haha ok, i know what safety issues are, lolKujah said:Risk assessment = safety issues.
didnt know they were the same
haha ok, i know what safety issues are, lolKujah said:Risk assessment = safety issues.
here's what i posted in another thread for this guy. lol i just did them in paint, very simplified. this is how our teacher taught them to us:barry1 said:Draw transverse and longitudinal sections of phloem and xylem tissue (hope this question hasn't been asked before)
I doluucy said:does anyone here do the genetics topic?
yeah, that's even easier. just like this:Takuto said:haha i saw that, thats cute. LOL
btw, transverse = top view?
Sweet can you please help me with this dot pointmidifile said:I do
Gene expression is pretty much a fancy name for polypeptide synthesis.luucy said:Sweet can you please help me with this dot point
oultine the current understanding of gene expression......im really confused!
YESSS!Takuto said:i do communications
lol, there was a past hsc MC question that had a crazy diagram and you had to name which was xylem and phloem + whether they were active or passive transport
anyone remember this? so confusing
According to the answer of the MC question (I remember doing it too) it is active.danz90 said:YESSS!
I got that wrong.. stupid me.
The thing to that question was that realising the vessel with the squiggly, spirally things in the middle was the xylem (the advice line guy said that they are the tracheids - and thats how u distinguish from phloem). Hence passive transport occurs in xylem... and obviously the opposite for phloem.
However, one confucious thing... is all translocation in phloem active? Because if there is a pressure gradient, and the substances are moving along it.. is it passive? or is it active because the pressure gradient is required for the translocation?
okay that makes alot more sense compared to the notes i was looking at....another question are we meant to know what the substrate is?midifile said:Gene expression is pretty much a fancy name for polypeptide synthesis.
What I have in my notes is that:
A gene is either on all the time unless there is enough product present, or off all the time unless there is too much substrate present.
In the first case, when there is enough of the product (ie the polypeptide) this acts as a repressor, stopping polypepetide synthesis until the concentration of that polypeptide decreases.
In the second case, when there is too much of the substrate present, this activates the gene, resulting in polypeptide synthesis, until the concentration of the substrate decreases
maybe it was this one?midifile said:Im pretty sure there was a MC question in a past paper which asked whether it was passive or active and the answer was active.
I think it is becasue when loading and unloading occurs these occur through active transport (once the concetration of sucrose in the phloem is greater than in the source cell, or less than the sink cell), which is why it is considered active
No you dont have to know any specific substrates, but just know that the gene codes for the production of an enzyme which catalyses a specific reaction, converting a specific substrate(s) into a specific product(s).luucy said:okay that makes alot more sense compared to the notes i was looking at....another question are we meant to know what the substrate is?
i dunno. That diagram doesnt seem right. Xylem are meant to be narrower than phloem (which would make xylem M) and there is no way that substances move by active transport in xylem.danz90 said:maybe it was this one?
basically here i think all we had to realise was that the xylem was in the centre (notice the smaller vessels).. and thats where passive transport occurs. phloem, larger vessels, were on outside, where active transport occurs.
Edit: well well.. i'm wrong again. The answer is B. But why would xylem be on the outer part??