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- Question
The unfolding of regular secondary structure causes
Options- A. little increase in the entropy of protein
- B. large decrease in the entropy of the protein
- C. no change in the entropy of the protein
- D. large increase in the entropy of the protein
- Correct Answer
- large increase in the entropy of the protein
- 1. Reactions that have positive standard free energy changes (?Go> 0) can be made to occur in cells by
Options- A. coupling them with exergonic reactions via a common intermediate
- B. manipulating the concentrations of products and reactants such that G/<0
- C. coupling them to the hydrolysis of ATP
- D. all of the above Discuss
- 2. If the Standard Gibb's free energy, ?G°, for a reaction is positive then
Options- A. the products will be favored
- B. the reactants will be favored
- C. the concentration of the reactants and products will be equal
- D. all of the reactant will be converted to product Discuss
- 3. Which of the following amino acid is known as half-cystine residue?
Options- A. Cysteine
- B. Isoleucine
- C. Valine
- D. Histidine Discuss
- 4. Which amino acid when exposed to ninhydrin produces a brown color?
Options- A. Asparagine
- B. Proline
- C. Alanine
- D. Valine Discuss
- 5. Which of the following pairs of amino acids would carry a negative charge on their side chain at pH 8.0?
Options- A. Asparagine & Glutamine
- B. Leucine & Glycine
- C. Histidine & Lysine
- D. Aspartate & Glutamate Discuss
- 6. The Standard Gibb's free energy, ?G°, is
Options- A. the residual energy present in the reactants at equilibrium
- B. the residual energy present in the products at equilibrium
- C. the difference in the residual energy of reactants and products at equilibrium
- D. the energy required to convert one mole of reactants to one mole of products Discuss
- 7. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are
Options- A. much stronger in proteins than in water
- B. not reformed with water
- C. slightly weaker in proteins than in water
- D. slightly stronger in proteins than in water Discuss
- 8. If the enthalpy change for a reaction is zero, ?G° is equal to
Options- A. T?S°
- B. -T?S°
- C. -?H°
- D. lnKeq Discuss
- 9. In ion-exchange chromatography
Options- A. proteins are separated on the basis of their net charge
- B. proteins are separated on the basis of their size
- C. proteins are separated on the basis of their shape
- D. either (b) or (c) Discuss
- 10. Which of the following may be added to stabilize the protein after yeast cells disruption?
Options- A. NaCl
- B. Protease inhibitor
- C. AMP
- D. All of these Discuss
Thermodynamics and Free Energy problems
Search Results
Correct Answer: all of the above
Correct Answer: the reactants will be favored
Correct Answer: Cysteine
Correct Answer: Asparagine
Correct Answer: Aspartate & Glutamate
Correct Answer: the energy required to convert one mole of reactants to one mole of products
Correct Answer: slightly stronger in proteins than in water
Correct Answer: -T?S°
Correct Answer: proteins are separated on the basis of their net charge
Correct Answer: All of these
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