# nitroglycerina

Members

18

6 Recognised

• Gender
Female
• Exams
May 2014
• Country
Poland
1. ## Made a stupid mistake on Paper 2 TZ1. Will IB give me Error Carried Forward?

it depends - if the error made it easier for you to calculate the rest of question, they will not give you points, if it made it easier, they will. that's what our teacher told us
2. ## IA Math SL IA Help!

I think it is very risky because there are many other variables that you cannot control and it will be quite difficult to model the function Moreover, even if you will show some correlation, it will not show any causation and it makes stating any assumptions very vulnerable to any additional external factors. IMO, it is much better and easier to just describe some already explored topic and introduce it in a way that your peers would understand it.
3. ## May 2014 Math SL paper 1 TZ2

hi i did that at first, but i realised it wasnt an integer. so basically i dont think you need to. since you had s2 you know that u2 is s2 - u1 did you do that? and what did all of you write for the general expression? i just added the arithmetic sequence with u1=1 d=3 to the geometric one with u1=k r=2 or sth Safe to say, I messed up on that one, my brain wasn't functioning properly then (started with section B). Ah well, aiming for that 5. i wrote it the other way around because f''(-2) was negative? since f'(x) was decreasing so i had f(-2)<F'(6)<f(0) yeah I found d = 3 and k = 0 so u1 = 1 how did u guys know its arithmetic or geometric? apparently it was both. So you had to use both geometric and arithmetic sequences but you didn't have to find value of anything. In a) you had to basically ubtract S2-S1, then S3-S2 and then S4-S3 and i b) the general formula for any Un had to be given and it was -2+3n + 2^(n-1)*k, but there was nothing about the actual value of k or whether it is arithmetic or geometric sequ Yeah, same here. I am quite positive that we did not have to find the value of k. But I did not get the general formula you got! I didn't realize that it was both arithmetic and geometric. I am scared now, because i honestly thought i was going to ace this exam And in the part (a) of the vector question, was the speed of Ryan's airplane 6? I just took the magnitude of the direction vector. Also, was it just me, or the least to great function's answer was: f'(6)<f''(-2)<f(0)? Because i clearly remember that f''(-2) also had possible positive values (greater than 0) and also negative values, whereas f'(6) was only 0. I am so confused right now. Hahhahahhahaha ah that Un question and yeah I also got 6 , for the function one, I think the f"(-2) can only be negative since it concave down? I got the answer that f''(-2)<f'(6)<f(0), as at -2, there was maximum of the function so second derivative must be negative, at 6 there was min and so stationary point which for first derivative is always 0 and f(0) was intersection y-axis at ome value above 0 so it was positive
4. ## May 2014 Math SL paper 1 TZ2

hi i did that at first, but i realised it wasnt an integer. so basically i dont think you need to. since you had s2 you know that u2 is s2 - u1 did you do that? and what did all of you write for the general expression? i just added the arithmetic sequence with u1=1 d=3 to the geometric one with u1=k r=2 or sth Safe to say, I messed up on that one, my brain wasn't functioning properly then (started with section B). Ah well, aiming for that 5. i wrote it the other way around because f''(-2) was negative? since f'(x) was decreasing so i had f(-2)<F'(6)<f(0) yeah I found d = 3 and k = 0 so u1 = 1 how did u guys know its arithmetic or geometric? apparently it was both. So you had to use both geometric and arithmetic sequences but you didn't have to find value of anything. In a) you had to basically ubtract S2-S1, then S3-S2 and then S4-S3 and i b) the general formula for any Un had to be given and it was -2+3n + 2^(n-1)*k, but there was nothing about the actual value of k or whether it is arithmetic or geometric sequence;o
5. ## May 2014 Biology HL TZ2 paper 3

When metabolism is increased, there's higher concentration of CO2 and lactic acid in the blood, and consequently the pH of the blood decreases. Hemoglobin acts as buffer and absorbs H+ ions, which decreases hemoglobin's affinity for oxygen and the Bohr shift promotes the release of oxygen to the respiring tissue. Thus, the curve shifts to the right. I also drew the graph but I don't think it will be enough to get 6 points.I wrote about the whole CO2 concentration rise but I forgot to mention pH :/ but I drew the graph and talked about how the curve shifts to the right aswell! Hope that gets me some marks:/ I wrote how it normally behaves, how CO2 concentration is connected to changes in pH, about the oxygen affinity to hemoglobin, cooperative binding and I draw hemoglobin dissociation curve before and after Bohr shift
6. ## May 2014 Biology HL TZ2 Paper 1 and 2

