Refer to the Figure and Table Below

question 218

Multiple Choice

Refer to the figure and table below. At low temperatures, cell membranes become quite immobile and solid-like.If the temperature is gradually increased, a membrane undergoes small changes until a large change in fluidity is observed.The midpoint temperature corresponding to this large change is called the melting temperature.The graph shows how a cell membrane's melting temperature (T_m) is measured.The table shows melting temperature data collected from membranes composed of phospholipids containing different fatty acids.Which statement is consistent with these data?

• A) Increasing chain length or introducing double bonds into fatty acids in membrane phospholipids increases temperature-dependent membrane fluidity.
• B) Increasing chain length or omitting double bonds from fatty acids in membrane phospholipids increases temperature-dependent membrane fluidity.
• C) Decreasing chain length or introducing double bonds into fatty acids in membrane phospholipids increases temperature-dependent membrane fluidity.
• D) Decreasing chain length of fatty acids in membrane phospholipids increases membrane fluidity, but introducing double bonds has no effect on temperature-dependent membrane fluidity.
• E) Increasing chain length of fatty acids in membrane phospholipids increases temperature-dependent membrane fluidity, but introducing double bonds has no effect on fluidity.

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