VCE Biology Questions Thread

Taaaa76
According to the Edrolo textbook these are the organelles you need to know for the direct production, transport, modification and eventual secretion of a protein:

1. Ribosome - site of protein synthesis
2. Rough Endoplasmic Reticulum - involved in initial folding of protein and transport to Golgi Body
3. Transport Vesicle - transports protein to Golgi body.
4. Golgi Body - Modifies proteins and then packages them into vesicles.
5. Secretory Vesicle - Transports proteins around the cell and fuses with plasma membrane to secrete proteins into the extracellular environment.

There are other organelles indirectly required for this process like mitochondria that produces ATP for the process but since it is not directly involved you are not required to write this is your answer. Hope this helps!

abbey1234321 okay thanks for letting me know

abbey1234321
Yea i looked over at it and I am pretty sure it says during the day, which is weird. Mistake maybe?
Which practise exam have you done it on?
Mine was from NEAP

abbey1234321 got it, thanks!

I have yet ANOTHER question lol:
Which one of the following would be a good source of biomass for the process of ethanol production?
A. Animal manure
B. Bacteria cultures
C. Yeast cultures
D. Wood pulp
I put C because yeast fermentation results in ethanol, but the answer is D somehow can someone explain?

Taaaa76
I was doing the same practise exam yesterday (neap 2022) ahaha.

So biomass is plant or animal material that can be sourced from various industries that have carbon rich compounds that glucose and other sugars can be extracted from. The biomass itself is the source of glucose and sugars as an input for fermentation. Then to produce bioethanol, Yeast is added to this biomass after it has been broken down to anaerobically ferment and produce ethanol as an output.
Therefore C would be incorrect because it cannot provide sugars and glucose for anaerobic fermentation. Although, I can see why you went with this answer.
D is the correct answer because wood pulp contains cellulose, which be broken down to produce glucose.
if this is still confusing or u have another question feel free to ask

Hi, i got this question in a practise exam:
Explain why RNA must be converted to DNA in RT-PCR
2 mark question.

abbey1234321 nope, it makes sense. Thanks!

Is RT-PCR on the study design??

Taaaa76 this was a question from the 2022 biology exam. It is on the study design I think.

Hi, I have a question on meiosis, when describing how it can increase genetic diversity. Is recombination the same as like crossing over and independent assortment? What would be the difference if they aren't?

A sample answer I found to this question I was doing said, "The genetic material is transferred between homologous chromosomes during recombination"

_sophiestudies_ That makes so much sense, thank you!

Does anyone know what biological implications mean? Such as when they ask for a biological implication about GMOs. I am struggling to find out what the term actually refers to. Thanks!

abbey1234321 This might help.

Biological implications = What impact does this change or technology have on biological systems and processes

Below includes pros and cons for GMOs

Pros:

• GM crops usually have better crop productivity than non-GM crops, meaning more food can be grown using less land, reducing habitat loss due to land clearing
• Insect-resistant GM plants require fewer pesticides, which is better for the environment
• GM foods can be made to have improved nutritional content, improving the health of individuals that consume them.

Cons:

• GM crops may lose their effectiveness if weeds or pests evolve resistance to them
• Loss of genetic diversity within crop populations due to a lack of genetic variation when GM crops are widespread
• Cross-pollination between GM crops and wild species or weeds may cause genes to spread and an have negative consequences on organisms (e.g. could damage them or reduce their fitness)

_sophiestudies_
Thank you so much!

I had trouble with a question:
Carbon Dioxide is one if the products of cellular respiration that needs to be carried from the tissue to the lungs where gas exchange occurs. It mainly transported in the blood:
A) bound to haemoglobin
B) as carbonic acid in solution
C) as bicarbonate ions in plasma
D) associated with enzyme cytochrome c

I never learned about this, is this a question that could come in the exam?

I also had trouble with another question:

Which of the following events will not occur after infection by a virus?
A) release of interferon
B) release of complement
C) apoptosis in host cell
D) increase in the production of lymphocytes

I need help for once again, another question:

Eukaryotic cells have a single circle of mitochondrial DNA consisting of approximately 16.5 kilobases. Mitochondrial DNA is useful in establishing evolutionary relationships between individuals because:
A) it is only present in female gametes
B) recombination occurs at a regular rate
C) it is present in smaller amounts than nuclear DNA
D) substitution mutations occur at a greater rate than nuclear DNA
The answer is B and I have no idea why