a.v.a Posted May 18, 2010 Report Share Posted May 18, 2010 how was it guys ?Overall the papers were good. Paper one was pretty good most of it i think are correct. Paper 2 was kind of confusing, i still don't know whats the correct answer for 'how does impulse travel along the membrane' in TZ2. does anyone know ? Reply Link to post Share on other sites More sharing options...
narathiel Posted May 18, 2010 Report Share Posted May 18, 2010 Also TZ2Paper 1 wtf, there were two questions which are not part of SL syllabus- the leading strand one and the one with bi/tricuspid valve- pls persuade your teachers to also protest so it gets taken off the examthe multiple choice had a couple iffy ones.I think I got 26/30 if I am lucky.Paper 2how does impulse travel was an essay qs, was it not?I took qs 5 with the digestion and enzyme importance but was kind of stuck what to write about the lactose free milk- should i write about how to get lactase or how to use lactase to get rid of lactose in milk?- i wrote about bothonly qs i got wrong for sure is define allele- o well 1 point. for the labelling the gene transfer the first label for me was bacteria cell i also labelled sticky gc ends somewhere and the recombinant plasmidi dont remember anything too difficult for either papers but they were much harder than previous papers cos I am not sure if I got a 7, unlike last 3+ yrs lol...lots of chem was in my favour as i do chem HL. Reply Link to post Share on other sites More sharing options...
bobo Posted May 18, 2010 Report Share Posted May 18, 2010 (edited) how was it guys ?Overall the papers were good. Paper one was pretty good most of it i think are correct. Paper 2 was kind of confusing, i still don't know whats the correct answer for 'how does impulse travel along the membrane' in TZ2. does anyone know ?HiI did question 7 in section B which one of its parts was about that how does impulse travel along the neuron membrane go to http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120107/anim0013.swf::Voltage%20Gated%20Channels%20and%20the%20Action%20Potentialhere you will find an animation that summarises the whole process Edited May 18, 2010 by bobo Reply Link to post Share on other sites More sharing options...
javi Posted May 18, 2010 Report Share Posted May 18, 2010 TZ 1.Paper 1 was OK, rather easy I think. Paper 2 was also fine, I wrote two sheets (3.5 pages) about Miosis for the long questions. P3 can't be discussed yet...The only VERY weird thing was the question in P2 asking why the food industry uses lactase to break down lactose in many products, worth 3 points. Other than lactose intolerant people, and maybe better taste of glucose + galactose, I saw no third logical reason... Reply Link to post Share on other sites More sharing options...
narathiel Posted May 18, 2010 Report Share Posted May 18, 2010 i did the lactose qs and I wrotethat you can use lacase to immobilize lactose on beadsor just add it to milkand then about culturing bacteria to produce lactase. Reply Link to post Share on other sites More sharing options...
a.v.a Posted May 19, 2010 Author Report Share Posted May 19, 2010 Also TZ2Paper 1 wtf, there were two questions which are not part of SL syllabus- the leading strand one and the one with bi/tricuspid valve- pls persuade your teachers to also protest so it gets taken off the examthe multiple choice had a couple iffy ones.I think I got 26/30 if I am lucky.Paper 2how does impulse travel was an essay qs, was it not?I took qs 5 with the digestion and enzyme importance but was kind of stuck what to write about the lactose free milk- should i write about how to get lactase or how to use lactase to get rid of lactose in milk?- i wrote about bothonly qs i got wrong for sure is define allele- o well 1 point. for the labelling the gene transfer the first label for me was bacteria cell i also labelled sticky gc ends somewhere and the recombinant plasmidi dont remember anything too difficult for either papers but they were much harder than previous papers cos I am not sure if I got a 7, unlike last 3+ yrs lol...lots of chem was in my favour as i do chem HL.Yeah paper 1 was easy. those two are out of syllabus ? i will ask my teacher tomorrow. In paper 2 the labelling i did was :1)bacterium 2) plasmid3) desired gene 4) host cell ( i was confused and didnt know what to write)yeah i am also losing one point in the allele question i just wrote one set of genotype in the nerve impulse question i wrote about when the impulse reaches the end of pre synaptic neuron the calcium ions open and the neurotransmitter do chemical reaction in post synaptic neuron. Is it correct ? Reply Link to post Share on other sites More sharing options...
Latim Posted May 19, 2010 Report Share Posted May 19, 2010 Also TZ2Paper 1 wtf, there were two questions which are not part of SL syllabus- the leading strand one and the one with bi/tricuspid valve- pls persuade your teachers to also protest so it gets taken off the examthe multiple choice had a couple iffy ones.I think I got 26/30 if I am lucky.Paper 2how does impulse travel was an essay qs, was it not?I took qs 5 with the digestion and enzyme importance but was kind of stuck what to write about the lactose free milk- should i write about how to get lactase or how to use lactase to get rid of lactose in milk?- i wrote about bothonly qs i got wrong for sure is define allele- o well 1 point. for the labelling the gene transfer the first label for me was bacteria cell i also labelled sticky gc ends somewhere and the recombinant plasmidi dont remember anything too difficult for either papers but they were much harder than previous papers cos I am not sure if I got a 7, unlike last 3+ yrs lol...lots of chem was in my favour as i do chem HL.Yeah paper 1 was easy. those two are out of syllabus ? i will ask my teacher tomorrow. In paper 2 the labelling i did was :1)bacterium 2) plasmid3) desired gene 4) host cell ( i was confused and didnt know what to write)yeah i am also losing one point in the allele question i just wrote one set of genotype in the nerve impulse question i wrote about when the impulse reaches the end of pre synaptic neuron the calcium ions open and the neurotransmitter do chemical reaction in post synaptic neuron. Is it correct ?It's how the nerve impulse is passed along the membrane, so no not synaptic transmission but the depolarization and repolarization along the membrane and then mention how the NA+ ion channels open the eflux of K+ ions out of the neuron etc. Or so i think anyway. Reply Link to post Share on other sites More sharing options...
IBdem522 Posted May 19, 2010 Report Share Posted May 19, 2010 TZ 1.Paper 1 was OK, rather easy I think. Paper 2 was also fine, I wrote two sheets (3.5 pages) about Miosis for the long questions. P3 can't be discussed yet...The only VERY weird thing was the question in P2 asking why the food industry uses lactase to break down lactose in many products, worth 3 points. Other than lactose intolerant people, and maybe better taste of glucose + galactose, I saw no third logical reason...I agree with you here. The 3 of us at my school taking Sl bio agreed there was no logical 3rd or kind of even 2nd answer after the lactose free one. I thought it was a dumb question Reply Link to post Share on other sites More sharing options...
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