VCE Biology Question Thread

[Yacoubb]

Thank you!!

No worries!!

[godsonsamuel888]

Can someone help me with this question!!

I got B as the answer. But the solutions states C as the correct answer.

[Yacoubb]

Can someone help me with this question!!

I got B as the answer. But the solutions states C as the correct answer.

That's weird :/ Are there any explained solutions with the answer?

[The Usual Student]

Can someone help me with this question!!

I got B as the answer. But the solutions states C as the correct answer.

IMO it is also B
but maybe when they say cross over in 'two places" they mean two places cross over and hence it is only one cross over that is occurring
Cause two things crossing over is the same as cross over occurring at two places

[godsonsamuel888]

That's weird :/ Are there any explained solutions with the answer?

Thats what the explanation says.

[Yacoubb]

Thats what the explanation says.

Look tbh this is a typical NEAP question where it's in too much depth that is totally unnecessary!

[thuynh]

Does any have any tips for reading time? And checking over answers? I seem to never see the trick questions...

[The Usual Student]

I read in the connect notes that all polypeptides start with methionine? but in class apparently the start codon does not code for an amino acid but just indicates where to start?
can someone explain?

[Yacoubb]

I read in the connect notes that all polypeptides start with methionine? but in class apparently the start codon does not code for an amino acid but just indicates where to start?
can someone explain?

The start codon (AUG) does in fact code for the amino acid methionine, in addition to starting translation. It is the stop codon that doesn't code for an amino acid.

[Yacoubb]

Does any have any tips for reading time? And checking over answers? I seem to never see the trick questions...

My biggest tip for the 15 mins of reading time is to allocate at least 10 mins (I believe I even dedicated around 12 mins) to actually going through the short answer questions. In this time, you can begin to formulate your answers, and know the direction you'll be going in to answer the questions by setting up pointers (e.g. what you will have in your answer, key words to mention, etc.) The remaining time you can use to start answering MC questions.

[hodang]

Can someone please explain the process of protein synthesis using the organelles

Nucleus - Ribosome - rough ER - Golgi - secretory vesicles

Do protein synthesis occur in ribosomes or rough ER? I don't want to be contradictory here just making sure

[hodang]

Do the antibodies used to fight infection remain attached to b memory cells? Or is this untrue

[geminii]

Do protein synthesis occur in ribosomes or rough ER? I don't want to be contradictory here just making sure

Protein synthesis occurs in the ribosomes, which are located in the rough ER. So its correct to say ribosomes and not rough ER.

[Yacoubb]

Do the antibodies used to fight infection remain attached to b memory cells? Or is this untrue

Memory B cells that are produced are very similar to the naive B cells which are used to activate them. They differentiate from the B-cells after the rapid multiplication of the B-cells in clonal expansion. They are then present in the serum, so that if you the same antigen is to bind to the memory B-cell surface immunoglobulins, you'll generate a more rapid and robust immune response, with a higher antibody concentration.

Protein synthesis occurs in the ribosomes, which are located in the rough ER. So its correct to say ribosomes and not rough ER.

Protein synthesis occurs in the ribosomes and the function of the rough ER is to synthesise and transport proteins within the cell. To be honest, if it's one mark, I would say ribosome (for intracellular proteins) or rough ER (for extracellular proteins). But if I had to elaborate on it, I would say "ribosomes on the rough ER".

[vox nihili]

Can someone help me with this question!!

I got B as the answer. But the solutions states C as the correct answer.

C is definitely the answer here.

Really difficult to explain without a diagram, so have a look at this one and see if you can make sense of it: