VCE Biology Question Thread

[Frozone]

My class just started talking about pathogens today.

Wow your class must be extremely ahead. We were discussing hormones.

[alchemy]

My class just started talking about pathogens today.

Same  (:

[MM1]

Just curious, can someone please explain what the 'pins and needles' sensation is that occurs in the body and how that relates to the stimulus-response mechanism? Thanks!

[vox nihili]

Just curious, can someone please explain what the 'pins and needles' sensation is that occurs in the body and how that relates to the stimulus-response mechanism? Thanks!

Ok, silliness aside, it's caused because the nerves start to get a deprived of resources and start doing funny shit. There are actually a number of causes for pins and needles, and as far as I'm aware, it's not actually that well understood.

[MM1]

(Image removed from quote.)

Ok, silliness aside, it's caused because the nerves start to get a deprived of resources and start doing funny shit. There are actually a number of causes for pins and needles, and as far as I'm aware, it's not actually that well understood.

Aha, cool thanks

[katiesaliba]

With hormones, can they stay attached to membrane receptors if they're not catabolised by enzymes, thus sustaining their influence?
Also, how are excess hormones in blood inactivated?

[RazzMeTazz]

Could the light-dependent reactions overall be considered exergonic and the light-independent reactions overall be considered endergonic?

[katiesaliba]

How would responses differ given the frequencies of impulses? Would stronger stimuli employ reflex arches?

[vox nihili]

With hormones, can they stay attached to membrane receptors if they're not catabolised by enzymes, thus sustaining their influence?
Also, how are excess hormones in blood inactivated?

In theory yes, but that would defeat the purpose of hormones. There are stimuli that actually do that, that is, act constitutively, but at the same time, it's not how hormones would behave.

Degraded by other enzymes, inhibited by inhibitors etc

[katiesaliba]

Do neurons contain only 1 type of neurotransmitter so that they are either excitatory or inhibitory?

[vox nihili]

Do neurons contain only 1 type of neurotransmitter so that they are either excitatory or inhibitory?

Yes

[Rishi97]

Can someone please explain apical dominance in easy terms?

[howlingwisdom]

Can someone please explain apical dominance in easy terms?

Apical dominance is basically when lateral buds of a plant are unable to grow. This is because (IAA a type of auxin) found at the tip of plants diffuses down the phloem and exerts an inhibitory effect on the lateral buds. When this source of auxin is removed, apical dominance can no longer occur and hence the lateral buds are able to grow.

[alchemy]

What hormone would cause lateral bud growth?

[alchemy]

What is the name of the actual molecule that binds to a protein receptor on the membrane OR receptor in the cytosol to ultimately trigger the production of insulin?
This question has been in my head for a long time.