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VCE Biology Question Thread
elfy:
--- Quote from: RaspberryTau on May 29, 2022, 10:24:37 pm ---According to the study design:
Photosynthesis as an example of biochemical pathways
· inputs, outputs and locations of the light dependent and light independent stages of photosynthesis in C3 plants (details of biochemical pathway mechanisms are not required)
· the role of Rubisco in photosynthesis, including adaptations of C3, C4 and CAM plants to maximise the efficiency of photosynthesis
· the factors that affect the rate of photosynthesis: light availability, water availability, temperature and carbon dioxide concentration
Cellular respiration as an example of biochemical pathways
· the main inputs, outputs and locations of glycolysis, Krebs Cycle and electron transport chain including ATP yield (details of biochemical pathway mechanisms are not required)
· the location, inputs and the difference in outputs of anaerobic fermentation in animals and yeasts
· the factors that affect the rate of cellular respiration: temperature, glucose availability and oxygen concentration
I am not that familiar with the updated one... but for the old study-design: we had to know that (eg for aerobic respiration) 1 glucose --> 2 ATP + 2 Pyruvate (glycolysis) --> Krebs cycle ....--> ETC ..... and so on.
So I'd say, u should know the inputs/outputs for each stage (ESPECIALLY ATP YIELD). I think Douchy had a good video explaining it. From checking just now, he's uploaded a bunch more that might be more relevant (eg. https://www.youtube.com/watch?v=th2wwzBNQ1I). Would 100% recommend his podcast as well. (Douchy's Biology)
Hope this helps!
:)
--- End quote ---
Sorry I may have worded it wrong, I was talking about the exact number of molecules for example in the Light Dependant stage of photosynthesis:
inputs: 12H2O, 12NADP+, 18ADP + Pi
outputs: 6O2, 12NADPH, 18ATP
valjaybj :
--- Quote from: elfy on May 30, 2022, 06:40:35 am ---Sorry I may have worded it wrong, I was talking about the exact number of molecules for example in the Light Dependant stage of photosynthesis:
inputs: 12H2O, 12NADP+, 18ADP + Pi
outputs: 6O2, 12NADPH, 18ATP
--- End quote ---
It looks like you already know them haha but for VCAA you won't be asked about the exact number of coenzymes. There are some teachers and online resources that will tell you the numbers but don't worry about them. A summary of what you need to know is the following:
In photosynthesis, you don't need to know the exact number of coenzymes (NADPH and ATP), however it's good to know how much water and oxygen (which you have identified correctly as 6 each); the numbers aren't required in explanations but it's good to be aware of them for the balanced chemical equation.
For cellular respiration however, you do need to know the exact number of ATP made in each stage. Don't worry about the other coenzymes (NADH/FADH2). Just know you make 2 ATP in glycolysis, 2 ATP in the Krebs Cycle and 26-28 ATP in the ETC.
Other than that just know that in glycolysis we have 1 glucose which is converted into 2 pyruvates.
Then in the linking reaction 2 pyruvate is converted to 2 acetyl coA. 6CO2 is released here.
In the ETC we have 6O2 coming in and 6H2O leaving.
Hope this helps
successismygoal:
Hey guys!
(im not sure if this is the right place to post questions about scientific method, pls redirect me if thats not the case)
I had a question about repeatability and reproducibility, which have replaced reliability from the old study design.
So from my understanding, repeatability is how close measurements are if repeated in the same conditions with the same method and same experimenters and same equipment, and reproducibility is how close measurements are if an experiment is repeated in different conditions, such as different location, experimenters or equipment.
So if we were asked to comment on the repeatability of an experiment, could we basically say that any experiment is repeatable, because if you do the exact same thing as you initially did under the same conditions, then you would get the same results?
What about reproducibility? If you only conducted an experiment once, could you say that the reproducibility cannot yet be determined, as the experiment was not repeated under different conditions?
Thanks!
Chocolatepistachio:
Repeatability assess precision- comparison of set of results between two or more repeats of the experiment ( same time and same person). Reproducibility assess accuracy. Reproducibility- comparison of set of results between two or more repeats of the experiment (different time frame or person).
so yea if you only did the experiment once the reproducibility cannot be determined and the repeatability you cant really comment on either if you haven't done the experiment 2 or more times to compare results. I don't think you can say any experiment is repeatable
if it was same conditions you still may not get the same results due to error
successismygoal:
Thank you!
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