Summary notes on the whole of A2 Biology CIE questions
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Course
Unit 4 - D Cell Membranes and Transport
Institution
CIE
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Gene therapy eg for CF (cystic fibrosis)
MOLECULAR BIOLOGY - CF caused by mutation
Plasmids suitable - Of CFTR gene
- Small ∴ easily taken up - ∴ prot defective
- Circular - ∴ insert normal, dominant allele
- Markers- easy identify - → DNA
- Easy manipulate - Cells of resp. System
- Cut sp location by rest. Endonuc. - Vector = virus
- Take as spray
Synthesis human insulin by bacteria - Liposomes
1. Isolate mRNA coding for insulin - Harmless virus
2. From B cells pancreas - Unpleasant side effects
3. Reverse transcriptase enz - Short lived effects
4. → cDNA single strand Gel electrophoresis in gen fingerprint
5. DNA p. → double strand 1. Identify DNA + ↑ quantity w PCR
6. Restriction endonuclease (r.end) 2. Cut DNA frags by restriction endo.
7. Sticky ends created 3. Close to VNTR seq
8. Plasmid vector 4. Loaded → wells agarose gel
9. R.end cut plasmid (w micropipette)
10. DNA ligase join DNA 5. Add buffer solution
11. Vector → into host cell 6. Apply direct current
12. Identify modified bact w markers 7. DNA=negative due phosphate group
13. Clone + grow fermenter 8. ∴ DNA attracted anode
9. Short fragments move further
+ves genetic screening 10. Southern blotting
- Provide info abt ↑ed risk have gen 11. Heat to sep strands
cond 12. Fluorescent dye to identify
- Allow prepare late onset conditions 13. UV light
eg huntington 14. Banding pattern
- Allow parents prepare financially Pcr process
- Identify carriers 1. Amplification of DNA
- Help prov early diagnosis 2. = Rapid
- Allow couples both carriers make 3. Only need small sample DNA
decision abt start family 4. DNA denat. 95°
Role genetic counsellor 5. Add DNA primer
- Carriers gen disease 6. Anneal @ 65°
- Gen screening 7. Comp b.p
- Eg amniocentesis 8. Taq p. = ↑ opt t
- Explain test results 9. Rep strand @ 72°
- Discuss Termination 10. Repeat process
- Financial implications 11. Taq doesn’t need replace each cycle
∴ efficient process
,PROK - LAC OPERON
E.g Gibberellin
Operon : length DNA more than 1 struct - T.F = PIF bind promotor reg
gene + control reg DNA (dormant seed)
- ∴ rna p ca bind → initiate transcrp
3 struct genes : - DELLA prot = inhibitor bound PIF
- Lac Z - code B-galactosidase - ∴ x bind gene promote , stop prod
- Lac Y - code permease mrna
- Lac A - code transacetylase - Gibberellin stim breakdown DELLA
prot
When NO lactose present (gene → active) - TF bind target promote : ↑ mrna
- Regulatory gene code for repressor transc amylase gene, ↑ amylase
protein synthesis gene
- Repressor bind operator
- Presence repressor protein , MICROARRAYS
RNA p CAN’T bind to promotor
- NO transcription of 3 struct genes 1. Identify, + compare genes present in
2 species
Lactose present: - DNA collected, cut → frag +
(act as inducer) denatured → s.s (oligo) DNA
- Lactose taken up by bact - DNA labelled fluorescent tags
- Lactose bind allosteric ∴ prev bind - Mix samples allow hybridize comp w
operator probe on microarray
- Transcription x longer inhibited - Any DNA x bind = washed off
- ∴ mRNA transrived - UV identify tags
- Genes translated → synth enz - Scan + store data
EUK - TRANSCRIPTION FACTORS 2. Identify gene expression
(bind rna p, bind t.f, bind sp dna seq) - Isolate collect mRNA from 2 cell
types
E.g OESTROGEN (animals) - Reverse transcriptase ∴ mRNA →
- Diff across c.memb → cytoplasm s.s. cDNA
- Comb w site transcriptional factor - cDNA labelled w fluores.tags +
(already have inhibitor mol) denatured → s.s dna
- T.f >1 site ∴ bind oestrogen - DNA hybridize w probes
- Change shape ∴ release inhib. - Fluoresce = genes being transcribed
- Expose DNA bind site, t.f bind - Intensity → activity gene
- → activate transcription
, - Lipids >H atoms ∴ NADH → ETC
- Using red. NAD
- Prod ATP
Energy and respiration
ATP - phosphorlated nuc.
- Small+h20 sol ∴ easily transp within
cell Why lipids > E rich
- Reversible ADP + Pi → ATP - > H per mol
- Immediate E donor (from chemiosm) - > E val per unit mass 39.4
- Act. transp eg Na-K pump - >h = >NADH = > ATP
- Prot synth - > ox.phosph
- Transfers E in all cells - Fats ONLY aerobically
- High turnover - > H20 prod a >h red o2→ h20
- Small packets E
Rice adaptations
Need E living organisms (9) - Plant hormone ethene = stimulates
- ATP universal E currency prod gibberellin
- Light E p/s - Gib. stimulates ↑ cell length
- E req anabolic rxn - Leaves (p/synth) + flowers
- Prot synth, Ea (sex.reproduction) above h20
- Activate glucose glycolysis - Aerenchyma stem + roots → assist
- Na-K a.transport gas diff o2 → roots (within plant)
- Movement eg muscle contr. - Air trapped underwater leaves
- Exocyt - Roots shallow + submerged →
- t regulation anaerobic
- Prod ethanol
Role ATP a.transp + named anabolic - Tolerates high [ethanol]
- ATP proides E - > ethanol dehydrogenase
- AT against conc grad
- Carrier protein Role NAD aerobic respirstion
- Bind specific ion - = Coenzyme
- Change 3° shape protein - For dehydrogenase
- Anabolic complex synthesised from - Gets reduced + carries H
simple molecules - From glycolysis + Krebs → ETC
- Eg Starch from monosaccharides - - Reoxidised + regenerates ∴
glycosidic bonds (NADH→ NAD)
- Polypeptides from amino acids - Produces 3 ATP for each reduced
(a.a)→ peptide bonds NAD
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