Biochemistry pKa Flashcards

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Questions and Answers

What is the value of C pKa?

6
8.18 (correct)
4.25
3.65

What is the value of D pKa?

3.65

What is the value of E pKa?

4.25

What is the value of H pKa?

6 Signup and view all the answers

What is the value of K pKa?

10.53 Signup and view all the answers

What is the value of Y pKa?

10.07 Signup and view all the answers

What is the value of R pKa?

12.48 Signup and view all the answers

Flashcards

What is the pKa of Cysteine?

The pKa value of the amino acid Cysteine (Cys) is 8.18.

What is the pKa of Aspartic Acid?

The pKa value of the amino acid Aspartic Acid (Asp) is 3.65.

What is the pKa of Glutamic Acid?

The pKa value of the amino acid Glutamic Acid (Glu) is 4.25.

What is the pKa of Histidine?

The pKa value of the amino acid Histidine (His) is 6.

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What is the pKa of Lysine?

The pKa value of the amino acid Lysine (Lys) is 10.53.

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What is the pKa of Tyrosine?

The pKa value of the amino acid Tyrosine (Tyr) is 10.07.

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What is the pKa of Arginine?

The pKa value of the amino acid Arginine (Arg) is 12.48.

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Study Notes

Amino Acid pKa Values

C pKa: 8.18, indicating the pH at which half of the cysteine molecules are deprotonated.
D pKa: 3.65, representing aspartic acid's acidic behavior; it loses a proton in moderately acidic conditions.
E pKa: 4.25, correlates with the protonation state of glutamic acid at physiological pH, affecting enzyme activity.
H pKa: 6, highlights histidine's unique role as a buffer; it can be protonated or deprotonated near physiological pH.
K pKa: 10.53, showcases lysine's basic nature, where it remains protonated at physiological pH values.
Y pKa: 10.07, reflects tyrosine’s ability to act as both an acid and a base, impacting protein interactions.
R pKa: 12.48, indicates arginine's high pKa, demonstrating its strong basicity and significance in enzyme catalysis.

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Description

Test your knowledge on the pKa values of various amino acids with these flashcards. Each card displays the amino acid and its corresponding pKa value, helping you understand their properties and classifications. Perfect for students in biochemistry or related fields.