Modulel 5:l BIODl 101/l BIOD101l (Latestl
2025/l 2026l Update)l Essentiall Biologyl Il
W/Labl |l Questionsl &l Answers|l Gradel A|l
100%l Correctl (Verifiedl Solutions)-l
Portagel Learning
Q:l Whatl arel thel 3l typesl ofl celll surfacel receptorsl discussedl inl thel
module?
Answer:
Gl protein-coupledl receptorsl (GPCRs),l receptorl tyrosinel kinasesl (RTKs),l andl
ligand-gatedl ionl channels
Q:l Whatl nucleotidel doesl al Gl proteinl bindl to?l Whatl isl thel broadl rolel ofl
alll Gl proteins?
Answer:
Al Gl proteinl functionsl byl bindingl tol thel nucleotidel guanosinel triphosphatel
(GTP).l Whilel therel arel manyl differentl typesl ofl Gl proteins,l theyl alll sharel
thel broadl rolel ofl hydrolyzingl (breakingl down)l GTPl tol GDPl (guanosinel
diphosphate)
Q:l Whatl typel ofl enzymel isl anl RTK,l andl whatl isl thel broadl functionl ofl
thatl enzyme?
, Answer:
RTKl isl al kinase.l Al kinasel isl anl enzymel thatl transfersl phosphatel groupsl
tol al proteinl orl anotherl targetl moleculel froml anl ATPl molecule.
Q:l Describel whatl happensl whenl al ligandl bindsl tol thel extracellularl
bindingl sitel ofl al ligand-gatedl ionl channel.
Answer:
Al conformationall changel occurs,l whichl elicitsl thel channell tol openl andl
allowl thel passagel ofl ionsl suchl asl calciuml orl chloride.
Q:l Truel orl False:l Malel andl femalel sexl hormonesl arel small,l hydrophilicl
moleculesl thatl passl throughl thel hydrophilicl regionsl ofl thel plasmal
membranel tol reachl theirl targetl receptors.
Answer:
False,l Malel andl femalel sexl hormonesl arel small,l hydrophobicl moleculesl
thatl passl throughl thel hydrophobicl regionsl ofl thel plasmal membranel tol
reachl theirl targetl receptors.
Q:l Ifl al ligandl bindsl tol al receptorl andl causesl al responsel inl thel targetl
cell,l wel referl tol thatl ligandl asl anl ________;l Ifl al ligandl bindsl tol al targetl
celll receptorl andl blocksl thel appropriatel ligandl froml binding,l itl isl referredl
tol asl anl ________.
2025/l 2026l Update)l Essentiall Biologyl Il
W/Labl |l Questionsl &l Answers|l Gradel A|l
100%l Correctl (Verifiedl Solutions)-l
Portagel Learning
Q:l Whatl arel thel 3l typesl ofl celll surfacel receptorsl discussedl inl thel
module?
Answer:
Gl protein-coupledl receptorsl (GPCRs),l receptorl tyrosinel kinasesl (RTKs),l andl
ligand-gatedl ionl channels
Q:l Whatl nucleotidel doesl al Gl proteinl bindl to?l Whatl isl thel broadl rolel ofl
alll Gl proteins?
Answer:
Al Gl proteinl functionsl byl bindingl tol thel nucleotidel guanosinel triphosphatel
(GTP).l Whilel therel arel manyl differentl typesl ofl Gl proteins,l theyl alll sharel
thel broadl rolel ofl hydrolyzingl (breakingl down)l GTPl tol GDPl (guanosinel
diphosphate)
Q:l Whatl typel ofl enzymel isl anl RTK,l andl whatl isl thel broadl functionl ofl
thatl enzyme?
, Answer:
RTKl isl al kinase.l Al kinasel isl anl enzymel thatl transfersl phosphatel groupsl
tol al proteinl orl anotherl targetl moleculel froml anl ATPl molecule.
Q:l Describel whatl happensl whenl al ligandl bindsl tol thel extracellularl
bindingl sitel ofl al ligand-gatedl ionl channel.
Answer:
Al conformationall changel occurs,l whichl elicitsl thel channell tol openl andl
allowl thel passagel ofl ionsl suchl asl calciuml orl chloride.
Q:l Truel orl False:l Malel andl femalel sexl hormonesl arel small,l hydrophilicl
moleculesl thatl passl throughl thel hydrophilicl regionsl ofl thel plasmal
membranel tol reachl theirl targetl receptors.
Answer:
False,l Malel andl femalel sexl hormonesl arel small,l hydrophobicl moleculesl
thatl passl throughl thel hydrophobicl regionsl ofl thel plasmal membranel tol
reachl theirl targetl receptors.
Q:l Ifl al ligandl bindsl tol al receptorl andl causesl al responsel inl thel targetl
cell,l wel referl tol thatl ligandl asl anl ________;l Ifl al ligandl bindsl tol al targetl
celll receptorl andl blocksl thel appropriatel ligandl froml binding,l itl isl referredl
tol asl anl ________.
