Hi, I cant see the answers..
Some multiple choice was confusing, but overall, I guess bio was pretty good :)
Hey, I'm pretty sure the answer to question 20 is not A. T cells do not produce antibodies.
Hey! It definitely could be D; the wording of the question is a bit ambiguous, hey! Definitely discuss answers here; do you agree? Do you disagree? Why or why not? If we get some consensus, I'll update the answers later on :)
This blank thing is coming up...
That's seriously weird! The direct link is HERE and HERE; maybe try take a look at the spoiler using a different web browser?
i put B for number 19 because i read its the scientests discovery so im guessing im probably wrong
for 20 i put d because it was the most correct in my opinion
Hey! It definitely could be D; the wording of the question is a bit ambiguous, hey! Definitely discuss answers here; do you agree? Do you disagree? Why or why not? If we get some consensus, I'll update the answers later on :)I got D for 20 as well. T cells do not produce antibodies. For 19 I put A.
I got D for 20 as well. T cells do not produce antibodies. For 19 I put A.
PLOT TWIST: we just had a UNSW medical student (Band 6 in Bio) because "B-cells don't directly destroy anything, only make antibodies. T cells can directly kill antigens".Plot twist maybe. C is starting to look more correct if it can't be D
Thoughts on this all? Could the consensus be wrong or is our med student mistaken?
PLOT TWIST: we just had a UNSW medical student (Band 6 in Bio) because "B-cells don't directly destroy anything, only make antibodies. T cells can directly kill antigens".
Thoughts on this all? Could the consensus be wrong or is our med student mistaken?
Okay...with question 20... I actually put C.
And my line of thinking was this:
A) T cells don't produce antibodies so NOPE
B) It's the HELPER T cells that activate B cells
and
D) B cells can't directly destroy any antigens...They can only produce antibodies to IMMOBILISE them. (But not destroy)
And with C):
Lymphocytes actually include both B cells and T cells..
So that's why I think C) is actually the correct answer
Our Med student has actually changed her answer to C! This was one fucked question...
Thank you guys!! But can someone explain 23 (b)? I thought salt concentration in the blood would decrease.
Hello, it is I - the med student.
I say 20 is C because of the theory of Clonal Selection.
Plus all the others sound wrong.
It's an extremely confusing question though.
Hey Naomi do we still have a chance of scraping band 6? I know I got 14/20 for multiple choice (cries) which means I only have 4 marks left to mess up in Section 2 and 3 :O
I got A for question 20 - Cytotoxic t cells don't activate B cells, c is irrelevant, and B cells never destroy anything - they trap them and take the to lymph nodes/have markers that detect antigen markers but again, don't destroy.
Hello, it is I - the med student.
I say 20 is C because of the theory of Clonal Selection.
Plus all the others sound wrong.
It's an extremely confusing question though.
Hello, it is I - the med student.
I say 20 is C because of the theory of Clonal Selection.
Plus all the others sound wrong.
It's an extremely confusing question though.
Did the graph need to be in pen because I drew in pencil?Graphs in science are supposed to be drawn with pencil
_______________________________________________________________________________________________________Ok good thanks
Kevin 217, it says you're allowed to use pencil to draw diagrams (i.e. graphs), so it should be ok :3
Graphs in science are supposed to be drawn with pencilJust on the subject, everything in maths is supposed to be in pen right?
Just on the subject, everything in maths is supposed to be in pen right?
Hey Naomi do we still have a chance of scraping band 6? I know I got 14/20 for multiple choice (cries) which means I only have 4 marks left to mess up in Section 2 and 3 :O
Hey! I'm not claiming to be an expert or anything, but couldn't the answer to question 19 have to be B?
Technically, since it is suggesting that they use the patients "own" melanoma cells in order to create the vaccine, wouldn't it be impossible for self-antigens to be present on the cancer cells and for them to still be able to fight the melanoma?
Additionally, for question 20... The question kind of could be either C or D couldn't it? Though a Vaccine generally isn't known to specifically be designed to produce lymphocytes via cellular division, technically that is what it does? Additionally, for D whilst antibodies do not directly destroy antigens, technically the production of Plasma B-Cells do produce Antibodies that are responsible for the process of killing the antigens, right? So I think the question could go both ways...
Hey! I'm not claiming to be an expert or anything, but couldn't the answer to question 19 have to be B?
Technically, since it is suggesting that they use the patients "own" melanoma cells in order to create the vaccine, wouldn't it be impossible for self-antigens to be present on the cancer cells and for them to still be able to fight the melanoma?
Additionally, for question 20... The question kind of could be either C or D couldn't it? Though a Vaccine generally isn't known to specifically be designed to produce lymphocytes via cellular division, technically that is what it does? Additionally, for D whilst antibodies do not directly destroy antigens, technically the production of Plasma B-Cells do produce Antibodies that are responsible for the process of killing the antigens, right? So I think the question could go both ways...
For question 27b, I said that the mutation affects the lignin in the spiral thickenings, so it would also affect the lignin in the leaves that gives them rigidity. Was I completely off by saying this?
... Is there even lignin in the leaves to give them rigidity??
can someone please explain what on earth is ringbarking ?
It's when you cut around a tree in a circle, essentially destroying the outer layer! This destroys the phloem, which is integral in the transportation of nutrients and sugars to the roots. Thus, the tree will die! (Is a sad face more appropriate?)
Hey guys
Funnily enough, I'm having the opposite anxiety, were it seems I aced multiple choice but my short responses were weaker and I have some questions.
1) For the graph, I was an idiot and did the scale from 0-100. The curve is still visible, with all points properly plotted but will I lose a mark since the scale is too large?
2) For the xylem mutation question, I had two main points. For the first point I briefly went over how xylem vessels are composed of rigid lignin walls and that this mutation would effectively decrease the amount of lignin, decreasing rigidity and having a wilting effect.
For my second point however, I said something that I haven't even heard anyone else talk about yet. I said that thinning the cell walls of the xylem will effectively thin the walls of the xylem vessel causing it to have a larger diameter. Water moves in the xylem via the TRACT model, in which water passively moves up the vessel by adhering to the cell walls of the vessel alongside the positive pressure that is created in the roots and the negative pressure created in the leaves due to transpiration. By increasing the diameter of the vessel however the SA:V of water contact to xylem walls has decreased and the pressure that is created in the xylem is lessened. This leads to water moving more slowly up the vessel and hence cells that require water for photosynthesis etc receive it more slowly. Overtime this decrease in metabolic rate can potentially lead to wilting as the plant dies
Did i screw myself?
edit: The answer about water leaving the xylem via osmosis at unintentional locations doesn't make too much sense to me which is partly why I avoided it. I've pretty much accepted it as the correct answer as everyone else seems to have put it down but wouldn't eventual osmotic equilibrium alongside the areas where it is unintentially left mean that water will end up still travelling up the plant to the areas it is meant to? I guess the point is that its less efficient water travel?
Firstly as long as your scale is even then I'm sure they won't take marks off for it. But wasn't the question to draw a line of best fit not a curve of best fit? Or did I stuff that up??
Secondly I wrote the exact same reasoning about the surface area volume slowing the water flow in that xylem question so your not alone. I hope its right
Yeah it was line of best fit, didn't mean to confuse you, accidentally wrote that in the post even though I did a line not a curve.
Good to know I'm not alone.
Hopefully that answer gets some marks.
I got D for 20 as well. T cells do not produce antibodies. For 19 I put A.