2012 VCAA Biology Unit 3 Suggested Answers

[Panicmode]

In Q8d, the stem of the q said that "they do not require prime soil, reliable rainfall and a particular climate" so would temperature still be an accepted condition?

Yes. The algae still use enzymes. If the pond were to freeze over the algae wouldn't be much use.

[spherelin]

on the second last question could you say taking the pyruvate out of the system would save more co2?
and on the last question would oxygen levels and glucose levels be accepted?

idk about glucose, but i said oxygen and light intensity... but now i'm beginning to doubt oxygen. :/

[Highacheiver]

hey guys, what do you think the cut off will be for an A+? how many marks do you reckon you could lose?

[spherelin]

hey guys, what do you think the cut off will be for an A+? how many marks do you reckon you could lose?

Yeah, i think that would be legit as long as you emphasised the fact that plants have massive ones and animal's only have small ones.

[ligands]

hey guys, what do you think the cut off will be for an A+? how many marks do you reckon you could lose?

Yeah, i think that would be legit as long as you emphasised the fact that plants have massive ones and animal's only have small ones.

lol does this not make sense?

[spherelin]

hey guys, what do you think the cut off will be for an A+? how many marks do you reckon you could lose?

Yeah, i think that would be legit as long as you emphasised the fact that plants have massive ones and animal's only have small ones.

lol does this not make sense?

LMFAO OMG, i was supposed to answer a person with that on another post... wow awkward. clearly fried because of biology

[susan]

Thanks for the answers
Although damn, lost so many marks!

[Highacheiver]

hahahahaha! thats okayy, but predictions on the cut off anyone?

[kensan]

For 4c(i), I say that the memory cells had no effect as it had been too long since the last vaccination and they had most likely have died off.

7b, I said intact skin for one of the first lines of defense. Would that be wrong as mosquitoes can penetrate it?

For 8d, I said, keep animals away as they might use it as a food source, and, keep toxic chemicals created by the power station away from the plants.  Is that appropriate?

Thanks for the solutions too, greatly appreciated

[mousieka]

I can't open the solutions?

[Panicmode]

I can't open the solutions?

It's saved as a Microsoft Word Document.

Here attached is a PDF version.

[bertiebotts]

I have a question about q6 multiple choice, it says plants growing in soil with low levels of nitrogen may be unable to produce: ribonucleic acids, triglycerides, cellulose and sucrose.
Now I know that C and D are incorrect.
But triglycerides are composed of CHONP as are ribonucleic acids, right? So wouldn't that mean that both options are correct?

Or is this just me being stupid (as usual haha)?

[Panicmode]

I have a question about q6 multiple choice, it says plants growing in soil with low levels of nitrogen may be unable to produce: ribonucleic acids, triglycerides, cellulose and sucrose.
Now I know that C and D are incorrect.
But triglycerides are composed of CHONP as are ribonucleic acids, right? So wouldn't that mean that both options are correct?

Or is this just me being stupid (as usual haha)?

Triglycerides do not contain N. They are made from glycerol (CHO) and fatty acids (CH)

[bertiebotts]

I have a question about q6 multiple choice, it says plants growing in soil with low levels of nitrogen may be unable to produce: ribonucleic acids, triglycerides, cellulose and sucrose.
Now I know that C and D are incorrect.
But triglycerides are composed of CHONP as are ribonucleic acids, right? So wouldn't that mean that both options are correct?

Or is this just me being stupid (as usual haha)?

Triglycerides do not contain N. They are made from glycerol (CHO) and fatty acids (CH)

I am such an idiot. I thought of triglyceride as a lipid...silly!!

Also, with the multiple choice question about Yellow Fever, it asked for two parts of the first line of defence which might help to prevent against infection if they have been exposed to the virus. I took already been exposed to the virus to mean that they have been bitten by the mosquito. Therefore, that would mean that intact skin has been surpassed, as has lysozymes in sweat. Is that right?

[Panicmode]

I have a question about q6 multiple choice, it says plants growing in soil with low levels of nitrogen may be unable to produce: ribonucleic acids, triglycerides, cellulose and sucrose.
Now I know that C and D are incorrect.
But triglycerides are composed of CHONP as are ribonucleic acids, right? So wouldn't that mean that both options are correct?

Or is this just me being stupid (as usual haha)?

Triglycerides do not contain N. They are made from glycerol (CHO) and fatty acids (CH)

I am such an idiot. I thought of triglyceride as a lipid...silly!!

Also, with the multiple choice question about Yellow Fever, it asked for two parts of the first line of defence which might help to prevent against infection if they have been exposed to the virus. I took already been exposed to the virus to mean that they have been bitten by the mosquito. Therefore, that would mean that intact skin has been surpassed, as has lysozymes in sweat. Is that right?

Triglycerides are a lipid, but they are a particular type of lipid. Just as DNA does not contain uracil but nucleic acids can contain uracil. I assumed the same thing, however I wasn't sure how examiners would mark (hence my suggestions).