Which of the following might be a feature(s) of a lipid that has been converted from a fully saturated fatty acid to a fatty acid containing several trans double bonds? Select all that apply. The trans fatty acid will now have a higher melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack more closely with saturated fatty acids, than with unsaturated fatty acids containing cis double bonds The trans fatty acid will now have a lower melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack most closely with unsaturated fatty acids containing cis double bonds, than with saturated fatty acids

Amino acids have the generic structure seen below, where R represents different carbon-based side chains. Describe how the structure of amino acids allows them to be linked into long peptide chains to form proteins.

If phenylalanine was not an essential amino acid, would diet therapy (the elimination of phenylalanine from the diet) for PKU work?

Tracing Carbon Atom Incorporation in Fatty Acids (Integrates with Chapters 18 and 19.) Use the relationships shown in Figure 24.1 to determine which carbons of glucose will be incorporated into palmitic acid. Consider the cases of both citrate that is immediately exported to the cytosol following its synthesis and citrate that enters the TCA cycle.

Polypeptide folding is often mediated by other proteins called chaperones. Describe how a mutant chaperone protein might be responsible for a genetic disorder involving an enzyme.

Using the ActiveModel for aldose reductase, describe the structure of the TIM barrel motif and the structure and location of the active site.

Explain what happens if even one amino acid is substituted for another in a polypeptide chain. Provide a specific example.

Understanding the Nature of the Ubiquitin-Ubiquitin linkage Draw the structure of the isopeptide bond formed between Gly76of one ubiquitin molecule and Lys48of another ubiquitin molecule.

Saturated fatty acids are so named because they are saturated with (a) hydrogen (b) water (c) hydroxyl groups (d) glycerol (e) double bonds

Which of the following statements about the allosteric site is true? a. The allosteric site is a second active site on a substrate in a metabolic pathway. b. The allosteric site on an enzyme can allow the product of a metabolic pathway to inhibit that enzyme and stop the pathway. c. When the allosteric site of an enzyme is occupied, the reaction is irreversible and the enzyme cannot react again. d. An allosteric activator prevents binding at the active site. e. An enzyme that possesses allosteric sites does not possess an active site.