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Membranes

Midterm 2 Biochemistry

Membranes are based off of ______ and _______ bilayers. phospholipid, sphingolipid
T or F: Proteins also contain protein and cholesterol. True
T or F: A lower percentage of unsaturated fatty acids makes the membrane more stiff. False
T or F: Cholesterol present in the membrane gives more fluidity. True
______ and ______ make up lipid rafts. Cholesterol, sphingolipids
What are the three types of membrane proteins? Integral, peripheral, lipid-anchored
_____ membrane proteins completely span the bilayer. Integral
_____ membrane proteins are only on one face of the membrane. Peripheral
T or F: Peripheral membrane proteins are hydrophilic. True
T or F: Lipid-anchored proteins violate the hydrophobic in, hydrophilic out rule. True
Lipid anchored proteins are connected by ____ bonds. amide or ester
T or F: Charged molecules pass freely through the membrane. False
T or F: Pass transport does not require a protein carrier. False
Pores are ____ selective while channels are ____ selective. weakly, highly
What are two types of switches for gated channels? Electrical potential or ligand
T or F: Facilitated transport proteins can be inhbited. True
_____ active transport requires a form of energy. Primary
_____ active transport involved the active transport of one molecule coupled to the passive transport of another molecule. Secondary
Endocytosis Bringing molecules from the outside in.
Exocytosis Sending molecules from the inside out.
In endocytosis, the vescicle fuses with the ______ and ______. endosome, lysozome
Extracellular signals are considered to be _____. first messengers
Small molecules on the inside of cells are considered to be ______. second messengers
Transmembrane proteins activate ____ when a signal comes through. G-proteins
G-proteins are activated by ______. GTP
_____ is the only sensory stimuli without receptors which work via transmembrane proteins. Hearing
cAMP and cGMP are examples of _____. second messengers
Created by: goberoi