They were diving for shoerter period of time, but the breaks between each dives also were shorter. The depth of each dive decreased as well as the difference between the temperature of the body and water (it could also be noticed that after going out on the surface, there was increase in the body temperature). It was because there was vasoconstriction of arterioles and possibly shivering as muscles generate heat there (but I'm not sure of the second one)
7. ## May 2014 Biology HL TZ2 Paper 1 and 2

oh yeah i wasnt sure about this one either, im not sure but i think i said hydrolyse ATP It said in active transport so I didn't chose diffuse through as this doesn't require ATP, therefore I chose the same as you but I wasn't sure either I also picked the anwer with ATP because I think it was the only one which made sense enoguh to be picked.. Others were either too general or did not refer to active transport but facilitate diffusion
8. ## May 2014 Biology HL TZ2 Paper 1 and 2

I think i did crossin the heterozygous with the white hahahaha, but I thought that the white is recessive anyway??? For metaphase, I think I answered 3, but can't rly rmb >< I think the answer was 50% because it was refering to test-cross
9. ## What day is your last IB exam and how do you intend to celebrate? ^_^

I am also ending on 20th with paper 3 on chemistry (btw, which options did you choose?) and I am going to play league of legends as much as possible and party
10. ## May 2014 Biology HL TZ2 Paper 1 and 2

I also chose that one, other answers didn't seem valid. Is it the one with 'somethintsomething axons of the neuron somethingsomething'?
11. ## May 2014 Biology HL TZ2 Paper 1 and 2

only the neuron between the brain and the muscle was damaged so I think you were right
12. ## May 2014 Biology HL TZ2 Paper 1 and 2

II know that some (quite big) part of my classmate chose endoplasmic reticulum (proteins for exocytosis) but some (including me) chose sarcoplasmic reticulum. While one of the best students in our class picked rough endoplasmic reticulum pointing that actin is a fibrous protein so i has mainly secondary sturcture and does not need any further modification so it will be just synthesised and then exocitosised. Anyway I'm confused with this question... I chose sarcoplasmic reticulum too cuz I think I read on ib.bioninja before that the muscle fibres have this layer called the sarcoplasmic reticulum instead of the endoplasmic reticulum I thought that sarcoplasmic reticulum mainly functions in storage of calcium ions but it's a good point though. I'm not 100% sure but I don't think the sacroplasmic reticulum carries out protein synthesis I agree. And also, isn't is possible for other cells than muscle cells to produce actin for use within the muscle? Because in that case, endoplasmic reticulum sounds reasonable Well, muscles cells are excpetion from the cell theory because they have multiple nuclei within one cell so I think it would be very difficult to synthesis such specific protein outsde the muscles. Plus the fact that actin is a monomere and undergoes polymerisation (normally it is globular protein but after polymerisation it becomes fibrous) after protein sythesis is quite an argument for sarcoplasmic reticulum.
13. ## May 2014 Biology HL TZ2 Paper 1 and 2

II know that some (quite big) part of my classmate chose endoplasmic reticulum (proteins for exocytosis) but some (including me) chose sarcoplasmic reticulum. While one of the best students in our class picked rough endoplasmic reticulum pointing that actin is a fibrous protein so i has mainly secondary sturcture and does not need any further modification so it will be just synthesised and then exocitosised. Anyway I'm confused with this question... I chose sarcoplasmic reticulum too cuz I think I read on ib.bioninja before that the muscle fibres have this layer called the sarcoplasmic reticulum instead of the endoplasmic reticulum I thought that sarcoplasmic reticulum mainly functions in storage of calcium ions but it's a good point though. I just checked for muscle cell structure and surprisingly in the muscle cells there are no endoplamis reticulums or golgi apparatuses so I think it is narrowed down only to sarcoplasmic reticulum..
14. ## May 2014 Biology HL TZ2 Paper 1 and 2

II know that some (quite big) part of my classmate chose endoplasmic reticulum (proteins for exocytosis) but some (including me) chose sarcoplasmic reticulum. While one of the best students in our class picked rough endoplasmic reticulum pointing that actin is a fibrous protein so i has mainly secondary sturcture and does not need any further modification so it will be just synthesised and then exocitosised. Anyway I'm confused with this question...
15. ## Biology SL - Papers [1] [2] - Discussion!

They take all of the result and make Gauss curve and then calculate so that some percetage of the population get 7, some 6 etc etc so it is very possible that if the exams are hard and a lot of students get lower results, the grade boundries will also be not that high, so no worries
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