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March 29, 2024, 02:33:52 am

Author Topic: VCE Biology Question Thread  (Read 3570647 times)  Share 

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grannysmith

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Re: VCE Biology Question Thread
« Reply #1245 on: March 25, 2014, 07:00:30 pm »
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if i had a graph of products produced vs time with an obvious saturation point
and i increased the amount of substrate, but still had the same amount of enzyme, would i produce a greater amount of product?
also, if i halved the amount of enzyme, but kept the same amount of substrate, would i produce less product ?
1. Yes, because it's measuring the amount of product produced, which would continue to increase over time.
2. You would produce less product within a given time, as the rate at which they are produced would be less (half the amount of enzymes)

soNasty

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Re: VCE Biology Question Thread
« Reply #1246 on: March 25, 2014, 07:12:41 pm »
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1. Yes, because it's measuring the amount of product produced, which would continue to increase over time.
2. You would produce less product within a given time, as the rate at which they are produced would be less (half the amount of enzymes)

there goes 2 marks -.-

nerdmmb

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Re: VCE Biology Question Thread
« Reply #1247 on: March 25, 2014, 07:29:31 pm »
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Why are non-germinating peas used in the cellular respiration practical activity?

Do dry peas even respire?

Tyleralp1

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Re: VCE Biology Question Thread
« Reply #1248 on: March 25, 2014, 10:21:53 pm »
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I'm going to assume is due to the fact they haven't developed sufficient leaves to be photosynthesising. Therefore, you can monitor the Carbon Dioxide concentration, without interference of the amount being consumed for Photosynthesis.

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soNasty

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Re: VCE Biology Question Thread
« Reply #1249 on: March 26, 2014, 06:14:16 pm »
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hey everyone i just wanted to make sure that this diagram is right in terms of photosynthesis + respiration with the presence of oxygen

katiesaliba

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Re: VCE Biology Question Thread
« Reply #1250 on: March 26, 2014, 07:48:05 pm »
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What molecules go through carrier proteins and protein channels? I can't seem to find a list of the specific molecule types. 
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PB

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Re: VCE Biology Question Thread
« Reply #1251 on: March 26, 2014, 07:51:10 pm »
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Na+, K+, Glucose... basically anything that is non lipid and hence, cannot pass through the phospholipid membrane.
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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #1252 on: March 26, 2014, 09:15:51 pm »
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How does apoptosis involve signal transduction? Is just that the cell gives the signal for the cell to be destroyed and that there is a cascade of events that follow this? (caspase enzymes are activated, DNA in the nucleus and organelles (mitochondria) are digested, the cell shrinks, blebs form on the cell membrane, phagocytes engulf the cell remnants etc). Would the response be that the cell is destroyed?
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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #1253 on: March 26, 2014, 09:19:56 pm »
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Also, do we need to know anything about homeostasis and negative/positive feedback systems? Apparently they have been removed from the study design but I just want to be 100% sure :P
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grannysmith

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Re: VCE Biology Question Thread
« Reply #1254 on: March 26, 2014, 09:37:08 pm »
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How does apoptosis involve signal transduction? Is just that the cell gives the signal for the cell to be destroyed and that there is a cascade of events that follow this? (caspase enzymes are activated, DNA in the nucleus and organelles (mitochondria) are digested, the cell shrinks, blebs form on the cell membrane, phagocytes engulf the cell remnants etc). Would the response be that the cell is destroyed?
Yeah, the eventual response is cell death

katiesaliba

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Re: VCE Biology Question Thread
« Reply #1255 on: March 26, 2014, 10:28:24 pm »
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Ah sorry let me rephrase, what type of molecules pass through carrier proteins? And what type of molecules pass through protein channels?
Protein channels deal with ions and hydrophilic molecules I'm fairly sure, but carrier proteins can transport ions too, right?

EDIT:
Is this correct?-

CHANNEL PROTEINS-
-pores-large molecules (always open)
-gated protein channel (ions). SELECTIVE.

CARRIER PROTEINS-
-VERY SPECIFIC
-large polar molecules and some ions. (e.g. Glut-1)
« Last Edit: March 26, 2014, 10:38:37 pm by katiesaliba »
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Re: VCE Biology Question Thread
« Reply #1256 on: March 27, 2014, 12:48:09 pm »
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Anyone got tips for doing an experimental design? It's part of my Enzyme SAC tomorrow and I just know some basic requirements such as control, variables, large sample cells, hypothesis. What else do I need and any tips for getting a nice set of mark of these types of question?
Thank you!
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vox nihili

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Re: VCE Biology Question Thread
« Reply #1257 on: March 27, 2014, 02:47:47 pm »
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Ah sorry let me rephrase, what type of molecules pass through carrier proteins? And what type of molecules pass through protein channels?
Protein channels deal with ions and hydrophilic molecules I'm fairly sure, but carrier proteins can transport ions too, right?

EDIT:
Is this correct?-

CHANNEL PROTEINS-
-pores-large molecules (always open)
-gated protein channel (ions). SELECTIVE.

CARRIER PROTEINS-
-VERY SPECIFIC
-large polar molecules and some ions. (e.g. Glut-1)

The channel protein stuff isn't really right. Channel proteins can be gated for large molecules as well. In fact, nearly all channel proteins are gated to be honest.

Carrier proteins is fine though
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chekside

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Re: VCE Biology Question Thread
« Reply #1258 on: March 27, 2014, 04:16:06 pm »
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Hey, I was just wondering if anyone could help me with the following question,
'Explain what is meant by the active site of an enzyme and relate it to the enzyme's tertiary structure'
I understand the first part, but I'm not too sure how to relate it to the tertiary structure.

grannysmith

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Re: VCE Biology Question Thread
« Reply #1259 on: March 27, 2014, 04:27:14 pm »
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Hey, I was just wondering if anyone could help me with the following question,
'Explain what is meant by the active site of an enzyme and relate it to the enzyme's tertiary structure'
I understand the first part, but I'm not too sure how to relate it to the tertiary structure.
The tertiary structure largely determines the function of the protein (it's the functional conformation). The tertiary structure of an enzyme determines its active site, which in turn determines the specific substrates to which it binds to.