VCE Biology Question Thread

[katiesaliba]

Are conjugated proteins established during their quaternary structure?

[grannysmith]

Are conjugated proteins established during their quaternary structure?

The quaternary structure refers to multiple polypeptide chains joined together. If the conjugated protein is not composed of multiple polypeptide chains, then I would think not.

Are we required to know the functions of different growth regulators (e.g. auxins, gibberellins, ABA etc.)?

[howlingwisdom]

Are we required to know the functions of different growth regulators (e.g. auxins, gibberellins, ABA etc.)?

I think we need to know how auxin functions in depth (what happens during phototropism and geotropism in shoots and roots etc) but our teacher said that we don't need to know that much about the others - perhaps just what their basic functions are.

[jessica666]

Do we need to know about sympathetic and parasympathetic nervous systems??

[Lizzy7]

Do we need to know about sympathetic and parasympathetic nervous systems??

Yes we will have to know about them We will also need to know their functions e.g. Sympathetic nervous system is associated with the body's fight/flight response, getting us ready for threatening situations and the Parasympathetic nervous system is involved in bringing back the stable environment (homeostasis) from the not-so stable effects of the fight/flight response.

[RazzMeTazz]

is the post synaptic membrane a part of another neurone that the electrical impulses  are being transferred to from one neuron?

[RazzMeTazz]

my textbook was talking about the synapse being open or closed.. what does it mean if the synapse is open? just that neutral transmitters are being released from it? what does it mean if it's closed?

[RazzMeTazz]

what are the different types of chemical messages a cell may receive?

[rhinwarr]

is the post synaptic membrane a part of another neurone that the electrical impulses  are being transferred to from one neuron?

Yes but it can also be a different cell like a muscle cell.

[RazzMeTazz]

Yes but it can also be a different cell like a muscle cell.

Thankyouu

[RazzMeTazz]

What is a threshold potential?

And how does this relate to the action potential?

[rhinwarr]

What is a threshold potential?
And how does this relate to the action potential?

The potential difference between the inside of the membrane and the outside required for the neuron to trigger depolarisation for an action potential (opening Na+ and K+ channels) to 'fire' the neuron.

[howlingwisdom]

Elaborating on rhinwarr's answer, an action potential is an all-or-nothing response - so the neuron has to be stimulated beyond threshold for the nerve impulse to be transferred along the axon (this causes the membrane polarity of the axon to be changed as sodium ions move in and potassium ions move out)

[RazzMeTazz]

The potential difference between the inside of the membrane and the outside required for the neuron to trigger depolarisation for an action potential (opening Na+ and K+ channels) to 'fire' the neuron.

Thanks guys!

[howlingwisdom]

Is it the influx of calcium ions into the axon terminal that results in the release of neurotransmitters via exocytosis?


On another subject (well, relating to Biology I guess) any plans for the holidays?