Qualification > Sciences
Biology AS oct/nov 2010
Deadly_king:
--- Quote from: kaipai on May 22, 2012, 07:27:41 am ---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.
--- End quote ---
Okay, let's see how D turns out as the most appropriate answer ;)
Primary structure - the amino acid sequence of the peptide chains.
Secondary structure - highly regular sub-structures (alpha helix and strands of beta sheet) which are locally defined, meaning that there can be many different secondary motifs present in one single protein molecule. (DUE TO INTERACTIONS OF THE PEPTIDE GROUPS ONLY!)
Tertiary structure - Folding due to interactions of the side groups of the different amino acids.
Quaternary structure - complex of several protein molecules or polypeptide chains, usually called protein subunits in this context, which function as part of the larger assembly or protein complex.
IN OTHER WORDS ONLY THOSE ENZYMES CONTAINING MORE THAN 1 POLYPEPTIDE CHAIN WILL HAVE QUATERNARY STRUCTURE.
EG. LYSOZYME IS A SINGLE CHAIN AND DOES NOT HAVE QUATERNARY STRUCTURE.
So for the active site, it's certain to be tertiary structure! Depending on the enzyme, it may have quaternary as well but not all enzymes have it ;)
As for non-competitive inhibition, like I said it may bind almost anywhere! But a protein in this case an enzyme with a tertiary structure, has it's tertiary structure most exposed and weaker bonds! The primary and secondary structure are well hidden by the tertiary structure ;)
So we can now conclude that D was the most appropriate answer ;)
You're most welcomed :)
I've done Biology upto AS level and I scored A ;) But that was two years ago :P
kaipai:
Dear Deadly King,
First of all I must vigorously appreciate your efforts and knowledge that you answered with due detail and explained how the correct answer is D. Hats off to your stamina!
Just tell me how can I find the correct answer when I am in time limit during exams?
How did you prepare for AS bio exams 2 years ago and how you managed to secure an A (I am also currently taking AS bio)?
And Finally How can I use my faulty bio book (which is surprisingly endorsed) to secure Grade A at AS level? Please tell me how can I master such tricky and stamina testing questions which only brave people like you dare answer?
Thank you very very much,
My best regards for you to be most successful in all you career,
Good bye and take care.
kai pai
Deadly_king:
You are welcomed dude :) We in this forum are all ready to share our knowledge, resources and experience with other members ;)
Well, you should know the definition of each structure first and understand how they are maintained(I mean the bonds involved). This should be enough to help you answer these sorts of questions rapidly ;)
As for preparation, you should read and understand all the basic principles! Your book is not defective :P It may lack certain notes but it's still sufficient for you to score good marks ;) Understanding will help you answer the questions wisely!
And lastly, after you've completed the whole syllabus, then practise on past exam papers! Do as much as you can and correct them using Marking Schemes! Remember practice makes perfect ;)
Thanks for your wishes......that was very kind of you :D
kaipai:
Dear Deadly King!
Thanks a lot for replying again (not many people would do this!). Thanks a lot for encouraging me as well and for telling me that my bio book is not defective :D.
I want to ask another question of the same paper oct nov 2010.
Q. Which cell organelle does not contain nucleic acid?
A. Cholorplast.
B. Golgi Apparatus
C. Lysosome
D. Ribosome.
Tell me the correct answer which is not the third letter of alphabet neither the 1st letter nor the 4th letter but the remaing of the ABCD give above. Now tell me why and how on earth someone can know that the correct answer is not A but B.??????Again, sorry, my bio book not mentions this???PLZZZZZZZZZZZ explain how B is correct?
How did u prepare for bio AS from notes or from book? Tell me. U are the only one who would dare reply again, others here perhaps find my questions either too boring or too difficult. How many subjects did u take in a sitting? I am afraid taking 1 or 2 is bad?
Thank you deadly king!
Take care.
Deadly_king:
--- Quote from: kaipai on May 25, 2012, 07:26:02 pm ---Dear Deadly King!
Thanks a lot for replying again (not many people would do this!). Thanks a lot for encouraging me as well and for telling me that my bio book is not defective :D.
I want to ask another question of the same paper oct nov 2010.
Q. Which cell organelle does not contain nucleic acid?
A. Cholorplast.
B. Golgi Apparatus
C. Lysosome
D. Ribosome.
Tell me the correct answer which is not the third letter of alphabet neither the 1st letter nor the 4th letter but the remaing of the ABCD give above. Now tell me why and how on earth someone can know that the correct answer is not A but B.??????Again, sorry, my bio book not mentions this???PLZZZZZZZZZZZ explain how B is correct?
How did u prepare for bio AS from notes or from book? Tell me. U are the only one who would dare reply again, others here perhaps find my questions either too boring or too difficult. How many subjects did u take in a sitting? I am afraid taking 1 or 2 is bad?
Thank you deadly king!
Take care.
--- End quote ---
Very tricky question.......not so obvious :P
Anyway first you should know what exactly are Nucleic acids : They are DNA and RNA
1. Deoxyribonucleic acid (DNA) is a nucleic acid containing the genetic instructions used in the development and functioning of all known living organisms. They are found in nucleus of most cells.
2. Ribonucleic acid (RNA) is a nucleic acid which is essential for all known forms of life. They are of diverse types and may be located in many organelles. They are required for the synthesis of proteins since they code for them........meaning they carry precious information for the production of a particular protein.
Now we get back to your answers.......
All of them are organelles but they have different functions. It's their function which will help you identify the most appropriate answer here. ;)
Function of :
1. Chloroplast : Photosynthesis
2. Golgi Apparatus : Modifies proteins
3. Ribosomes : Synthesis of proteins
4. Lysosomes : Scavengers of a cell, they eat up old unwanted organelles
So here itself we can eliminate A and C since they both carry out synthesis and where synthesis is concerned, RNA are bound to be there ;)
There is also a type of RNA known as Ribosomal RNA founds in Ribosomes.
As for D, it engulfs all organelles which are no more in function, so it will definitely have taken in some RNA as well.
As for Golgi Apparatus, it only modifies the proteins but do NOT synthesise it ;) That's why it is free of nucleic acids :D
Hope I've been able to make it clear enough for you :)
Well for me I got notes from my tutor plus this book itself ;) The drawings help to understand a lot :)
Well I sat for Chemistry, Maths and Physics(complete A-level) and Biology and General Paper upto AS level ;)
Others are perhaps busy with exams and all ;)
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