swag_sxc_boi's Bio 3/4 question thread

[swagsxcboi]

1) do we need to know the function of gyrase?
if yes, how would I best define it?

2) In a VCAA exam, should I write that restriction enzymes break both phosphodiester bonds and hydrogen bonds?
or stick to just phosphodiester bonds?

thanks in advance

[vox nihili]

1) do we need to know the function of gyrase?
if yes, how would I best define it?

2) In a VCAA exam, should I write that restriction enzymes break both phosphodiester bonds and hydrogen bonds?
or stick to just phosphodiester bonds?

thanks in advance

1. Never heard of a gyrase, so I'm going to say no at this point. (Edit: after some googling, answer becomes a definite no)

2. Phosphodiester, that's what they act on.

[psyxwar]

2. Phosphodiester, that's what they act on.

dogged by the bio faculty again

[swagsxcboi]

dogged by the bio faculty again

standard Mulholland   

[swagsxcboi]

1. Never heard of a gyrase, so I'm going to say no at this point. (Edit: after some googling, answer becomes a definite no)

2. Phosphodiester, that's what they act on.

Thank you t-rav!

[vox nihili]

dogged by the bio faculty again

Look, to be quite honest it's probably worth mentioning that the base pairing is broken when they give rise to sticky ends. In fact, it is definitely worthwhile mentioning that, otherwise you'll have a difficult time explaining how they work. That said, the enzymes specifically act on the phosphodiester bonds. The hydrogen bonds are broken as a result though.

[simpak]

I learnt what gyrase was in VCE but I never learnt the term topoisomerase until university.
I would know that gyrase works ahead of the fork to 'release tension' at least.

[swagsxcboi]

what are the differences between plant cell mitosis and animal cell mitosis?

[Yacoubb]

what are the differences between plant cell mitosis and animal cell mitosis?

[Edit]: Just note that plant cells do not have centrioles, while animal cells do.

In cytokinesis, a cleavage furrow forms to separate the two daughter animal cells following mitosis. However, in plant cell cytokinesis, a cell plate, laden with golgi vesicles, eventually forms the cell wall that is deposited over the plasma membrane of plant cells.

[swagsxcboi]

Centrioles form the spindle fibres during prophase in animal cell mitosis, whereas centrosomes form the spindle fibres in plant cell mitosis. In cytokinesis, a cleavage furrow forms to separate the two daughter animal cells following mitosis. However, in plant cell cytokinesis, a cell plate, laden with golgi vesicles, eventually forms the cell wall that is deposited over the plasma membrane of plant cells.

what about centrosomes in animal cell mitosis?

[Yacoubb]

what about centrosomes in animal cell mitosis?

Yeah I misunderstood something. I edited my post.

[swagsxcboi]

what is the best definition for phenotype?

[vox nihili]

what is the best definition for phenotype?

From my dictionary: total appearance of an organism, determined by interaction between its genotype and the environment.

Note that it's actually a dictionary of Biology (cool hey?).

[Yacoubb]

what is the best definition for phenotype?

Phenotype refers to the physical, biochemical, physiologicl or behavioural expression of a particular trait1, determined by both the genotype of the trait and environmental factors.

[swagsxcboi]

Could someone please explain PCR in full depth?
My teacher's notes are confusing