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28. Which of the following is a correct bond-line structure for the tripeptide Val-Asp-Ala? OH H2N...
Which of the following is a correct bond-line structure for a tripetide Val-Aso-Ala? Draw a bond-line structure for the tetrapetide Ala-Ser-Cys-Phe
Which one of the following represents a tetrapeptide? A) Val-Ile-Asp-Asp B) Ala-Ala-Ala-Ala-Val-Val C) Ala-Ser-Val-Val-Ile D) Ser-Ser-Ala-Ala-Gly-Gly-Glu-Glu E) Ser-Ala-Thr-Pro-Leu In the octapeptide, Cys-Ile-Ser-Asp-Gly-His-Gly-Gly, which is the N-terminal amino acid A) Ser B) Ile C) Asp D) Cys E) Gly If an amino acid has one carboxyl group and one amino group, and the pka's are 2.4 and 9.8 respectively, what is its isoelectric point? A) 3.7 B) 6.1 C) 7.0 D) 7.9 E) 12.2 Which of the following will migrate toward...
1. which tripeptide will most likely line the opening of a Cl- channel? a. His-Lys-Arg b. Gly-Pro-Arg c. Asp-Trp-Tyr d. Asp-Ala-Glu e. Leu-Val-Phe 2. Which tripeptide will most likely line the opening of a K+ channel? (consider side chains at physiological pH) a. His-Lys-Arg b. Gly-Pro-Arg c. Asp-Trp-Tyr d. Asp-Ala-Glu e. Leu-Val-Phe
Draw the structure of a tripeptide Gln-Ile-Asp with the correct ionization at pH 7.
Consider the following amino acid sequence, found as part of a larger protein: Pro-Gly-Asp-Val-Gln-Phe-Asp-Ile-Arg-Ala-Asp-Gly What kind of structure do you expect this peptide segment be a part of? Where on the protein is this likely to occur?
The correct structure for Lysine at pH 2.5 is: O H2N-CH-C 0 *HAN-CH=C- o H2N-CH-C-OH "HN-CH-C-OH CH2 CH2 CH2 CH2 CH CH CH2 CHE ÇH₂ NH2 NH, NH NH" b
Which of these protein sequences is most likely to span a cell
membrane?
Gly-Asp-Val-Ala-Gly-Arg-Gly-Asn-Gly-Lys-Lys-Pro-Ser-Ser-Val-Arg-Ala-Leu-Ser Ile-Val-Leu-Pro-Ile-Val-Leu-Leu-Val-Phe-Leu-Cys-Leu-Gly-Val-Phe-Leu-Leu-Trp Lys-Asn-Trp-Arg-Leu-Lys-Asn-Ile-Asn-ser-Ile-Asn-Phe-Asp-Asn-Pro-Val-Tyr-Gln A. 773 B. 792 C. 811
1. The C-terminal amino acid of the hexapeptide, Asp-Ala-ser-Glu-Val-Arg is; 2. Which of the following would be observed in a person after one week of starvation? A. The brain uses glucose and ketone bodies B. Liver glycogen stores are only partially depleted due to an increase in gluconeogenesis C. Fatty acids from adipose stores are the major source of energy for red blood cells D. Muscle glycogen stores are used to maintain glucose E. Nitrogen balance is maintained because muscle...
16. Draw the structure of the tri-peptide Val-Ser-Asn that forms from the following three amino acids NH2 དང་ད་ H2N COOH H2N COOH Valine (Val, H2N COOH Serine (Ser, S) Asparagine (Asn, N)
10. The peptide shown has the amino acid sequence: A. Val-Ser-Ile-Glu-Lys B. Lys-Glu-Ile-Ser-Val C. Thr-Asp-Leu-Gln-Arg D. Val-Asp-Ile-Glu-Arg 11. Which of the following describes the entire three- dimensional structure of a single polypeptide? A. Secondary structure B. Quaternary structure C. Tertiary structure D. Primary structure 12. What is the primary driving force in the formation of protein tertiary structure? A. Energy released when additional ion pairs are formed. B. The exclusion of non-polar substances from aqueous solution. C. The formation of...