BS 161 Exam 2 UPDATED ACTUAL Questions and
CORRECT Answers
Where are cellular Only on the cell surface (plasma membrane)
membranes in prokaryotic
cells?
Where are cellular Cell surface (plasma membrane) and internal
compartments in membranes (organelle membranes)
eukaryotic cells?
Refers to phospholipids with a polar and nonpolar
Amphipathic
region
Draw and label a lipid
bilayer and the types of
interactions present in an
aqueous solution
How and when do -Form in aqueous neutral pH environments
phospholipid bilayers -They spontaneously form (no energy input required)
form?
How does temperature -Higher temperatures increase membrane fluidity
influence membrane -Lower temperatures decrease membrane fluidity
fluidity?
-Shorter length of fatty acid tails means increased
How does the length of a
membrane fluidity
fatty acid tail influence
-Longer length of fatty acid tails means decreased
membrane fluidity?
membrane fluidity
, -Unsaturated fatty acid tails have increased
How does saturation of a
membrane fluidity
fatty acid tail influence
-Saturated fatty acid tails have decreased membrane
membrane fluidity?
fluidity
Why is maintaining If membranes become too stiff or fluid they no longer
membrane fluidity function as effective barriers
important
-House together molecules that relate to a specific
process
-Separate processes that oppose each other
Why are compartments
(synthesis and breakdown of molecules)
beneficial to cells?
-Internal membranes increase the space available for
processes that occur across a membrane (parts of
respiration and photosynthesis)
Identify the following for a -No (nucleoid region)
prokaryotic cell: -Cytosol
-Has a nucleus? -Cytosol
-Location of transcription -Smaller (1-2 micrometers)
-Location of translation -No membrane-enclosed organelles
-Approximate size
-Internal organization
Identify the following for a -Yes
eukaryotic cell: -Nucleus
-Has a nucleus? -Cytosol
-Location of transcription -Larger (10-100 micrometers)
-Location of translation -Has membrane-enclosed organelles
-Approximate size
-Internal organization
-An internal membrane system that connects several
What is the structures/organelles by membranes
endomembrane system? -Each structure is contiguous with the next via that
membrane
CORRECT Answers
Where are cellular Only on the cell surface (plasma membrane)
membranes in prokaryotic
cells?
Where are cellular Cell surface (plasma membrane) and internal
compartments in membranes (organelle membranes)
eukaryotic cells?
Refers to phospholipids with a polar and nonpolar
Amphipathic
region
Draw and label a lipid
bilayer and the types of
interactions present in an
aqueous solution
How and when do -Form in aqueous neutral pH environments
phospholipid bilayers -They spontaneously form (no energy input required)
form?
How does temperature -Higher temperatures increase membrane fluidity
influence membrane -Lower temperatures decrease membrane fluidity
fluidity?
-Shorter length of fatty acid tails means increased
How does the length of a
membrane fluidity
fatty acid tail influence
-Longer length of fatty acid tails means decreased
membrane fluidity?
membrane fluidity
, -Unsaturated fatty acid tails have increased
How does saturation of a
membrane fluidity
fatty acid tail influence
-Saturated fatty acid tails have decreased membrane
membrane fluidity?
fluidity
Why is maintaining If membranes become too stiff or fluid they no longer
membrane fluidity function as effective barriers
important
-House together molecules that relate to a specific
process
-Separate processes that oppose each other
Why are compartments
(synthesis and breakdown of molecules)
beneficial to cells?
-Internal membranes increase the space available for
processes that occur across a membrane (parts of
respiration and photosynthesis)
Identify the following for a -No (nucleoid region)
prokaryotic cell: -Cytosol
-Has a nucleus? -Cytosol
-Location of transcription -Smaller (1-2 micrometers)
-Location of translation -No membrane-enclosed organelles
-Approximate size
-Internal organization
Identify the following for a -Yes
eukaryotic cell: -Nucleus
-Has a nucleus? -Cytosol
-Location of transcription -Larger (10-100 micrometers)
-Location of translation -Has membrane-enclosed organelles
-Approximate size
-Internal organization
-An internal membrane system that connects several
What is the structures/organelles by membranes
endomembrane system? -Each structure is contiguous with the next via that
membrane
