Draw glutamic acid & glutamine. Explain difference in pI

Draw out the complete structural formula for glutamic acid and glutamine. One has a pI of 5.65 and the other has a pI of 3.22. GIve a reason for the differences in the isoelectric points of these two compounds.

Proteins - primary vs secondary structures

Proteins Can there be a secondary structure without a primary structure? Why or why not? Can there be a primary structure without a secondary structure? Why or why not? What types of bonds are responsible for the secondary structure of a protein? How would the addition of a heavy metal affect the secondary structure ...continues

electrophoresis of arginine, alanine, aspartic acid

Describe what would happen if you conducted an electrophoresis of a mixture of arginine, alanine, and aspartic acid, using a buffer with pH of 7.0. Should you place the mixture of amino acids at one end of the starch gel or in the middle?

Current through proteins, which amino acid would migrate where

A direct current was passed through a solution containing alanine, histidine, and aspartic acid at a pH of 6.0. One amino acid migrated to the cathode (+) and one migrated to the anode (-) and the other remained atationary. Match the behavior with correct amino acid. The isoelectric point of histidine is 10.0.

Proteins/write structural formual & determine acidic/basic/neutral

Alanine has an R-group structure of CH3, cysteine has an R-group structure of HS-CH2, and aspartic acid has an R-group structure of HOOC-CH2 Write out the structural formula for this tripeptide, asp-ala-cys Is the tripeptide basic, acidic, or neutral? How can you tell?

tetrapeptides of 2 alanine & 2 valine

How many different tetrapeptides containing 2 molecules of alanine and 2 molecules of valine could theoretically exist? What are they? Write in shorthand.

Proteins/Drawing structural formulas

Draw the structural formulas for: Threonine methionine Thr-Met

Structure of alanine at pH of 3.0, 6.0, and 10.0

The isoelectric pH of alanine is 6.0. Write the structure of alanine for pH 3.0 pH 6.0 pH 10.0

Threonine & Leucine/which inside globular protein & why

Which of the amino acids, threonine and leucine, would you expect to find on the inside of a globular protein and which would you expect on the outside, if either? WHY??????

Structural formula for asp-ala-cys/acid, base, neutral, why?

Alanine has an R-group structure of CH3, cysteine has an R-group structure of HS-CH2, and aspartic acid has an R-group structure of Hooc-CH2. Write out the structural formula for this tripeptide, asp-ala-cys Is that tripeptide basic, acidic, or neutral? HOW CAN YOU TELL?