6. The conversion of CH_(3)-stackrel ({)(C)-CCH_(3)arrow CH_(3)CH_(2)OH-ii A. Oxidation B. Dehydration C. Reduction D. Hydrolysis E. Hydration 7. The isoelectric point of a protein is A. The pH at which the protein molecule has no charges on its surface. B. The pH at which a protein in solution has an equal number of positive and negative charges. C. The electric charge under isothermal conditions. D. The pH at which a protein is positively charged E. The pH at which a protein exist as an acid 8. What property of low -molecular weight aldehydes and ketones accounts for the magnitude of their boiling points? A. The ability to form strong H-bonds between their molecules. B. The ability of the carbonyl oxygen to form H-bonds with other carbonyl groups. C. The ability of the polar carbonyl group to attract other polar molecules. D. The ability of the carbonyl group to attract electrophiles and form bonds. E. The ability of hydrogen to attract nucleophile 9. Which of the statement below correctly defines the term pKa A. Equilibrium constant for the dissociation of HA to A^- and H^+ B. Ion constant of water C. Negative log of the concentration of H+ D. pH at which a molecule is neutrally charged E. pH at which an equivalent distribution of acid and conjugate base exist in solution 10. Choose a statement that BEST describes the characteristics of polar amino acids A. Ionisable in water B. More likely to be exposed to water than to be found in the interior of a folded protein C. Partially charged due to the oxygen atom in their carboxyl group

Question

6. The conversion of CH_(3)-stackrel ({)(C)-CCH_(3)arrow CH_(3)CH_(2)OH-ii A. Oxidation B. Dehydration C. Reduction D. Hydrolysis E. Hydration 7. The isoelectric point of a protein is A. The pH at which the protein molecule has no charges on its surface. B. The pH at which a protein in solution has an equal number of positive and negative charges. C. The electric charge under isothermal conditions. D. The pH at which a protein is positively charged E. The pH at which a protein exist as an acid 8. What property of low -molecular weight aldehydes and ketones accounts for the magnitude of their boiling points? A. The ability to form strong H-bonds between their molecules. B. The ability of the carbonyl oxygen to form H-bonds with other carbonyl groups. C. The ability of the polar carbonyl group to attract other polar molecules. D. The ability of the carbonyl group to attract electrophiles and form bonds. E. The ability of hydrogen to attract nucleophile 9. Which of the statement below correctly defines the term pKa A. Equilibrium constant for the dissociation of HA to A^- and H^+ B. Ion constant of water C. Negative log of the concentration of H+ D. pH at which a molecule is neutrally charged E. pH at which an equivalent distribution of acid and conjugate base exist in solution 10. Choose a statement that BEST describes the characteristics of polar amino acids A. Ionisable in water B. More likely to be exposed to water than to be found in the interior of a folded protein C. Partially charged due to the oxygen atom in their carboxyl group

Answer 1

6. The correct answer is E. Hydration.The conversion of

is called hydration. In this reaction, water (H2O) is added to the molecule, resulting in the formation of an alcohol (CH3CH2OH).7. The correct answer is B. The pH at which a protein in solution has an equal number of positive and negative charges.The isoelectric point (pI) of a protein is the pH at which the protein molecule has no net charge, meaning it has an equal number of positive and negative charges. At this pH, the protein is electrically neutral and does not migrate in an electric field.8. The correct answer is A. The ability to form strong H-bonds between their molecules.The magnitude of the boiling points of low-molecular weight aldehydes and ketones is primarily due to their ability to form strong hydrogen bonds between their molecules. The polar carbonyl group (C=O) in aldehydes and ketones can form hydrogen bonds with other polar molecules, leading to higher boiling points.9. The correct answer is A. Equilibrium constant for the dissociation of HA to

and

.The term pKa is defined as the negative logarithm of the acid dissociation constant (Ka) for the dissociation of a weak acid (HA) into its conjugate base (

) and a hydrogen ion (

). The pKa value is a measure of the strength of the acid, with lower pKa values indicating stronger acids.10. The correct answer is B. More likely to be exposed to water than to be found in the interior of a folded protein.Polar amino acids are more likely to be exposed to water than to be found in the interior of a folded protein. This is because the polar side chains of these amino acids can interact with water molecules, making them more soluble and accessible to the surrounding environment.

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