1. By adding SDS (sodium dodecyl sulfate) during the electrophoresis of proteins, it is possible to: (A) determine a protein’s isoelectric point (B) determine an enzyme’s specific activity (C) determine the amino acid composition of the protein (D) preserve a protein’s native structure and biological activity (E) separate proteins exclusively on the basis of molecular weight.

10. Which of these statements about the composition of biological membranes is false? (A) In a given eukaryotic cell type (for example, a hepatocyte), all intracellular membranes have essentially the same complement of lipids and proteins (B) The carbohydrate found in membranes is virtually all part of either glycolipids or glycoproteins (C) The plasma membranes of the cells of vertebrate animals contain more cholesterol than the mitochondrial membranes (D) The ratio of lipid to protein varies widely among cell types in a single organism (E) Triacylglycerols are not commonly found in membranes

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