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July 24, 2019, 08:54:30 am

Author Topic: VCE Biology Question Thread  (Read 1269335 times)  Share 

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Azim.m

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Re: VCE Biology Question Thread
« Reply #10635 on: September 09, 2018, 09:09:52 pm »
0
By which process do calcium ions enter the presynaptic terminal? Active transport or facilitated diffusion?

PopcornTime

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Re: VCE Biology Question Thread
« Reply #10636 on: September 09, 2018, 09:32:02 pm »
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Active Transport. Ions generally move by active transport in general.

Azim.m

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Re: VCE Biology Question Thread
« Reply #10637 on: September 11, 2018, 04:51:04 pm »
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I know it’s not recommended, but could I use a pencil for the exam?

darkz

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Re: VCE Biology Question Thread
« Reply #10638 on: September 11, 2018, 05:05:51 pm »
+1
I know it’s not recommended, but could I use a pencil for the exam?

I don't actually think you're allowed to use pencil - only a blue or black pen
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10639 on: September 11, 2018, 05:12:03 pm »
+3
Definitely only use pen. Your exam will be scanned and pencil doesn’t always show up in scans. It’s not worth the risk.
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Bell9565

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Re: VCE Biology Question Thread
« Reply #10640 on: September 11, 2018, 09:46:23 pm »
+2
Also just to add, not sure if you were considering it but do NOT attempt to get the best of both worlds and use erasable pen - I have heard some horror stories of people using them, then the heat from the scanners actually erasing all the work on the exam due to the heat or something. Not sure how true it is but thought i'd give a heads up
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10641 on: September 12, 2018, 05:59:55 pm »
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What are some traits that define hominoids?

Agimo

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Re: VCE Biology Question Thread
« Reply #10642 on: September 12, 2018, 06:28:57 pm »
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How many practise exams should I do for biology? I am in year 11 but also taking Further 3/4

vox nihili

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Re: VCE Biology Question Thread
« Reply #10643 on: September 13, 2018, 11:06:03 am »
+1
How many practise exams should I do for biology? I am in year 11 but also taking Further 3/4

How long is a piece of string? Classic conundrum tbh!

It's not so much how many you do but how you do them. If you just try to churn through practice exams, you won't get anywhere. However, if you actually take the time to do practice exams to identify any weaknesses then target your study to ameliorating those weaknesses then they become a lot more useful. How many you need to do is really determined by what your goals are and whether or not you're achieving those during practice.
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FabAsianZung

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Re: VCE Biology Question Thread
« Reply #10644 on: September 13, 2018, 09:40:07 pm »
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“• significant changes in life forms in Earth’s geological history including the rise of multicellular organisms, animals on land, the first flowering plants and mammals“

According to this study design dot point, I assume you would have to know the key events of when a particular group of species first appeared. But is this really necessary? I feel like VCAA might not ask ‘direct’ questions on it, but would be used somewhere in another question as a context. Furthermore, if I actually do need to memorize this stuff, do you actually have to remember the time period it occurred in?

One final questions. What the heck is a fossil record? Isn’t that basically stratigraphy, the law of supposition and the law of fossil correlation combined together?

Thanks in advance!
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Bell9565

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Re: VCE Biology Question Thread
« Reply #10645 on: September 13, 2018, 10:40:33 pm »
+3
“• significant changes in life forms in Earth’s geological history including the rise of multicellular organisms, animals on land, the first flowering plants and mammals“

According to this study design dot point, I assume you would have to know the key events of when a particular group of species first appeared. But is this really necessary? I feel like VCAA might not ask ‘direct’ questions on it, but would be used somewhere in another question as a context. Furthermore, if I actually do need to memorize this stuff, do you actually have to remember the time period it occurred in?

Pretty much we were told just to know which order those events specified in the dot point occurred in - I wouldn't memorise them but I'd have some rough idea of what sort of is going on (like I had notes on it but didn't memorise them)

"One final questions. What the heck is a fossil record? Isn’t that basically stratigraphy, the law of supposition and the law of fossil correlation combined together?

Thanks in advance!

