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Bio 181 Exam 1- Questions & Answers
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Bio 181 Exam 1- Questions & Answers
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Bio 181 Exam 1- Questions & AnswersFacilitated diffusion Correct Ans-pathway provided by transport proteins that helps certain
molecules pass through a membrane
Fatty acid Correct Ans-an organic acid that is contained in lipids, such as fats or oils
Fluid mosaic model Correct Ans-The currently accepted model of cell membrane structure,
which envisions the membrane as a mosaic of individually inserted protein molecules drifting
laterally in a fluid bilayer of phospholipids.
Gap junctions Correct Ans-Points that provide cytoplasmic channels from one cell to another
with special membrane proteins. Also called communicating junctions.
Glucose transporter Correct Ans-molecule that spans external membrane of cell and
transports glucose molecules from outside the cell to inside for use
Glycerol Correct Ans-Combines with fatty acids to make lipids
Glycolipid Correct Ans-A lipid covalently attached to a carbohydrate.
Glycoprotein Correct Ans-A protein covalently attached to a carbohydrate.
Hydrophilic Correct Ans-attracted to water molecules
Hydrophobic Correct Ans-avoids water molecules
Hypertonic Correct Ans-more concentrated
, Hypotonic Correct Ans-less concentrated
Integral membrane protein Correct Ans-A protein embedded in the lipid bilayer of a cell.
These are typicallly cell surface receptors, channels, or pumps.
Isotonic Correct Ans-same concentration
Lipophilic Correct Ans-attracted to lipids
Lipophobic Correct Ans-avoids lipids
Osmosis Correct Ans-The diffusion of water across a selectively permeable membrane.
Passive membrane transport Correct Ans-No energy is required, moves from higher to lower
concentrations, and goes down the concentration gradient
Peripheral membrane protein Correct Ans-A membrane protein found only on the surface of
the membrane.
Permeable membrane Correct Ans-A membrane that is capable of being passed through by
everything
Phagocytosis Correct Ans-the process by which a cell engulfs large particles or whole cells,
either as a defense mechanism or as a means to obtain food.
Phospholipid bilayer Correct Ans-a double layer of phospholipids that makes up plasma and
organelle membranes
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