37. The "Wobble Hypothesis" explains which ofthe following phenomena in protein synthesis? (A) The ability of the ribosome to pause during synthesis of hydrophobic regions. (B) The flexibility of the ribosome to translate different mRNA start codons. (C) The ability of a single tRNA anticodon to base pair with more than one mRNA codon. (D) The error-prone nature of the peptidyl transferase center. (E) The sliding of RNA polymerase backward during transcription proofreading.

9. Phospholipids are the primary structural components of the cell membrane bilayer. Which of the following descriptions regarding the function of phospholipids in the membrane bilayer is the most accurate? (A) Phospholipids, through their amphipathic nature, spontaneously form a barrier that prevents the free movement of water-soluble substances in and out of the cell. (B) The primary function of phospholipids is to act as active transport pumps, directly consuming ATP to move ions across the membrane. (C) Phospholipids remain in a fixed, static state within the membrane to provide mechanical rigidity and replace the need for a cytoskeleton. (D) The main function of phospholipids is to act as enzymes that catalyze the translation and modification of membrane (E) proteins. Phospholipids use their hydrophilic tails to create channels in the membrane core to facilitate the simple diffusion of large polar molecules.

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