AQA A Level Biology Unit 1 questions and answers 100% verified

x
x
x
x
x
x
x
x
x
x




AQA A Level Biology Unit 1 questions and
x x x x x x x




answers 100% verified.
x x x x

x
x
x
x
x
x
x

How xdo xbiological xmolecules xprovide xevidence xfor xevolution? x- x xcorrect xanswer. x x
xThey xall xhave xsimilar xmolecules xand xuse xthe xsame xamino xacids xand xDNA. x
x

What xare xmonomers xof xcarbohydrates xcalled? x- x xcorrect xanswer. x x
xMonosaccharides. x
x

Beta xGlucose x- x xcorrect xanswer. x x x x
x

Alpha xglucose x- x xcorrect xanswer. x x x x
x

Glucose xformula x- x xcorrect xanswer. x x xC₆H₁₂O₆ x
x

Name xof xthe xbond xbetween xmonosaccharides? x- x xcorrect xanswer. x x xGlycosidic xbond.
x
x

What xis xsucrose xmade xfrom? x- x xcorrect xanswer. x x xGlucose xand xfructose. x
x

What xis xlactose xmade xfrom? x- x xcorrect xanswer. x x xGlucose xand xgalactose. x
x

What xis xmaltose xmade xfrom? x- x xcorrect xanswer. x x xTwo xalpha xglucose. x
x

Testing xfor xreducing xsugars? x- x xcorrect xanswer. x x xAdd xBenedict's xreagent x(blue) xand
xheat xin xa xwater xbath xat xa xboil. xIf xpresent: xGreen x→ xyellow x→ xorange x→ xbrick xred x
x

Test xfor xnon-reducing xsugars? x- x xcorrect xanswer. x x xAdd xdilute xhydrochloric xacid xand
xheat, xneutralise xwith xSodium xHydrogencarbonate xand xadd xBenedicts xreagent. x
x

What xis xthe xscientific xname xfor xcarbohydrates? x- x xcorrect xanswer. x x
xPolysaccharides. x
x

What xis xstarch xmade xof? x- x xcorrect xanswer. x x xStarch xis xa xmixture xof xtwo
xpolysaccharides xof xalpha xglucose: xAmylose xand xamylopectin. x
x

What xis xamylose? x- x xcorrect xanswer. x x xA xlong, xunbranched xalpha xglucose xchain.
xThe xangles xin xit xmake xit xhave xa xcoiled xshape xwhich xmakes xit xcompact xand

xeffective xfor xstorage. x
x

, What xis xamylopectin? x- x xcorrect xanswer. x x xA xlong, xbraqnched xalpha xglucose xchain.
xThe xside xbranches xmean xthat xenzymes xcan xget xto xand xhydrolise xglycosidic xbonds

xfaster xso xglucose xcan xbe xreleased xquickly. x
x

What xis xglycogen? x- x xcorrect xanswer. x x xA xpolysaccharide xof xalpha xglucose xwith xa
xsimilar xstructure xto xstarch xexcept xit xis xmore xbranched, xallowing xeven xfaster xenergy

xrelease. xIt xis xalso xvery xcompact. x
x

What xis xcelluose? x- x xcorrect xanswer. x x xit xis xmade xof xlong. xstraight xchains xof xbeta
xglucose. xThe xchains xare xlinked xmy xhydrogen xbonds xto xform xmicrofibrils, xa xstrong

xfibre. xThe xstrong xfibres xallow xit xto xprovide xstructural xsupport xin xcells xas xcell xwalls. x
x

How xto xtest xfor xstarch. x- x xcorrect xanswer. x x xAdd xiodine xwhich xis xdissolved xin
xpotassium xiodie xti xthe xsample. xPositive xresult: xTurns xblue-black. xNegative xresult:

xstays xbrownyorange. x
x

Which xof xproteins, xpolysaccharides xand xlipids xare xnot xa xpolymer. x- x xcorrect xanswer. x
x xLipids. x
x

What xare xtriglycerides xmade xof? x- x xcorrect xanswer. x x xGlycerol xand xfatty xacids. x
x

What xcauses xlipids xto xbe xinsoluble xin xwater? x- x xcorrect xanswer. x x xThe xhydrophobic
xfatty xacid xtails. x
x

What xis xthe xstructure xof xa xfatty xacid? x- x xcorrect xanswer. x x x x
x

What xdo xdouble xbonds xcause xin xfatty xacids? x- x xcorrect xanswer. x x xA xkink xin xthe
xchain. x
x

Triglyceride xformation? x- x xcorrect xanswer. x x x x
x

What xare xphospholipids? x- x xcorrect xanswer. x x xSimilar xto xtriglycerides, xbut xone xof xthe
xfatty xacid xtails xis xreplaced xby xa xphosphate xgroup xhead. x
x

Which xpart xof xa xphospholipid xis xhydrophillic xand xwhich xpart xis xhydrophobic? x- x
xcorrect xanswer. x x xThe xphosphate xgroup xis xhydrophillic xand xthe xfatty xacid xtail xis

xhydrophobic. x
x

What xare xtriglycerides xmainly xused xfor? x- x xcorrect xanswer. x x xTo xstore xenergy, xthey
xare xeffective xat xthis xas xthe xhydrocarbon xtails xcontain xa xlot xof xenergy. xThey xare xalso

xinsoluble xso xdo xnot xaffect xthe xwater xpotential xof xcells, xpreventing xswelling. x
x

How xmuch xenergy xdo xlipids xcontain xcompared xto xcarbohydrates? x- x xcorrect xanswer. x
x xTwice xas xmuch xenergy xper xgram. x
x

Why xdo xtriglycerides xbundle xtogether xin xwater? x- x xcorrect xanswer. x x xThe xfatty xacid
xtails xare xhydrophobic xso xface xinwards, xso xare xshielded xby xthe xglycerol xheads. x
x

What xrole xdo xphospholipids xperform? x- x xcorrect xanswer. x x xThey xmake xup xthe xbilayer
xin xcell xmembranes. x
x

Test xfor xlipids? x- x xcorrect xanswer. x x xThe xemulsion xtest: xShake xsubstance xwith
xethanol xand xpour xinto xwater. xA xwhite xemulsion xforms xif xit xis xpresent. x