Hielly's biology questions!!

[beezy4eva]

1)A buffer is a substance that maintains  pH levels due to the ability to act as either an acid or a base. In an amino acid, the carboxy group is able to act as an acid and donate a H+. The amino group is able to act as a base and accept a H+

2) Proteins can be good for contractile roles, depending on their structure. Since a lot of them have structures held by fairly weak hydrogen bonds that can break and reform(like in alpha helices) they can stretch and contract.

3)I think they want more of an explanation of how denaturation changes shape and hence active site, ect.

[Hielly]

Thanks,

what are the special characteristics of light produced by a synchroton?
i wrote. The synochroton has a great intensity of light, this allows examinations of molecular structure in much finer detail.

This is only one characteristic, the question asks for more. (the plural at the end of characteristics)

thanks!

[NE2000]

Thanks,

what are the special characteristics of light produced by a synchroton?
i wrote. The synochroton has a great intensity of light, this allows examinations of molecular structure in much finer detail.

This is only one characteristic, the question asks for more. (the plural at the end of characteristics)

thanks!

You do not need to know about synchotrons for Unit 3/4 Biology

[Hielly]

i came across it, it's a question i had to do for homework.

[jackinthepatch]

i came across it, it's a question i had to do for homework.

Really? I don't think we have to know about them...but I wouldn't say I'm 100% sure lol. Hopefully we don't.

[Hielly]

yeps it was the first few questions of the textbook

[jackinthepatch]

yeps it was the first few questions of the textbook

Ah well I wouldn't worry about it too much. You'll go over it in class anyway if it turns out to be important.

[NE2000]

ah well I didn't go over it in class last year, as far as I know it's not on the study design but I could be wrong...

[shinny]

yeps it was the first few questions of the textbook

Was this from Nature of Biology? Alot of stuff in there is irrelevant...

[Hielly]

Yups nature of biology

[Hielly]

Heyss,
i've been doing extra work in the nature of biology book, and i finshed the chapter reveiw but came across 6 questions i didnt get. The questions are in the attachement.

THANKS

[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.

[Hielly]

"1.a. Spider silk is made from protein, so hence the monomers would be amino acids.
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."
About these 2 answers, i would have never got it. How did you knwo spider silk is made from protein?.. i've looked in the textbook and doesnt seem to say it. Also Cysteine has sulfur in it? :|,
Are both these questions common sense ? :S:S

[shinny]

It is stated that spider silk is folded into beta pleated sheets, and from this, you can infer that it is made from protein as only proteins have this type of molecular structure.

I'm actually not quite sure if the fact that cysteine is the only amino acid which contains sulfur is presumed knowledge or not, but it's a fact that I learned early on, and spare yourself the trouble of finding out whether or not you need to know it and just remember it. I remember doing a few questions which tests this fact so yeh, just keep it in mind.

[WhoTookMyUsername]

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?