**Higher level Biology 2012 Before/After**

partyatmygaff

finality wrote: »

Do you think "they have differing ratios of carbon to hydrogen to oxygen" would be acceptable, partyatmygaff?

Yeah, i'd say that would be a fine answer. It's more or less the same thing as saying that some fats are saturated while others aren't.

A way of understanding "saturation" in chemistry is that a saturated compound is "saturated" with hydrogens. Double/Triple bonds reduce the total number of hydrogens in the compound which reduces its level of saturation and makes the compound unsaturated. As you'd imagine, that means that the chemical ratios for a saturated and unsaturated compound are different.

QueenOfLeon

Fiona1993 wrote: »

Oh holy ****.. I've done the EXACT same.... Noooooooooooo

YeaaahFaoiSin wrote: »

Me too

Ye should be alright. There was another question on the paper that specifically said that you had to identify which one you were talking about (for the grey and white matter question I think), but for that question, if you started talking about L-Dopa they'd have to be extremely picky to mark you down for not saying if it was paralysis or Parkinson's you were treating.

Mani09

QueenOfLeon wrote: »

Fiona1993 wrote: »

Oh holy ****.. I've done the EXACT same.... Noooooooooooo

YeaaahFaoiSin wrote: »

Me too

Ye should be alright. There was another question on the paper that specifically said that you had to identify which one you were talking about (for the grey and white matter question I think), but for that question, if you started talking about L-Dopa they'd have to be extremely picky to mark you down for not saying if it was paralysis or Parkinson's you were treating.

I just said absence of neurotransmitter loss of dopamine .... Would that be ok

jos360

whatsec wrote: »

My biology teacher is a correcter so we asked her all this stuff before the exam.

She said for section A if two answers are written down and one is wrong they cancel each other out. if three answers are written and only one is wrong, you get the marks.
the same applies for section B.

she said for the majority of section C you can write as much as you like and once you have the key words you get the marks. she used an example of how one time she was correcting a question about labour, and the student was like "his water breaks and he goes into the first stage of labour" and they got full marks because they had the words "labour" and "water breaks", even though they were talking about a man.

I think the negative marking thing you spoke about above applies only to questions that say give 2/3/4, which isn't too many questions. for the open ones you can write anything at all and they just pick out the right bits.

also, anything written with brackets around it isn't corrected.

My biology teacher (Kevin Maume) wrote the syllabus and thats not how he marks...

SellingJuan

Hayezer wrote: »

Phagocyte okay for other WBC?
And whats function of Suppressor T cells? Couldn't really remember but I put down 'shuts down immune system after infection has been dealt with' ? Somewhat right? Literally too lazy to look it up in book :L :pac:

Stops the killer T cells

Fergus_ wrote: »

Auxin is an example of a plant growth regulator right?

Yes and ethene is too.

Caoimhelicious wrote: »

Eeek I said there were no root hairs !?
So did I should be fine...

Also said how companies could use this info about the colours was used coloured lights or use stained glass in their greenhouses??

Yea basically filter out certain colours

Sunny!! wrote: »

for spongy bone is a function support??

Its function is to make red blood cells

gethepoints

Yeovil247 wrote: »

"How can a plant escape captivity?" They've gone mad this year! I just imagined a plant plucking its roots out and hoping the fence. I think I did fairly well anyway, maybe B1/A2 but that ecology question was quite strange.

For that one I wrote : dispersing its seeds through wind, water, burst dispersal so it can grow somewhere else. Hopefully they'll give marks for that.

fanof

jos360 wrote: »

My biology teacher (Kevin Maume) wrote the syllabus and thats not how he marks...

1.Did he, really? (write the syllabus) ....interesting!!!!
2.Markers mark the way the marking conference decides they will mark.

fanof

bazinga_ wrote: »

i am kicking myself right now, i lest an hour early and only just realized i wrote about a plant tissue not animal :mad: :mad: :mad: :mad:
could have sworn it was plant, i read over it so many times!

and i wrote auxin not IAA for plant growth regulator
think my parents may be right about me probably losing my course just cos i left early i felt like i was only doubting and second-guessing myself so i may as well leave..

I know it's a bit late now but it's NEVER a good idea to leave early. Read questions again slowly and carefully, its amazing what you miss if you skim over questions under exam pressure. The time allocated is usually needed to answer well.

fanof

jos360 wrote: »

-
-It could be spongy bone or red bone marrow I'm pretty sure (My textbook was written by the guy who designed the syllabus and his diagram is labeled as such)

Which textbook is this?

fanof

smithy77 wrote: »

Lipids have a Glycerol and 3 fatty acids.
Phospholipids have a Glycerol, 2 fatty acids and a phosphate

I think that is exactly what they were looking for.

FaoiSin

From which tissues does the placenta develop?

Would Embryonic and Uterine be acceptable for this?

Edit: Found these were accepted on the 2009 Marking Scheme

smithy77

fanof wrote: »

I think that is exactly what they were looking for.

Really? I thought the whole lipid and phospholipid thing was wrong?

YeaaahFaoiSin wrote: »

From which tissues does the placenta develop?

Would Embryonic and Uterine be acceptable for this?

Edit: Found these were accepted on the 2009 Marking Scheme

I only said Embryonic, couldn't think of the other one.. oh well.. half marks:pac:

rosualt

fanof wrote: »

smithy77 wrote: »

Lipids have a Glycerol and 3 fatty acids.
Phospholipids have a Glycerol, 2 fatty acids and a phosphate

I think that is exactly what they were looking for.

So was I way off by just saying the fatty acids could vary? bit of a vague question though, fats can be different in so many ways!

