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July 22, 2025, 09:33:03 pm
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Author Topic: Biology Unit 3 Questions Megathread  (Read 117365 times)  Share 

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Drunk

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Re: Biology Questions Megathread
« Reply #165 on: February 27, 2011, 05:40:32 pm »
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how do proteins stabilise pH?
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pi

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Re: Biology Questions Megathread
« Reply #166 on: February 27, 2011, 07:40:43 pm »
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Proteins are polar. When the pH of a solution around them changes, the amino acids in the proteins may either lose or gain a hydrogen ion (H+), to stabalise the pH of the solution.
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Kaille

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Re: Biology Questions Megathread
« Reply #167 on: February 28, 2011, 10:04:05 pm »
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Hi guys, just wondering, can proteins be stored? if so, how?
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shinny

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Re: Biology Questions Megathread
« Reply #168 on: February 28, 2011, 10:05:11 pm »
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Quote from: Kaille on February 28, 2011, 10:04:05 pm
Hi guys, just wondering, can proteins be stored? if so, how?

Stored where?
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Kaille

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Re: Biology Questions Megathread
« Reply #169 on: February 28, 2011, 10:07:09 pm »
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in cells?
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shinny

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Re: Biology Questions Megathread
« Reply #170 on: February 28, 2011, 10:10:56 pm »
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Quote from: Kaille on February 28, 2011, 10:07:09 pm
in cells?

They're often stored in vesicles (phospholipid membrane bubbles basically). This prevents them from reacting with anything else. A good example of this is lysosomes - basically vesicles within certain immune cells which are used to  to digest pathogens. If the contents of these just floated around everywhere (lipases, proteases, nucleases etc.),  the cell would practically eat itself.
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HERculina

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Re: Biology Questions Megathread
« Reply #171 on: February 28, 2011, 10:13:56 pm »
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proteins can be used as storage i think --> eg. Ferritin (storage of iron in spleen)

And, what structure (primary/secondary/tertiary) determines the functionality of an enzyme's active site?

EDIT: woopsies, shinny is right, misread question. ignore my storage comment  ^^
« Last Edit: February 28, 2011, 10:16:02 pm by PhilDunphy »
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shinny

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Re: Biology Questions Megathread
« Reply #172 on: February 28, 2011, 10:15:10 pm »
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Quote from: PhilDunphy on February 28, 2011, 10:13:56 pm
proteins can be used as storage i think --> eg. Ferritin (storage of iron in spleen)

And, what structure (primary/secondary/tertiary) determines the functionality of an enzyme's active site?

Ultimately, the tertiary.
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Kaille

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Re: Biology Questions Megathread
« Reply #173 on: February 28, 2011, 10:15:45 pm »
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tertiary :) and thanks for the help :)
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HERculina

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Re: Biology Questions Megathread
« Reply #174 on: February 28, 2011, 10:21:09 pm »
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Quote from: shinny on February 28, 2011, 10:15:10 pm
Quote from: PhilDunphy on February 28, 2011, 10:13:56 pm
proteins can be used as storage i think --> eg. Ferritin (storage of iron in spleen)

And, what structure (primary/secondary/tertiary) determines the functionality of an enzyme's active site?

Ultimately, the tertiary.

ok i was thinking that it would be tertiary. but could it be secondary cause the random coils/loops make up the active site?
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shinny

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Re: Biology Questions Megathread
« Reply #175 on: February 28, 2011, 10:22:43 pm »
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Quote from: PhilDunphy on February 28, 2011, 10:21:09 pm
Quote from: shinny on February 28, 2011, 10:15:10 pm
Quote from: PhilDunphy on February 28, 2011, 10:13:56 pm
proteins can be used as storage i think --> eg. Ferritin (storage of iron in spleen)

And, what structure (primary/secondary/tertiary) determines the functionality of an enzyme's active site?

Ultimately, the tertiary.

ok i was thinking that it would be tertiary. but could it be secondary cause the random coils/loops make up the active site?

But they don't. The tertiary makes the overall 3D structure.
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TrueLight

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Re: Biology Questions Megathread
« Reply #176 on: February 28, 2011, 10:26:13 pm »
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lol yea you dont get an alpha coil doing anything its the combined structure of alpha coils and beta sheets and the bonds that form between residues that make up the tertiary structure
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HERculina

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Re: Biology Questions Megathread
« Reply #177 on: February 28, 2011, 10:28:50 pm »
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kool thanks guys. i get it now :)
btw does the unit 3 exam have more bio-macromolecule q.s on it or more plasma m-brane/diffusion q.s
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shinny

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Re: Biology Questions Megathread
« Reply #178 on: February 28, 2011, 10:35:01 pm »
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Quote from: PhilDunphy on February 28, 2011, 10:28:50 pm
kool thanks guys. i get it now :)
btw does the unit 3 exam have more bio-macromolecule q.s on it or more plasma m-brane/diffusion q.s

It's pretty well balanced as far as I know. Biomacromolecules are generally MCQ questions though whereas diffusion and osmosis is basically a guaranteed short answer. That being said, try to understand the concepts of osmosis and such, whereas biomacromolecules is mostly rote learning.
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Drunk

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Re: Biology Questions Megathread
« Reply #179 on: March 01, 2011, 05:12:32 pm »
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In the beetroot SAC, an error would be that the amount of leaked pigment couldn't be quantified. How could you improve this next time?
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