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March 29, 2024, 09:30:52 am

Author Topic: VCE Biology Question Thread  (Read 3571010 times)  Share 

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darkz

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Re: VCE Biology Question Thread
« Reply #12615 on: June 15, 2020, 09:01:41 pm »
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For an experiment testing the rate of cellular respiration with different concentrations of glucose, where the rate was measured by the volume of bubbles produced, would the dependent variable be the rate of cellular respiration, or the volume of bubbles produced? I'm just a little confused whether it should be the actual biological process or the thing observed.

Well, the dependent variable will be what you're measuring, which in this case sounds like the volume of bubbles produced. The rate of cellular respiration is an interpretation of the data - as you're using the volume of bubbles produced to calculate the rate.
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GodNifty

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Re: VCE Biology Question Thread
« Reply #12616 on: June 15, 2020, 10:26:34 pm »
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For the definition of osmosis.

Osmosis is the movement of water molecules across a semi permeable membrane from an area of high concentration to an area of low concentration.

Do you have to say net movement

Does anaerobic respiration occur in the cytoplasm or cytosol and would it be wrong if you said cytoplasm.

Do Only muscle cells undergo lactic acid fermentation ?
Osmosis is the net movement of water from a low concentration of solute to a higher one.
Anaerobic respiration occurs in the cytosol. Don't think it's wrong to say cytoplasm but cytosol is better.
Muscle cells aren't the only ones that undergo lactic acid. Red blood cells lack mitochondria, thus it must undergo anaerobic respiration.

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12617 on: June 16, 2020, 01:30:18 am »
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For this question
Streptococcus preminoae is a bacterium that causes pneumonia a serious respiratory disease. When penicillin was first used as an antibiotic to treat infections with this bacterium, most of the bacteria were killed. Drug companies began mass producing penicillin in 1943. Four years later most strains of this bacterium were resistant to penicillin. This is regarded as an example of evolution by natural selection. For natural selection to have occurred which of the following must have been true.
A the size of the bacterial populations had significantly increased after 1943
B after 1943 the bacteria evolved new mechanisms for breaking down penicillin
C heavy use of penicillin after 1943 caused mutations in the bacteria
D  some bacteria had a gene enabling penicillin resistance before 1943

Would it be c?

darkz

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Re: VCE Biology Question Thread
« Reply #12618 on: June 16, 2020, 08:18:10 am »
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For this question
Streptococcus preminoae is a bacterium that causes pneumonia a serious respiratory disease. When penicillin was first used as an antibiotic to treat infections with this bacterium, most of the bacteria were killed. Drug companies began mass producing penicillin in 1943. Four years later most strains of this bacterium were resistant to penicillin. This is regarded as an example of evolution by natural selection. For natural selection to have occurred which of the following must have been true.
A the size of the bacterial populations had significantly increased after 1943
B after 1943 the bacteria evolved new mechanisms for breaking down penicillin
C heavy use of penicillin after 1943 caused mutations in the bacteria
D  some bacteria had a gene enabling penicillin resistance before 1943
Would it be c?

No, penicillin use cannot cause mutations in the bacteria. Rather, natural selection is based on the notion that pre-existing traits are selected for in a population under a selection pressure which makes them more favourable and therefore more resistant to the selection pressure. i.e. if we have a population of bacteria with no selection pressure (without penicillin), then penicillin resistance would not be selected for as there is no advantage of having it. However, if we introduce a selection pressure (penicillin), then those bacteria who already had penicillin resistance would survive and pass it down to their descendants while those without would die. I won't specifically tell you the answer, but I've given you more than enough information to determine the answer.
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12619 on: June 16, 2020, 12:21:54 pm »
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Would it be d

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12620 on: June 16, 2020, 12:25:25 pm »
+1
For this question:
Two proteins actin and myosin are responsible for the contraction of muscles. Cellular extracts of these proteins will contract in a Petri dish in the presence of certain mineral ions. However this only occurs if a certain molecule is also present. This is
A adp
B Glucose
C nad
D  atp
Would it be glucose? Because glucose is involved with lactic acid fermentation. Anaerobic respiration.

darkz

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Re: VCE Biology Question Thread
« Reply #12621 on: June 16, 2020, 02:13:21 pm »
+1
Would it be d

Yes

For this question:
Two proteins actin and myosin are responsible for the contraction of muscles. Cellular extracts of these proteins will contract in a Petri dish in the presence of certain mineral ions. However this only occurs if a certain molecule is also present. This is
A adp
B Glucose
C nad
D  atp
Would it be glucose? Because glucose is involved with lactic acid fermentation. Anaerobic respiration.