Pretty much sorta, the fossil record is all the fossils that have ever been found compiled together. There are some gaps in it, but overall it shows how species evolved over time. It could be used to date things because if there was like a certain fossil known to exist in lets say, the Jurassic period, and it was found somewhere else - it could suggest that that strata of rock is from then.

Not 100% sure about that though, someone else could probably answer that last one better :)
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10646 on: September 13, 2018, 11:12:19 pm »
+1
Quote
Not 100% sure about that though, someone else could probably answer that last one better
You’re right. The fossil record just means any evidence of past life. The others things (stratigraphy, the law of supposition and the law of fossil correlation) are ways to tell how old the past life is.
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FabAsianZung

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Re: VCE Biology Question Thread
« Reply #10647 on: September 16, 2018, 08:16:11 pm »
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“• the human fossil record as an example of a classification scheme that is open to interpretations that are contested, refined or replaced when new evidence challenges them or when a new model has greater explanatory power, including whether Homo sapiens and Homo neanderthalensis interbred and the placement of the Denisovans into the Homo evolutionary tree.”

I understand the “out of Africa” hypothesis and how it is suspected that Homos all originated from Africa and slowly migrated to other places and diverged from there. I also know a little bit about Homo sapiens and Neanderthals interbreeding, as a portion of humans in this present day have Neanderthals DNA in them. And Denisovans was placed into the Homo  evolutionary tree, due to the fact that they interbred with Homo sapiens and Neanderthals.

What I typed up just then, sums up about all I know for this study design dot point. Can anyone expand on this to the level of what I need to know?
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peachxmh

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Re: VCE Biology Question Thread
« Reply #10648 on: September 16, 2018, 09:33:17 pm »
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Hey guys would someone be able to help me with this question? The correct answer is B btw:

The disease cystic fibrosis is caused by a gene mutation that produces an incorrectly formed protein channel, the CFTR (cystic fibrosis transmembrane conductance regulator). When this channel is not formed correctly, chloride ions will not be able to exit the cell. The accumulation of chloride ions causes the movement of water via osmosis.

Based on this information, which of the following are likely consequences of cystic fibrosis?

A. Large amounts of watery diarrhoea as chloride ions in the intestinal tract attract water.
B. Thick sticky mucus outside cells as water remains in the cell rather than move out via osmosis
C. Selective sodium channels provide an alternative passage of chloride ions.
D. Water will be actively transported into the cell following the accumulation of chloride ions.

I chose A as my answer because I thought that there would be a buildup of chloride ions inside the cell, meaning water would move into the cell via osmosis as the environment outside the cell would be hypotonic to the cell? Can someone explain why B is the correct answer instead? :P
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darkz

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Re: VCE Biology Question Thread
« Reply #10649 on: September 16, 2018, 09:40:16 pm »
+6
Hey guys would someone be able to help me with this question? The correct answer is B btw:

The disease cystic fibrosis is caused by a gene mutation that produces an incorrectly formed protein channel, the CFTR (cystic fibrosis transmembrane conductance regulator). When this channel is not formed correctly, chloride ions will not be able to exit the cell. The accumulation of chloride ions causes the movement of water via osmosis.

Based on this information, which of the following are likely consequences of cystic fibrosis?

A. Large amounts of watery diarrhoea as chloride ions in the intestinal tract attract water.
B. Thick sticky mucus outside cells as water remains in the cell rather than move out via osmosis
C. Selective sodium channels provide an alternative passage of chloride ions.
D. Water will be actively transported into the cell following the accumulation of chloride ions.

I chose A as my answer because I thought that there would be a buildup of chloride ions inside the cell, meaning water would move into the cell via osmosis as the environment outside the cell would be hypotonic to the cell? Can someone explain why B is the correct answer instead? :P

Well you are quite right in saying that the water will move into the cell, as there would be a build up chloride ions in them. However, it is not A because the water moves into the cell where it would accumulate. For it to be A, the water has to move out of the cell into the intestinal tract, thereby causing diarrhoea.

Its not C, because a sodium channel is for sodium, so chloride would not be able to pass through
And can't be D, because water is never actively transported, if active transport is involved, then the movement of water always occurs through osmotic gradients created by the active pumping of ions

Therefore, because the water goes into the cell, then the extracellular environment wouldn't be as moist, so sticky mucus can develop
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