The phospholipid bilayer of plasma membranes is semi-permeable, and can regulate transport of some molecules such as ions, but not other molecules that simply diffuse across the phospholipid bilayer. Which of the following molecules would simply diffuse across any plasma membrane? A. proteins B. oxygen C. sodium ions D. nucleotides Which of the following types of bonds in a folded protein resists high temperature denaturation? A. van der Waals forces holding hydrophobic R groups together B. peptide bonds holding amino acids together C. ionic bonds between R groups D. hydrogen bonds between beta sheets

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