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BIOL130 Study Guide - Final Guide: Lipid Bilayer, Signal Transduction, Tight Junction

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Niels C Bols
Study Guide

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Biology 130- Module 3- Practice Multiple Choice Questions
Plasma membranes:
a) Enclose entire cell
b) Have openings for osmosis
c) Allow nothing to enter
Membrane functions do not include:
a) Signal transduction
b) Energy transduction
c) DNA transduction
In a membrane proteins penetrate:
a) Part way into lipid bilayer
b) Cannot penetrate lipid bilayer
c) Into or through lipid bilayer
Phospholipids contain a ____ backbone, and are phosphoglycerides.
a) Glycerol
b) Glycoglycerol
c) GAGs
Serine is a phosphoglyceride which produces the:
a) Cell suicide signal
b) Cell drinking signal
c) Cell maturation signal
Sphingolipids contain:
a) Amino acid and long hydrocarbon chain
b) Amino acid and glucose molecules
c) Amino acid and protein
False about cholesterol:
a) 50% of animal plasma membranes
b) Helps control cell membrane fluidity
c) Can create cell membranes from nothing
Glycoproteins are present in:
a) Chitin and gags of ECM
b) Oligosaccharides
c) Glucose creation

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Which is not a class of membrane proteins:
a) Integral
b) Pretegral
c) Peripheral
Intergral proteins:
a) Pass through lipid bilayer
b) Cannot penetrate lipid bilayer
c) Are not a true protein
Membranes allow proteins to:
a) Be associated both covalently and non convalently
b) Only associated if they penetrate lipid bilayer
c) Associate only non covalently
The G-protein Ras is a:
a) Integral protein
b) Peripheral protein
c) Lipid-anchored protein
Basal plasma membrane is on the:
a) Bottom of cell away from surface
b) Side of the cell binding to neighbouring cells
c) Top of the cell, receptor to most outward signals
Which set of cell junctions are similar:
a) Adherens-tight
b) Gap-desmosomes
c) Adherens-desmosomes
Cadherins are a family of:
a) Proteins
b) Glycol-proteins
c) Lipids
On a TEM a tight junction appears as:
a) 5 layers
b) 4 layers
c) 3 layers
Netflux of movement across a membrane:
a) Is an equilibrium
b) Occurs when influx or efflux is greater than the other

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c) is the total of incoming and outgoing materials
An electrochemical gradient affects:
a) the size of the membrane
b) diffusion across membrane
c) only the movement of electric charges on the membrane
Which statement is false:
a) a cell that shrinks is hypotonic
b) a cell that expands is isotonic
c) a cell that remains the same is isotonic
Tonicity depends upon:
a) permeability of membrane
b) thickness of membrane
c) membranes structure
Active diffusion involves:
a) ATP
b) Protein carrier
c) Both a and b
Partition coefficient equation is (C=concentration):
a) C in oil/ C in water
b) C in water/ C in fat
c) C in oil/ C in fat
Ions of large polar molecues cannot diffuse through lipid bilayer:
a) True
b) False
Chemical gated channels state depends upon:
a) Charge of ions on either side
b) Chemicals the gate is made of
c) Binding of particular substance
Facilitated diffusion:
a) Changes direction substance would cross a membrane
b) Involves the binding to a membrane spanning protein
c) Allows anything to cross the membrane
Active transport
a) An example is sodium-potassium pump
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