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AQA A LEVEL BIOLOGY REVISION EXAM QUESTIONS AND ANSWERS LATEST UPDATE.AQA A LEVEL BIOLOGY REVISION EXAM QUESTIONS AND ANSWERS LATEST UPDATE.AQA A LEVEL BIOLOGY REVISION EXAM QUESTIONS AND ANSWERS LATEST UPDATE.AQA A LEVEL BIOLOGY REVISION EXAM QUESTIONS AND ANSWERS LATEST UPDATE.
Typology: Exercises
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2 / 21 hydrogen bonds join (polysaccharide) chains/molecules to each other / makes microfibrils / gives tensile strength;
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7 m/ m 21
8 m/ m 21 mantibodies.
10 m/ m 21 msurrounding mtis- msue: m 1.Permeable mcapillary mwall/membrane;2. mSingle mcell mthick/thin mwalls, mreduces
11 m/ m 21 diffusionmdistance;3.mFlattenedm(endothelial)mcells,mreducesmdiffusionmdistance;4.mFen- mestrations, mallows msome mlarger mmolecules mthrough;m5.mSmall mdiameter/ mnarrow, mgives ma mlarge msurface marea mto mvolume/ mshort mdiffusion mdistance;6. mNarrow mlumen, mreduces mflow mrate mgiving mmore mtime mfor mdiffusion;7.mRed mblood mcells min mcontact mwith mwall/ mpass min msingle mfile, mgives mshort mdiffusion mdistance m/ mmore mtime mfor mdiffusion;
13 m/ m 21 (So) mfast mdiffusion;8mVentilation m/ mcirculation;m 9 mMaintains ma mdiffusion m/ mconcentration mgradient;
14 m/ m 21 madvantage mof mthe mposition mof mthe mmouse mcurve.: m Both mcurves mdrawn mas msigmoidal mcurves mwith mthe mmouse mto mthe mright. m(at mthe mtissues mat mlow mpp moxygen) mthe mmouse mhaemoglobin mis mless msaturated mwith moxygen m/ mhas mreduced maffinity; moxyhaemoglobin
16 m/ m 21 m 1. mHelicase; m2. mBreaks mhydrogen mbonds; m3. mOnly mone mDNA mstrand macts mas mtemplate;
17 m/ m 21
19 m/ m 21 sex;4. mIndication mof m(sexual) mmaturity m/ mfertility m/ mreceptivity m/ mreadiness mto mmate;5. mFormation mof ma mpair mbond m/ mbond mbetween mtwo morganisms m(to mhave m/ mraise myoung).
20 m/ m 21