Sunny!!

rosualt wrote: »

So was I way off by just saying the fatty acids could vary? bit of a vague question though, fats can be different in so many ways!

do people think they will accept fatty acids?

ChemHickey

smithy77 wrote: »

Really? I thought the whole lipid and phospholipid thing was wrong?



I only said Embryonic, couldn't think of the other one.. oh well.. half marks:pac:

I said Uterine and Chorionic tissues. I was certain I was right!?

DepoProvera

ChemHickey wrote: »

I said Uterine and Chorionic tissues. I was certain I was right!?

It's outer blastocyst and endometrium cells I think!

Mista

For the fat questipon, i said the 3 fatty acids can differ, or one of them can be replaced with a phosphate as in the case of phospholipids.. would that be alright?

finality

Partyatmygaff just clarified the fats question.

partyatmygaff wrote: »

A few suitable answers:
Length of the fatty acids
Types of fatty acids
Saturated/Unsaturated fatty acids
Isomers (Although i'm not sure if that falls under "chemical composition")

I don't think the Phospholipid and Triglyceride answer will work.
(...)
So in short... phospholipids and fats are both types of lipids. Phospholipids are not types of fats.

partyatmygaff

smithy77 wrote: »

Lipids have a Glycerol and 3 fatty acids.
Phospholipids have a Glycerol, 2 fatty acids and a phosphate

You're right about phospholipids but you're confusing lipids and fats in the first sentence.

Sunny!! wrote: »

do people think they will accept fatty acids?

If you said "Different fatty acids" or a "Difference in fatty acids" I'd say you ought to be fine.

Mista wrote: »

For the fat questipon, i said the 3 fatty acids can differ, or one of them can be replaced with a phosphate as in the case of phospholipids.. would that be alright?

Depends on the marking scheme. You're right about the 3 fatty acids differing but introduced a wrong answer by mentioning phospholipids. Best case scenario, they give you the marks. Worst case scenario, negative marking means you get nothing for that question.

Fiona1993

Mani09 wrote: »

QueenOfLeon wrote: »

Fiona1993 wrote: »

Oh holy ****.. I've done the EXACT same.... Noooooooooooo

YeaaahFaoiSin wrote: »

Me too

Ye should be alright. There was another question on the paper that specifically said that you had to identify which one you were talking about (for the grey and white matter question I think), but for that question, if you started talking about L-Dopa they'd have to be extremely picky to mark you down for not saying if it was paralysis or Parkinson's you were treating.

I just said absence of neurotransmitter loss of dopamine .... Would that be ok

Ya I didn't say Parkinson's... I just gave the answers but didn't state what I was talking about.... How many marks would you lose for drawing a sensory neuron instead of a motor?? The functions are the same etc...

Mista

ChemHickey wrote: »

I said Uterine and Chorionic tissues. I was certain I was right!?

I said Embryo (chorions) and Mother (uterus) Hope I get the marks..

Fiona1993 wrote: »

Ya I didn't say Parkinson's... I just gave the answers but didn't state what I was talking about.... How many marks would you lose for drawing a sensory neuron instead of a motor?? The functions are the same etc...

Not a lot if any... Is the motor one the one with the cell body at the beginning?

ei.sderob

I said chorionic villi and the mothers blood vessels and explained how they intertwined and stuff. Think that should be grand like. I just put in a lot of extra info in my answers to be sure. Yeah, the motor neuron has the cell body at the start:D

Fiona1993

Mista wrote: »

ChemHickey wrote: »

I said Uterine and Chorionic tissues. I was certain I was right!?

I said Embryo (chorions) and Mother (uterus) Hope I get the marks..

Fiona1993 wrote: »

Ya I didn't say Parkinson's... I just gave the answers but didn't state what I was talking about.... How many marks would you lose for drawing a sensory neuron instead of a motor?? The functions are the same etc...

Not a lot if any... Is the motor one the one with the cell body at the beginning?

Yeah, and two branches of neurotransmitter swellings. I said: "Tissue from the endometrium of the mother and tissue from the chorion of the baby"... That's ok isn't it?

FaoiSin

Embyonic and Uterine is the answer from 2009 for the same question but I'd say you'll be grand.

Mista

ei.sderob wrote: »

I said chorionic villi and the mothers blood vessels and explained how they intertwined and stuff. Think that should be grand like. I just put in a lot of extra info in my answers to be sure. Yeah, the motor neuron has the cell body at the start:D

Thank frig! I was worried I got this one wrong.. would be like me to mix things up

biohaiid

ei.sderob wrote: »

I said chorionic villi and the mothers blood vessels and explained how they intertwined and stuff. Think that should be grand like. I just put in a lot of extra info in my answers to be sure. Yeah, the motor neuron has the cell body at the start:D

Chorionic villi and the mother's blood vessels make up the embryotic tissue (as far as I know).
And the other its uterine I think.

Just to clear it up for the other people who were wondering.

ei.sderob

biohaiid wrote: »

Chorionic villi and the mother's blood vessels make up the embryotic tissue (as far as I know).
And the other its uterine I think.

Just to clear it up for the other people who were wondering.

The uterine tissue is the mother's blood vessels like. The blood vessels couldn't be coming from anywhere else like:P I think that's right anyway........

cocopopsxx

How many marks do ye reckon the plant escaping captivity question could possibly get?

ConTheCat

I did absolutely terrible. I should of taken pass, passed about 3 class tests and failed the mocks. WHAT WAS I THINKING!! Don't even think I answered enough for a D3. Said before the test "It'd prob look better to fail honours than pass" UGH

Megamoo

Does anyone think it was really hard to interpret the questions this year.The genetic crosses in perticular !