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AQA AS and Year 1 A Level Biology - ALL past exam questions and answers £11.99   Add to cart
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AQA AS and Year 1 A Level Biology - ALL past exam questions and answers

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The COMPLETE guide to A Level Biology: This is ALL of the past AQA exam questions for the new-spec AQA Biology A-Level and created a handy spreadsheet with ALL answers to every single past paper question. This is over 80 page document, neatly broken down by topic which covers every aspect of the AS...

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  • June 20, 2018
  • 42
  • 2017/2018
  • Study guide

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Question Marks Answer


Feature of starch as storage 2 Helical, compact
Insoluble, doesn't affect Ψ


Cellulose structure 4 Long + straight chains, β glucose
Linked with H-bonds
Form microfibrils
Provides strength to cell wall


Polymer definition 1 Molecule made of identical monomers


Biuret Test 2 Add NaOH
Add CuSO4
Goes purple


Reducing sugar in chewing 2 Maltose
Salivary amylase hydrolyses starch


Found in prokary not eukary 2 Plasmid
Flagellum
Capsule
Small Ribosomes


Test for lipids 4 Crush
Add ethanol
Water
Milky white emulsion


Adv of % comparison 2 Amount varies between individual
Allows comparison

,Evaluate Qs 4 Control group?
Could be due to other factors
Small sample size
Only 1 investigation, not representative


Primary-Quaternary Structure 4 Primary: DNA base sequence coding for amino acids
Secondary: folding of chain, H-bonds. Coiled α, β pleat
Tertiary: 3D folding, H-bonds/ionic/disulfide if cysteine
Quart: Association of another polypeptide chain


Non-competitive inhibitor 2 Inhibitor attaches to enzyme away from AS
Change shape of AS, prevent E-S complex


Investigate optimum temp of enzyme 3 Way to maintain range of temps - water baths
Measure rate of activity - time taken for indicator change
Other conditions constant, eg volumes, pH, do repeats


Temp on enzyme activity 3 Increases KE
Increases collisions/formation of E-S complexes
Increases rate of breakdown of starch


pH on enzyme activity 3 Increases H+ ions
H-bonds/ionic disrupted/change tertiary structure
Change shape of active site, no E-S complex fit


What is 'death by osmosis'? 2 Water enters via osmosis, which increases pressure
Cell wall not strong enough, cannot withstand pressure


Tertiary Structure 2 Folding of polypeptide chain
Folding of secondary structure

, How does denaturation occur 2 More KE
Bonds holding tertiary structure break


Competitive Inhibition 6 Sequence of amino acids gives shape
Tertiary structure
Similar shape to substrate
Competes for active site


Non-competitive inhibition 3 Fits at site other than active site
Distorts active site
Substrate will not fit


Digestive enzyme in ileum lining 1 Dipeptidases


Percentage Decrease 1 (New-Old) / New x 100


Role of cholesterol 1 Makes membrane less fluid, maintains stability


Channel proteins vs carrier proteins 2 Channel: charged particles through membrane via fac diff
Carrier: protein changes shape, release molecules on opp


Enzyme definition 1 Protein, catalyst, lowers activation energy


Change in pH means 3 Enzymes in blood affected by change in pH
Changes tertiary structure
Less O2 binds with haemoglobin


Monomer definition 1 Basic molecular unit combines to form polymer


2 examples of monomers 2 Amino acids, nucleotides, monosaccharides

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