BIOLOGY 110 TEST 2 JOSEPH
RICHARDS QUESTIONS WITH
VERIFIED ANSWERS
The framework of the membrane is the - ANSWERSphospholipid bilayer
Phospholipids are ___ molecules - ANSWERSamphipathic
Polar, hydrophilic (water-loving) region faces - ANSWERSout
Non-polar, hydrophobic (water-fearing) region faces - ANSWERSin
Membrane is considered a mosaic of ____ molecules - ANSWERSlipid, protein, and
carbohydrate
Membrane resembles a fluid because lipids and proteins (can - ANSWERScannot)
move relative to each other within the membrane/ can
Region(s) are physically embedded in the hydrophobic portion of the phospholipid
bilayer - ANSWERSTransmembrane proteins
An amino acid of the protein is covalently attached to a lipid - ANSWERSLipid-anchored
proteins
Noncovalently bound either to integral membrane proteins that project out from the
membrane, or to polar head groups of phospholipids - ANSWERSperipheral membrane
proteins
20 to 30% of all genes estimated to encode___ - ANSWERStransmembrane proteins
This trend is found throughout all domains of life including - ANSWERSarchaea,
bacteria, and eukaryotes
Computer programs can be used to predict the number of transmembrane proteins in
an organism based on - ANSWERSDNA sequence data
____is a lung disease caused by a problem with transmembrane proteins in
membranes. - ANSWERSCystic fibrosis
___are semifluid - ANSWERSmembranes
, ____controls fluidity in membranes - ANSWERSCholesterol
At higher temperatures it ___membrane - ANSWERSstiffens
At lower temperatures it makes it more ____ and prevents ___ - ANSWERSfluid,
freezing
Most lipids can rotate ___ around their long axes and move laterally within the
membrane ___ - ANSWERSfreely,leaflet
But "flip-flop" of ____from one leaflet to the opposite leaflet does not occur
spontaneously - ANSWERSlipids
___requires ATP to transport lipids between leaflets - ANSWERSFlippase
Flippase requires ATP to transport ___between ___ - ANSWERSlipids,leaflets
provides energy for cell functions. - ANSWERSATP
ATP stands for - ANSWERSadenosine triphosphate
ADPstands for - ANSWERSadenosine diphosphate
___provides energy when the 3rd phosphate (Pi) group breaks off, at which point the
molecule converts to___. - ANSWERSATP,ADP
Certain lipids associate strongly with each other to form - ANSWERSlipid rafts
A group of lipids that floats together as a unit within the larger sea of lipids in the
membrane is known as a what - ANSWERSLipid raft
Composition of ___ is different than rest of membrane - ANSWERSlipid raft
The lipid raft has a higher concentration of - ANSWERScholesterol
The lipid raft has a unique set of - ANSWERSmembrane proteins
Shorter fatty acid tails are (MORE OR LESS) likely to interact, which makes the
membrane more fluid - ANSWERSless
creates a kink in the fatty acid tail, making it more difficult for neighboring tails to interact
and making the bilayer more fluid - ANSWERS
Presence of cholesterol - ANSWERSDouble bond
tends to stabilize membranes - ANSWERSCholesterol
RICHARDS QUESTIONS WITH
VERIFIED ANSWERS
The framework of the membrane is the - ANSWERSphospholipid bilayer
Phospholipids are ___ molecules - ANSWERSamphipathic
Polar, hydrophilic (water-loving) region faces - ANSWERSout
Non-polar, hydrophobic (water-fearing) region faces - ANSWERSin
Membrane is considered a mosaic of ____ molecules - ANSWERSlipid, protein, and
carbohydrate
Membrane resembles a fluid because lipids and proteins (can - ANSWERScannot)
move relative to each other within the membrane/ can
Region(s) are physically embedded in the hydrophobic portion of the phospholipid
bilayer - ANSWERSTransmembrane proteins
An amino acid of the protein is covalently attached to a lipid - ANSWERSLipid-anchored
proteins
Noncovalently bound either to integral membrane proteins that project out from the
membrane, or to polar head groups of phospholipids - ANSWERSperipheral membrane
proteins
20 to 30% of all genes estimated to encode___ - ANSWERStransmembrane proteins
This trend is found throughout all domains of life including - ANSWERSarchaea,
bacteria, and eukaryotes
Computer programs can be used to predict the number of transmembrane proteins in
an organism based on - ANSWERSDNA sequence data
____is a lung disease caused by a problem with transmembrane proteins in
membranes. - ANSWERSCystic fibrosis
___are semifluid - ANSWERSmembranes
, ____controls fluidity in membranes - ANSWERSCholesterol
At higher temperatures it ___membrane - ANSWERSstiffens
At lower temperatures it makes it more ____ and prevents ___ - ANSWERSfluid,
freezing
Most lipids can rotate ___ around their long axes and move laterally within the
membrane ___ - ANSWERSfreely,leaflet
But "flip-flop" of ____from one leaflet to the opposite leaflet does not occur
spontaneously - ANSWERSlipids
___requires ATP to transport lipids between leaflets - ANSWERSFlippase
Flippase requires ATP to transport ___between ___ - ANSWERSlipids,leaflets
provides energy for cell functions. - ANSWERSATP
ATP stands for - ANSWERSadenosine triphosphate
ADPstands for - ANSWERSadenosine diphosphate
___provides energy when the 3rd phosphate (Pi) group breaks off, at which point the
molecule converts to___. - ANSWERSATP,ADP
Certain lipids associate strongly with each other to form - ANSWERSlipid rafts
A group of lipids that floats together as a unit within the larger sea of lipids in the
membrane is known as a what - ANSWERSLipid raft
Composition of ___ is different than rest of membrane - ANSWERSlipid raft
The lipid raft has a higher concentration of - ANSWERScholesterol
The lipid raft has a unique set of - ANSWERSmembrane proteins
Shorter fatty acid tails are (MORE OR LESS) likely to interact, which makes the
membrane more fluid - ANSWERSless
creates a kink in the fatty acid tail, making it more difficult for neighboring tails to interact
and making the bilayer more fluid - ANSWERS
Presence of cholesterol - ANSWERSDouble bond
tends to stabilize membranes - ANSWERSCholesterol
