Hielly's biology questions!!

[shinny]

1.a. Spider silk is made from protein, so hence the monomers would be amino acids.
b. Secondary (Should know from rote learning)
c. It is of great importance because the beta-folding allows the silk to be strong and allow the spiders to catch prey without them escaping.
2. It'd have to be the molecular formula of cysteine. Cysteine is the only amino acid to have sulfur in it, and so is the only one involved in the creation of di-sulfide bridges.
3. It's a carbohydrate. Straight forward definition question.
4. Everyone hates this question and I doubt you'll be asked it on the exam as it shows no biology understanding whatsoever. It's literally a jigsaw puzzle. Just join the common overlapping sections and you'll get

X-gly-met-cys-ser-cys-his-pro-arg-cys

Note: Yes I know it says nine amino acids, but it was pretty much agreed upon in my year that that was a typo.
5. a. No. There are a few different types of RNA (mRNA, tRNA, ribosomal RNA etc) and it's impossible to determine which type it is without further information.
b. Yes, as it is now possible to state that it is mRNA as only mRNA codes for the creation of amino acids.

Doesn't methionine have sulfur? (though it can't form disulphide bonds and is only a precurser to cysteine?

Yep, made an error there. As I said in response to one of your own more recent posts, both of them do. The only fact I learnt in VCE was that cysteine was the only one which made sulfide bridges, and I incorrectly assumed that meant it was the only one with sulfur.

[Russ]

I suppose it should also be said that methionine is not just a precursor to cysteine, but this thread is 2 years old so I doubt it matters.

[WhoTookMyUsername]

I suppose it should also be said that methionine is not just a precursor to cysteine, but this thread is 2 years old so I doubt it matters.

Methionine is also a 'start' amino acid?

[Russ]

Yeah that's the major other purpose, but it's also important for various other pathways

[pi]

I suppose it should also be said that methionine is not just a precursor to cysteine, but this thread is 2 years old so I doubt it matters.

Methionine is also a 'start' amino acid?

This is more Unit 4 knowledge