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Leucine zippers are pairs of α-helices in which the side chains of evenly spaced leucines form extensive contacts. A typical leucine zipper is shown below. Select the type of interaction that helps to stabilize this structure. image009601c63e5.jpg

Select the characteristic that is common to the structures of α-helices and β-sheets.

Determine the stereochemistry of each amino acid in the dipeptide below. Enter D or L. Ax3aSA_peptideStructure.png N-terminal amino acid [BLANK-1] C-terminal amino acid [BLANK-2]

Identify the amino acid that will have a net charge of +1 at pH 7.

Some leukemias can be treated by introducing asparaginase into blood. This enzyme degrades asparagine, which is required for cancer cell growth. The graph below shows vo vs. [S] plots for two different asparaginases. The arrow below the horizontal axis marks the concentration of asparagine in the blood. Select the best enzyme and rationale that explains which will be most effective in removing asparagine in the blood.image016601c63e5.gif

This dipeptide contains only one measurable phi (φ) torsion angle. Click on the bond around which it is measured.

Click on the oxygen atom of the depicted dipeptide that is incorrectly displayed at physiological pH (pH 7.4).

The side chain of which amino acid below is most likely to be buried in the hydrophobic core of a protein? HSLKP.png 

Given the progress curve below for the uncatalyzed reaction L-Pro ↔ D-Pro, identify the correct response to each prompt. AxSA6c.png

Using specific Scriptural support, explain the origin of the command not to eat meat offered to idols, the four reasons Paul gives for not eating meat offered to idols, as well as the exception to the Jerusalem council’s command that Paul allows.