Chaoter 7: Membrane Flashcards
What part of a phospholipd is polar? Which one is nonpolar?
The head is polar, the tails are nonpolar
What does cholesterol do in the cell membrane?
Stabilize cells in hot weather
What are the teo major classes of proteins?
Integral and peripheral
Which protiens are transmembrane and amphipathic?
Integral
What is a peripheral protein?
1 of 2 major classes of membrane proteins,
They sit on the surface
What do amphipathic mean?
Protein has ares that are charged (love water)and uncharged (hate water)
Integral membranes are…
Amphipathic
Why are glycoproteins important?
They important for immune response, cell to cell recognition
What areas in the body are guarded because of immune response?
The eye and the uterus
All cell membranes are the same. T or F
False, they are all different depending on their function
What happens on the cell membrane in HIV?
The HIV virus is based on RNA
HIV binds to CD4 (glycoprotein on white T blood cells)
What causes cystic fibrosis?
A Cl anionic channel defect
Hypotonic
Less particles, more water
HYPO, MORE H20
More h20 on the outside
Hypertonic
More particles, LESS H20
What happens to cells in a hypotonic solution
They gain water and lyse
What happens to cells im a hypertonic solution?
They lose water, shriveled(crenate)
What is facilitated diffusion?
What is active transport
Transport that requires energy because it moves against the concentration gradient
Facilitated diffusion requires energy
False
Facilitated transport uses
Diffusion
What does tertrodotoxin do?
It paralyzes sodium potassium pumps
ONE substance in ONE direction
Uniport
Symport
TWO substances in the SAME direction
Antiport
TWO substances in OPPOSITE directions, examples sodium potassium pump
