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Biology AS oct/nov 2010

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kaipai:
(I have modified this q to make it appear organized!!)
Q. This is the mcq on paper 12 bio oct/nov 2010.Plz some one reply. since i dont kno how to add tables or pictures here, I had to spoil the prezentation of the query.

12. Which levels of protein structure are always involved when competitive and non-competitive
inhibitors bind to enzymes?

            competitive                          |               non-competitive
A primary, secondary and tertiary         |           secondary
B quaternary and tertiary                     |          quaternary and tertiary
C secondary                                      |        primary and tertiary
D tertiary                                          |              tertiary

All u people who master bio! Plz reply. This is the humble desire of a Japanese!If u reply , plz tell me how and where u got the answere from?which notes u have that are so exact?And tell me whether u reply it by self wen u first saw it?There is load of such question in papers? how can I solve them?

Thanks!!!!!!!!!!!!

Deadly_king:

--- Quote from: kaipai on May 18, 2012, 03:42:42 pm ---Q.
12. Which levels of protein structure are always involved when competitive and non-competitive
inhibitors bind to enzymes?

competitive non-competitive
A primary, secondary and tertiary secondary
B quaternary and tertiary quaternary and tertiary
C secondary primary and tertiary
D tertiary tertiary

--- End quote ---

In competitive inhibition, then inhibitors bind to the active site of the enzyme! The latter is formed by tertiary and quaternary structure only ;)

In non-competitive inhibition however, the inhibitors may bind anywhere along the enzyme! In this case, it may be any structure ;)

So most appropriate answer for the MCQ is B ;)

Hope I've been of help :)

kaipai:
My textbook (Cambridge endorsed) mary jones biology for A Level doesnt mentions that active site is formed by tertiary and quaternary structures.????? How did you come know this?????NOw just tell me how will I know something similar about any other question if my book has not mentioned that?

which notes do you study from and where did you get them from-school, website or self made?

thank you for answering my question.

Deadly_king:

--- Quote from: kaipai on May 19, 2012, 04:59:01 pm ---My textbook (Cambridge endorsed) mary jones biology for A Level doesnt mentions that active site is formed by tertiary and quaternary structures.????? How did you come know this?????NOw just tell me how will I know something similar about any other question if my book has not mentioned that?

which notes do you study from and where did you get them from-school, website or self made?

thank you for answering my question.

--- End quote ---

Okay it may not have mentioned it directly just like that but am sure it's in there ;) Indirectly of course :P

Anyway give me the definition of active site as well as all those of the protein structures from your book.........if you understand it properly, you'll see how they all fit together ;)

As for me am a medical student, so my knowledge may be a bit far-fetched for you for the time being ;)

kaipai:
Dear Deadlyking,

Thanks a loooooot for replying me twice.
I am sorry to say that the answer is D i.e. Tertiary and tertiary. So unfortunately the answer is not B.I am sorry that I forgot to quote it before.

Could you now kindly explain how the correct answere is D??????
By the way what grade you scored in bio A level? ???
Thank u v much.

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