Well yes, glucose can be used to make energy, but what do you need to make energy from glucose? Where does this normally take place? In the scenario, you're only told that the proteins are present as well as 'mineral ions'. 
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12622 on: June 16, 2020, 02:57:20 pm »
0
Atp?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12623 on: June 16, 2020, 03:11:25 pm »
0
For this question:
Which of the following is a major cause of the size limits for certain types of cells?
A the evolution of eukaryotic cells after prokaryotic cells
B the differences in the structure of prokaryotic and eukaryotic plasma membranes
C the evolution of larger cells followed that of smaller cells
D the need for a large surface area to volume ratio to enable efficient membrane transport

Would it be d?

darkz

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Re: VCE Biology Question Thread
« Reply #12624 on: June 16, 2020, 03:14:18 pm »
+1
Atp?

Yes, it would be ATP

For this question:
Which of the following is a major cause of the size limits for certain types of cells?
A the evolution of eukaryotic cells after prokaryotic cells
B the differences in the structure of prokaryotic and eukaryotic plasma membranes
C the evolution of larger cells followed that of smaller cells
D the need for a large surface area to volume ratio to enable efficient membrane transport

Would it be d?

Yes
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12625 on: June 16, 2020, 03:19:54 pm »
0
For this question:
Explain the role of differentiation in a multicellular organism.

Is this correct:
Each cell has the potential code to change into different cell types(determines specialisation in structure and function). Differentiation maintains the health of an organism by ensuring complex functions are coordinated and controlled.

Do all cells both prokaryotic and eukaryotic have cytosol and cytoplasm.

Why do some websites say co2 is involved with photolysis of water?

GodNifty

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Re: VCE Biology Question Thread
« Reply #12626 on: June 16, 2020, 08:54:39 pm »
+3
For this question:
Explain the role of differentiation in a multicellular organism.

Is this correct:
Each cell has the potential code to change into different cell types(determines specialisation in structure and function). Differentiation maintains the health of an organism by ensuring complex functions are coordinated and controlled.

Do all cells both prokaryotic and eukaryotic have cytosol and cytoplasm.

Why do some websites say co2 is involved with photolysis of water?
1. Multicellular organisms need different types of cells in order to function - for example, the anatomical structure of a neuron is adapted to its function (to transmit electrical impulses), so you wouldn't see a neuron in a heart because it is not adapted to cardiac function.
2. Looks right, yeah.
3. Yep. Cytosol is the liquid part of the cell, cytoplasm is the liquid part + organelles (minus nucleus)
4. ? I don't think so. Photolysing means you're breaking apart the water molecule into hydrogen ions and oxygen gas. Water doesn't even have carbon.

makram

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Re: VCE Biology Question Thread
« Reply #12627 on: June 16, 2020, 10:37:29 pm »
0
Broad question, but arguably the most important:

How do you improve in answering questions? As in, how can you answer your questions in a way where the examiner will give you full marks? The examiner's reports are the best resource available, but it is very difficult to emulate their concise writing style for every question. Any tips for this?

Also, with questions where they ask 'suggest 2 ways ...', especially in recent experimental design questions, how can I always gain marks for my suggestion/ can there be other answers that are not included on the examiner's report?

Sine

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Re: VCE Biology Question Thread
« Reply #12628 on: June 16, 2020, 11:01:59 pm »
+3
Broad question, but arguably the most important:

How do you improve in answering questions? As in, how can you answer your questions in a way where the examiner will give you full marks? The examiner's reports are the best resource available, but it is very difficult to emulate their concise writing style for every question. Any tips for this?

Also, with questions where they ask 'suggest 2 ways ...', especially in recent experimental design questions, how can I always gain marks for my suggestion/ can there be other answers that are not included on the examiner's report?
To improve answering is kind of a broad question but I think getting better at interpreting exactly what the examiner wants helps a lot. This obviously comes with practice. This allows you to know exactly what keywords you need to use to receive full marks.

Generally, the examiner's report is just some acceptable answers. Not all the answers that were accepted that year are included in the examiner's report. Coming from a past assessor they say that they have an answer key to mark student's answers but if the student writes something that makes sense but is not on the answer key they still give them the marks.


Bri MT

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Re: VCE Biology Question Thread
« Reply #12629 on: June 16, 2020, 11:28:01 pm »
+2
Why do some websites say co2 is involved with photolysis of water?

Is it possible you were looking up photosynthetic bacteria? That could explain this.

Note to readers: you don't need to worry about this for your VCE. VCAA isn't expecting you to talk about acid or carbon monoxide based photosynthesis.