Molecular Biophysics MCQs with Answers

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Molecular Biophysics Online Quiz

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• Test Name: Molecular Biophysics MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Molecular Biophysics

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1 / 40

What is the role of NADH in cellular respiration?

Structural support

Hormone

Electron carrier

2 / 40

What is the effect of a competitive inhibitor on an enzyme?

Denatures the enzyme

Competes with substrate for active site

Binds to allosteric site

3 / 40

What is the main function of a lysosome?

Synthesize proteins

Degrade cellular waste

Replicate DNA

4 / 40

What is fluorescence resonance energy transfer (FRET) used for?

Sequence DNA

Measure enzyme activity

Study molecular interactions

5 / 40

What type of bond links amino acids in a protein?

Ionic bond

Peptide bond

Hydrogen bond

6 / 40

What is the main purpose of molecular dynamics simulations?

Amplify RNA

Sequence DNA

Study movement of molecules

7 / 40

What does a Michaelis-Menten plot describe?

Enzyme kinetics

DNA melting

Protein folding

8 / 40

What is an example of a quaternary protein structure?

Alpha helix

Hemoglobin

Beta turn

9 / 40

What is the effect of phosphorylation on proteins?

Degrades the protein

Denatures the protein

Modifies activity and function

10 / 40

Which method is used to measure protein-ligand interactions?

PCR

SDS-PAGE

Surface plasmon resonance

11 / 40

What is the primary force driving protein folding?

Hydrophobic interactions

Ionic bonding

Covalent bonding

12 / 40

What is the function of a ribosome?

Degrade mRNA

Replicate DNA

Synthesize proteins

13 / 40

Which structure forms the backbone of a DNA molecule?

Sugar-phosphate backbone

Fatty acid chains

Peptide bonds

14 / 40

Which molecule acts as the energy currency of the cell?

RNA

DNA

ATP

15 / 40

What technique is commonly used to determine the 3D structure of proteins?

X-ray crystallography

Gel electrophoresis

Northern blotting

16 / 40

What is the purpose of a Western blot?

Amplify DNA

Detect specific proteins

Separate RNA

17 / 40

What is an example of a secondary structure in proteins?

Disulfide bond

Primary sequence

Beta sheet

18 / 40

Which spectroscopy technique is used to determine protein secondary structure?

Mass spectrometry

Circular dichroism

UV-Vis spectroscopy

19 / 40

What is the primary function of DNA polymerase?

Transcribe RNA

Repair DNA

Replicate DNA

20 / 40

What is the function of an ion channel in a cell membrane?

Anchor proteins

Allow ions to pass through

Signal transduction

21 / 40

What is the role of hydrogen bonds in DNA structure?

Stabilize the double helix

Catalyze reactions

Signal transduction

22 / 40

What is a common use of cryo-electron microscopy?

Separate proteins

Determine structures of large complexes

Measure DNA concentration

23 / 40

What technique is used to amplify specific DNA sequences?

Flow cytometry

ELISA

PCR

24 / 40

What is a ligand?

Component of cell membrane

Molecule that binds to a receptor

Enzyme that catalyzes reactions

25 / 40

What is the main role of tRNA in protein synthesis?

Catalyze peptide bonds

Replicate DNA

Transfer amino acids

26 / 40

What does NMR spectroscopy measure in biomolecules?

Protein-ligand interactions

Enzyme activity

Atomic-level structure

27 / 40

Which type of molecule is an enzyme?

Lipid

Carbohydrate

Protein

28 / 40

What is the significance of van der Waals forces in biomolecular interactions?

Form strong covalent bonds

Transfer electrons

Stabilize protein structures

29 / 40

What is the role of hemoglobin?

Transport oxygen

Replicate DNA

Catalyze reactions

30 / 40

What is the purpose of molecular docking in drug design?

Sequence DNA

Determine molecular weight

Predict binding affinity

31 / 40

What is an alpha helix?

A type of tertiary structure

A type of secondary structure

A type of quaternary structure

32 / 40

What is the main function of a mitochondrion?

Synthesize proteins

Produce ATP

Store calcium

33 / 40

Which technique measures the mass-to-charge ratio of ions?

Mass spectrometry

Western blotting

Chromatography

34 / 40

Which technique is used to separate proteins based on size?

SDS-PAGE

NMR spectroscopy

Mass spectrometry

35 / 40

What type of RNA carries the genetic code from DNA to the ribosome?

tRNA

mRNA

rRNA

36 / 40

What is the typical structure of a phospholipid bilayer?

All hydrophilic

Hydrophilic heads and hydrophobic tails

Hydrophobic heads and hydrophilic tails

37 / 40

Which technique uses antibodies to detect specific proteins?

Gel electrophoresis

ELISA

PCR

38 / 40

What is the Gibbs free energy change (ΔG) indicative of in a biochemical reaction?

Temperature dependence

Speed of the reaction

Spontaneity of the reaction

39 / 40

What is the basic unit of chromatin?

Lysosome

Ribosome

Nucleosome

40 / 40

What is the purpose of a molecular chaperone?

Degrade misfolded proteins

Assist in protein folding

Transcribe DNA

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