Lysine Contains Two Amine Groups (PK_a Values of 9

question 12

Multiple Choice

Lysine contains two amine groups (pK_a values of 9.0 and 10.0) and a carboxylic acid group (pK_a 2.2) . In a solution of pH 9.5, which of the following would best describe the protonation and charge state of lysine?

• A)carboxylic acid: deprotonated and neutral; both amines: protonated and positive
• B)carboxylic acid: deprotonated and negative; both amines: deprotonated and neutral
• C)carboxylic acid: deprotonated and negative; amine (pK_a 9.0): deprotonated and neutral; amine (pK_a 10.0): protonated and positive
• D)carboxylic acid: deprotonated and negative; amine (pK_a 9.0): protonated and positive; amine (pK_a 10.0): deprotonated and neutral
• E)carboxylic acid: deprotonated and neutral; amine (pK_a 9.0): deprotonated and neutral; amine (pK_a 10.0): protonated and positive

Comprehend how marginal and average tax rates operate and their implications on taxable income.

Recognize the impact of tax policies on different income groups, including the economic behaviors it incentivizes.

Identify major sources of federal revenue and understand the budget allocation to different expenditures.

Understand the historical and current tax rates, and predict the effects of future changes in tax legislation.

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