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Brooker Biology Ch. 5 Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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Brooker Biology Ch. 5 Exam Questions and Answers 2024( A+ GRADED 100% VERIFIED).
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Brooker Biology ch. 5Plasma membrane - ANS Separates the internal contents of a cell from its external
environment.
Phospholipids bilayer - ANS Framework of the membrane. Consists of 2 phospholipids
3 components of the plasma membrane - ANS Lipids, proteins, and carbohydrates
Amphipathic - ANS Molecules with a hydrophobic and hydrophilic region
Fluid-mosaic model - ANS Membrane structure illustrated to show the properties that resemble
the fluidity of a membrane because of the movement of the proteins and lipids.
Leaflet - ANS Half of a phospholipid bilayer.
3 ways membrane proteins associate with membranes - ANS 1. Integral membrane protein:
transmembrane proteins
2. Integral membrane protein: lipid-anchored proteins
3. Peripheral membrane proteins
Integral membrane proteins - ANS Cannot be released from the membrane unless the
membrane is dissolved with solvent or detergent. Transmembrane proteins and lipid-anchored
proteins
Transmembrane proteins - ANS One or more regions physically inserted into the hydrophobic
interior of phospholipids bilayer.
Lipid-anchored proteins - ANS Proteins with a lipid molecule that is covalently attached to an
amino acid side chain within the protein.
Peripheral membrane proteins - ANS Proteins that are non covalently bound to regions of
integral membrane proteins that project out from the membrane. Or they are bound to the polar
head groups of the phospholipids.
Fluidity - ANS Individual molecules remain in close association yet have the ability to readily
move within the membrane.
Semifluid - ANS Molecules are able to move two- dimensionally: rotate around long axes and
move laterally within the membrane leaflet.
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