind to it.

Which technique is used to study the structure of proteins in solution?

  1. Small-Angle X-ray Scattering

  2. Gel Electrophoresis

  3. Chromatography

  4. Spectrophotometry


Correct Option: A
Explanation:

Small-angle X-ray scattering is a technique used to study the structure of proteins in solution. It provides information about the overall shape and size of the protein.

What is the principle behind atomic force microscopy?

  1. Scanning a surface with a sharp tip

  2. Absorption of light by molecules

  3. Scattering of light by molecules

  4. Refraction of light by molecules


Correct Option: A
Explanation:

Atomic force microscopy is a technique that uses a sharp tip to scan a surface. It provides information about the topography of the surface at the nanometer scale.

Which technique is used to study the interactions between cells?

  1. Cell-Cell Adhesion Assay

  2. Gel Electrophoresis

  3. Chromatography

  4. Spectrophotometry


Correct Option: A
Explanation:

Cell-cell adhesion assay is a technique used to study the interactions between cells. It measures the strength of the adhesion between two cells.

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