Biology 107 - Topic 6: The Membrane

Flashcards created from Biology 107 lecture notes on membrane structure and function.

The fluid mosaic model describes how membranes are __.

fluid mosaics.

Phospholipids form a __ that faces H2O on both sides.

bilayer.

An increase in temperature leads to __ membrane fluidity.

increased.

Saturated fatty acids lead to __ membrane fluidity compared to unsaturated fatty acids.

decreased.

Cholesterol regulates fluidity in __ membranes.

cell.

Integral membrane proteins interact with __ regions of the lipid bilayer.

hydrophobic.

The two types of proteins involved in facilitated diffusion are proteins and proteins.

channel; carrier.

In osmosis, water moves from to concentration of solutes.

lower; higher.

A solution with a higher solute concentration than the cell is considered __.

hypertonic.

Active transport moves substances __ their concentration gradient.

against.

The sodium-potassium pump transports Na+ out and K+ into the cell.

3; 2.

Endocytosis refers to the process where cells __ materials by forming new vesicles.

internalize.

In receptor-mediated endocytosis, cells use __ proteins to target specific molecules.

receptor.

Facilitated diffusion does not require __ to move substances.

energy.

Membrane potential is caused by a concentration gradient of __ across the membrane.

ions.

Bulk transport requires __ to carry material across the membrane.

vesicles.

Water will always move from a solution to a solution.

hypotonic; hypertonic.

The term __ refers to the membrane's ability to control what enters or exits the cell.

selective permeability.