***2015 LC Biology - All levels - June 9th***

Jammysticks

Leitrim96 wrote: »

Which carbohydrate is always found in DNA?

(deoxy)ribose

sushua

Leitrim96 wrote: »

Which carbohydrate is always found in DNA?

sugar - deoxyribose

Bah_Humbug

Is the chemical composition of chromosomes protein? I had that but then crossed it out and wrote phosphate/sugar/nitrogen thinking of the DNA part.. Will I get marks? because technically...?

Leitrim96

sushua wrote: »

sugar - deoxyribose

Would one lose marks for just ribose?

KA97

I without a doubt failed this exam, was a horrible paper in my opinion, the questions were really tough.

Jammysticks

Bah_Humbug wrote: »

Is the chemical composition of chromosomes protein? I had that but then crossed it out and wrote phosphate/sugar/nitrogen thinking of the DNA part.. Will I get marks? because technically...?

It's protein and nucleic acid/DNA. The other answers might do, but probably not. Phosphate and Nitrogen are elements, not chemicals.

KA97 wrote: »

I without a doubt failed this exam, was a horrible paper in my opinion, the questions were really tough.

It was utterly bizarre in comparison to previous years. Just like last year. Loads of people would've been unhappy.

Leitrim96 wrote: »

Would one lose marks for just ribose?

I don't think so. In the marking scheme they often say the answer is (deoxy)ribose, meaning the deoxy bit is optional.

Leitrim96

What labels were needed for the yeast reproduction apart from colony and just a standard yeast cell?

Jammysticks

Leitrim96 wrote: »

What labels were needed for the yeast reproduction apart from colony and just a standard yeast cell?

Probably nucleus too.

sushua

For two parts of the large intestine could you have said colon & caecum?

Jammysticks

blue_velvet wrote: »

Quick question: what are the two organs specific to the immune system?! Had to make that one up!

I said the spleen and the thymus?[/QUOTE]

That's what most people who got the question said. It's not on our course, so any reasonable attempt will probably get marks. Both are good answers.

sushua wrote: »

For two parts of the large intestine could you have said colon & caecum?

Yeppers!

Leitrim96

Jammysticks wrote: »

Probably nucleus too.

You're right. Damn it. Thanks

Cazz19

Was the virus question in the shorts labelled wrong? The arrow B was pointing at the viral nucleic acid, but the question was asking for biomolecules? Same was A, pointing at the protein coat, yet asking for chemical? I was very confused by this. Maybe I didn't interpret the question right

Jammysticks

So long, and thanks for all the fish.

sushua

Cazz19 wrote: »

Was the virus question in the shorts labelled wrong? The arrow B was pointing at the viral nucleic acid, but the question was asking for biomolecules? Same was A, pointing at the protein coat, yet asking for chemical? I was very confused by this. Maybe I didn't interpret the question right

Yeah I got confused about that aswell.. I still said protein and DNA though

Jammysticks

Cazz19 wrote: »

Was the virus question in the shorts labelled wrong? The arrow B was pointing at the viral nucleic acid, but the question was asking for biomolecules? Same was A, pointing at the protein coat, yet asking for chemical? I was very confused by this. Maybe I didn't interpret the question right

That may have been mis-labelled, in which case marks will be awarded for however you interpreted the question.

IrishLoriii

The more I read this thread the lower my grade in my head is going :O

Peregrine

IrishLoriii wrote: »

The more I read this thread the lower my grade in my head is going :O

Well, stop reading it!

theRB

HL

Thought the first four long questions were really easy and we were so lucky to get that tadpole question. Found the short questions difficult but overall it was easier than I expected.

Kermin

Messed up 10c had it right first time round, checking back over my answers "hang men are XY not XX" changed it all to be wrong There goes a 6.25%, minimum one grade max 2...

randylonghorn

IrishLoriii wrote: »

The more I read this thread the lower my grade in my head is going :O

The grade in your head doesn't matter a damn, it's the one in the sheet in August which matters.

Very often, students get hung up on the bits they get wrong (or think they got wrong) and underestimate what they got right, and end up depressing themselves needlessly.

Post-mortems are only a good idea on CSI!

westernfrenzy

randylonghorn wrote: »

Post-mortems are only a good idea on CSI!

CSI: Leaving Cert

ThatsTheShtuff

I was counting on it for an A1.
Gone, just like that.

(Higher level)

Bah_Humbug

So Q 5 (a) says determine the conc. of the potato cells, which is grand, but on our paper it said something like "determine the concentration of the solution" and then our examiner said there was a mistake and told us to write in "at the start of the experiment" which made no sense. Just wondering did this happen in all exam centres??

Kat97

Bah_Humbug wrote: »

So Q 5 (a) says determine the conc. of the potato cells, which is grand, but on our paper it said something like "determine the concentration of the solution" and then our examiner said there was a mistake and told us to write in "at the start of the experiment" which made no sense. Just wondering did this happen in all exam centres??

Yeah it happened in mine. They read out the corrections at the start!

Dianabluex

Bah_Humbug wrote: »

So Q 5 (a) says determine the conc. of the potato cells, which is grand, but on our paper it said something like "determine the concentration of the solution" and then our examiner said there was a mistake and told us to write in "at the start of the experiment" which made no sense. Just wondering did this happen in all exam centres??

it happened to us as well everyone was laughing because we couldn't understand the examiner and there was another correction on pg 8 i think

ronivek

Bah_Humbug wrote: »

So Q 5 (a) says determine the conc. of the potato cells, which is grand, but on our paper it said something like "determine the concentration of the solution" and then our examiner said there was a mistake and told us to write in "at the start of the experiment" which made no sense. Just wondering did this happen in all exam centres??

Well the concentrations of solution and potato would change over time; so it's more accurate to say "at the start of the experiment" rather than have people trying to work out averages or something weird.

AnnaTorvFan

What was true/false?
(a) Meiosis is an important source of variation.
(b) Mitosis occurs in mature red blood cells in humans.
(c) During mitosis the nuclear membrane temporarily disappears.
(d) Meiosis gives rise to the haploid condition.
(e) In multicellular organisms mitosis functions primarily in growth.
(f) In plants, a cell plate forms during telophase of mitosis.
(g) The human zygote divides by meiosis.

ronivek

AnnaTorvFan wrote: »

What was true/false?
(a) Meiosis is an important source of variation.
(b) Mitosis occurs in mature red blood cells in humans.
(c) During mitosis the nuclear membrane temporarily disappears.
(d) Meiosis gives rise to the haploid condition.
(e) In multicellular organisms mitosis functions primarily in growth.
(f) In plants, a cell plate forms during telophase of mitosis.
(g) The human zygote divides by meiosis.

All true apart from (b) and (g) I think.

AnnaTorvFan

ronivek wrote: »

All true apart from (b) and (g) I think.

Damn, said a and g =/

fin709

AnnaTorvFan wrote: »

What was true/false?
(a) Meiosis is an important source of variation.
(b) Mitosis occurs in mature red blood cells in humans.
(c) During mitosis the nuclear membrane temporarily disappears.
(d) Meiosis gives rise to the haploid condition.
(e) In multicellular organisms mitosis functions primarily in growth.
(f) In plants, a cell plate forms during telophase of mitosis.
(g) The human zygote divides by meiosis.

T
F
T
T
T
T
F
Thats what i put, im not sure but i think thats right not 100% sure on e) or b)