Class Date Indicate the answer choice that best completes the statement or answe
ID: 97536 • Letter: C
Question
Class Date Indicate the answer choice that best completes the statement or answers the question 1. The pKa values of the alpha carboxyl groups ofcommon amino acids are around a. pH 2 b. pH 5 cpH 7 d. pH 9 2. What is the charge on the tetrapeptide lys-lys-his-glu at plH 7? a. 0 b. +1 c. +2 d.-1 3. What is the predominant form of the amino acid abbreviated R at pH 7? a. positive b. neutral c. negative Exhibit 3A (for this chapter) -carboxyl group pk, 2.3 2.2 2.1 2.2 1.7 1.8 2.2 2.1 Amino acid a-amino group pk, 9.7 9.0 9.0 9.8 10.8 9.2 9.2 9.1 R-group pk Ala 12.5 Asn or Gln Asp or Glu Cys His Ser Tyr 4.0 8.3 6.0 0.1 4. Refer to Exhibit 3A. What is the order of the pls in increasing order (from acid to base)? a. Alanine, Arginine, Asparagine, Cysteine, and Aspartic Acid b. Aspartic Acid, Alanine, Asparagine, Cysteine, and Arginine c. Aspartic Acid, Cysteine, Asparagine, Alanine, and Arginine d. Arginine, Alanine, Asparagine, Cysteine, and Aspartic Acid e. Aspartic Acid, Cysteine, Arginine, Alanine, and Asparagine, 5. What is the predominant form of the amino acid abbreviated val at plH 7? a. positive b. neutral c. negativeExplanation / Answer
chapter 3 quiz
1) a because pH value of alpha carboxyl acid group lie in small range of pH
2)a
3)b
3a....
4)d
5)b
6)b
7)b
8)c
9)d
10)b
11)d
12)a
13)d
14)a
15)c
16)b
17)a
18)d
19)a
20)d