VCE Biology Questions Thread

lune777 yeahh its not good for there breathing

sarah99 it doesnt always have to happen naturally I mean scientist and researches or anyone really do experiments relating to this stuff so like people can conduct experiments for plants and give it like a specific amount of O2 or CO2 just to measure the rate of cellular respiration or photosynthesis and look at what exactly is happening. BUT NATRUALLY like plants that are not put in experiments yes they need CO2 and O2 from the environment to survive. and yes they do release O2 from photosynthesis to the environment OR they can use it for cellular respiration and they also release CO2 from cellular respiration into the environment BUT they can also use it for photosynthesis. and YES plants take in O2 just like us to eventually produce ATP and they also take in CO2 to produce glucose.

hi, just had a question about the trp operon. So there's a question that asks for the impact of a nonsense mutation in the trpR gene. The answer says that there would be continuous production of tryptophan. But wouldn't attenuation still occur to prevent transcription completion and limit trp production?

guys this has nothing to do with what you guys are talking about, but since i have a passion for biology, do you guys spend time on human anatomy and bodily functions? Could anyone give me a short lists of the subtopics learnt in vce biology? Thanks

MMHS in unit 3/4 bio, we cover aerobic and anaerobic cellular respiration, immunity, enzymes, factors that affect enzymes, protein structure and function, nucleic acids, gene expression (transcription, translation, post-transcriptional modifications, post-translational modifications) and regulation (components of a gene, regulatory genes and structural genes), the protein secretory pathway and mutations (point and block).

In unit 1/2 bio, we cover cells, apoptosis, the plasma membrane, the digestive system, the excretory system, the endocrine system, homeostasis (including regulation of body temp, blood glucose and water balance as well as malfunctions), and fundamental genetics such as genes and chromosomes, mitosis and meiosis, and chromosomal abnormalities.

Novahkiin thank you!

Novahkiin Oh okay, thanks for the detailed response! And it was 4m, given an image of the operon.
Marking guide:
2m-definition of nonsense mutation & that it results in a shortened, non-functional protein.
1m-repressor can't bind to operator.
1m-continuous production of tryptophan.
So the final impact is just worth the last mark, which makes sense if it's just abt repression like you said bc if we had to say attenuation still occurred there would prolly be another mark for that. Thank you for your help!

does anyone know if we need to know anything about lymphatic system containing ducts. or like we don't need to know that

Yeah, my brother said you need to know that for SACs in biology

lune777 The line between both is quite blurry… I think you can use guide RNA and single guide RNA interchangeably… but it depends on what you are talking about specifically.

Random_Person_You_Happen_To_Be_Encountering_Now But I think gRNA would be more suitable

Hi everyone!! When talking about the light independent stage, are there steps we need to have memorised or just the inputs and outputs. Also, to what depth do we need to know CRISPR-Cas9. I’m a bit overwhelmed with all the info.

Hi everyone! Do we need to know the exact quantities of the inputs and outputs for each stage of photosynthesis and cellular respiration?

Mango I am pretty sure we just need to know the names of the co-enzymes, but the quanities of everything else is needed (thats what ive been told anyways)

Also i think a general idea of what happens in the light independant stage is useful for understanding and how that differs in C3 C4 and CAM.

CRISPR - Cas9 i recomend knowing as much as possible but probs more specifically how it works how scienctists use it and like benifits/bioethics. so like all of it the exams love CRISPR D: so maybe look on those also

lune777 so when mentioning gRNA or sgRNA When it is working naturally in bacteria you would say gRNA (that's when its acting as an adaptive immune system against invading pathogens) but when its used for gene editing for example in plants you would say sgRNA because its the sgRNA is synthetically made in labs. Hope that made sense

Mango If you look at past exams they always like to throw in questions about the inputs and outputs of both photosynthesis and cellular respiration

S007 I think also more than anything one of the bio tutors on atar notes said to like memorise model answers so just look through vcaa questions that are about CRISPR for example and just memorise the way they want the process to be said for example look at the citrus canker question from the 2023 biology exam I think it'll be helpful to try it out and then look at the answer and kind of get the gist of the way they want you to explain the process