How many of the molecules shown in the figure are sphingolipids? E) five C) three a} \\J ' e, ~ How many of these structures are fatty acids? #9 IV ' A) one ' B) two ' C) three ' D) four ' E) five N blologlcal cell membrane is a semipermeable barrier that separates the internal contents of the cell from the external environment. The cell membrane is exible. The components can move past each other. This allows the cell to move and respond to its environment. Choose the best description of how the cell membrane flexibility changes depending on the structure of the phOSpholipids and the presence of cholesterol. The exibility decreases with k A) longer tails, more saturated tails, and more cholesterol B) shorter tails, more saturated tails, and more cholesterol C) shorter tails, more unsaturated tails, and more cholesterol - D) shorter tails, more unsaturated tails, and less cholesterol E) longer tails, more saturated tails, and less cholesterol Which of the following fatty acids will have the lowest melting point? A) 020:4 B) 018:3 C) C18:2 D) 018:1 E) 018:0