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- Question
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
- Correct Answer
- the reactants will be favored
- 1. Which of the following amino acid is known as half-cystine residue?
Options- A. Cysteine
- B. Isoleucine
- C. Valine
- D. Histidine Discuss
- 2. Which amino acid when exposed to ninhydrin produces a brown color?
Options- A. Asparagine
- B. Proline
- C. Alanine
- D. Valine Discuss
- 3. 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
- 4. When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes
Options- A. a cation
- B. nonpolar
- C. a zwitterions
- D. an isotope Discuss
- 5. Which of the following is not the hydrophobic and aromatic amino acid?
Options- A. Phenylalanine
- B. Tyrosine
- C. Tryptophan
- D. None of these Discuss
- 6. 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
- 7. 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 Discuss
- 8. 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
- 9. 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
- 10. 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
Thermodynamics and Free Energy problems
Search Results
Correct Answer: Cysteine
Correct Answer: Asparagine
Correct Answer: Aspartate & Glutamate
Correct Answer: a zwitterions
Correct Answer: None of these
Correct Answer: all of the above
Correct Answer: large increase in the entropy of the protein
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°
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