Flashcards in 1.3 Membrane Structure Deck (7)
Describe a phospholipid bilayer membrane.
In water amphipathic phospholipids form double layers with the hydrophilic heads in contact w water (outside and inside of cell) and hydrophobic tails away from water in centre of membrane. This arrangement makes the membrane v stable
What are three types of fatty acids?
Saturated (full of hydrogen), monounsaturated (missing one hydrogen creating a 'kink' - double bond C), polyunsaturated (missing more than one hydrogen creating multiple double bonds between C)
What does hydrophobic mean? What does hydrophilic mean?
Hydrophobic means afraid of water. Hydrophilic means attracted to water.
What is in a triglyceride fat?
Glycerol + three fatty acids
What are some parts of the fluid mosaic model (what to include when drawing phos. Bilayer)
Integral protein (embedded in membrane), ECF and cytoplasm, Peripheral protein (found on surface), glycoprotein (sugar on integral), protein channel, cholesterol
Describe the different models of the membrane over time
1920, bilayer (did not explain proteins), 1930, proposed layers of protein adjacent to bilayer, 1966, discover proteins occupy variety of space in membrane leaving phospholipid molecules free to move