2010 biology unit three exam

[lexitu]

Okay about 20, I can definitely see it as being D. But I was thinking along the lines that lipids have other functions too. How about the cuticle? This may be structural...
About 20, I think B is more correct. Metabolised could refer to either anabolism or catabolism.

[crayolé]

Oh thats also true, whereas the proteins being saturated means they are filled with molecules <---yet another question that could go both ways? =/ That would make it three, a record i think? ;]

The waxy cuticle is usually referred to as a feature that protects from water loss

[shinny]

About 20, I think B is more correct. Metabolised could refer to either anabolism or catabolism.

The way they worded it sounds more like catabolism to me. You don't tend to word it like that when you mean anabolism from my experience, but I'm not sure if that's an 'official' meaning of the word or not.

[lexitu]

Yeah I know what you mean Shinny, I have never heard it used as anabolism. Regarding 20, I think I contradicted myself nicely: the cuticle is probably an example of how lipids help protect cells from dehydration.

[kasidji]

These questions are all so ambiguous. I really feel like they're not even examining our knowledge of the course, but our logical ability to spot loopholes and finicky contradictions. The practice exams didn't feel like that.

[jcheah12]

can someone please type out optionS out for me please ? I can't access the paper on my phone.

Thanks.

[jcheah12]

opps I meant option D for the rate of movement graph question

[lexitu]

as solute R is metabolised within the cell, rate of movement decreases.

[jcheah12]

thanks

shinny, let me explain q21 to you.

the graph shows that as solute conc. increases outside the cell, the rate of movement of solute across the membrane increases.
okay lets get that straight.

this thus means that there is a higher solute conc. (lower water conc.) outside the side and a lower solute conc. (higher water conc.) inside the cell. Thus the movement would be from inside to outside.

However [regarding option D] as solute R is metabolised in the cell (increasing solutes within the cell), there will be a higher solute conc. inside the cell.

This will then even out the conc. gradient, thus the rate of movement across the membrane decreases.

HOWEVER, in all due respect I also agree with option B so I'm not saying you're wrong Shinny, but I'm hoping the VCAA Biology examiners pick up on the countless errors that were in this paper.

(:

[kasidji]

Have we got any word on the blue vs. red light question?

[simpak]

Do I even need to be continuing to complete this paper guys?
Btw, Red.
I can't scan till morning will wake whole house up.

[simpak]

Okay let me explain red before you all ask.
Chlorophyll a absorbs light directly, other pigments are just helping handz!
Referring to graph in Biozone, chlorophyll a has greatest absorption at 560~ nm.
Ie, red...
So, red.

[kasidji]

Do I even need to be continuing to complete this paper guys?
Btw, Red.
I can't scan till morning will wake whole house up.

ahaha, take your time.. i didn't know scanners were that loud! then again, i've never had one
the reason there was confusion with red vs. blue/violet was because tehre's a particular graph in nature of biology i think it is where absorption spikes at blue/violet.

[simpak]

Do I even need to be continuing to complete this paper guys?
Btw, Red.
I can't scan till morning will wake whole house up.

ahaha, take your time.. i didn't know scanners were that loud! then again, i've never had one
the reason there was confusion with red vs. blue/violet was because tehre's a particular graph in nature of biology i think it is where absorption spikes at blue/violet.

Yes it spikes for chlorophyll B.
Perhaps I can take photos of these if the dlsr permits.

[simpak]

Weeee I love being the only person up because my computer has shit ram and it's my six month anniversary tomorrow so I won't be back till Friday night.