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ARHOLIADAU EXAMINATIONS
SEMESTER 1 EXAMINATIONS 2010
IBERS (BIOLOGICAL SCIENCES)
BS12210 CHEMICAL BASIS OF BIOLOGY
TIME ALLOWED: TWO HOURS
ANSWER ALL QUESTIONS IN THE SPACE PROVIDED ON THE QUESTION
PAPER
Rhif Cyfeirio’r Myfyriwr/ Student Reference Number: ……………………………………………
Dyddiad/Date ………………………………………………
Ystafell Arholiad/Examination Room ………………………………………………
Rhif y Sedd/Seat Number ………………………………………………
- Please give the information requested above and enter your name in the space provided at the top right of this page. If your answers are to be marked under a scheme approved by the College whereby the examiners will not know your identity, fold over and seal down the top right-hand corner (using the gummed slip provided) in order to conceal your name.
- The answers must be legibly written. The Examiners can either ignore illegible script or have it typed and the expense of typing charged to the candidate.
- Write your answers in ink.
- This paper must be handed in complete.
- If you leave the examination early, please do so quietly so as not to disturb other candidates. 1. Rhowch y wybodaeth angenrheidiol yn y blychau uchod a rhowch eich enw yn y man gwag ar dop y tudalen ar y dde. Plygwch a seliwch y cornel ochr dde ar dop y tudalen (gan ddefnyddio’r slip gludiog a ddarperir) er mwyn cuddio eich enw. 2. Rhaid i’r atebion fod wedi eu hysgrifennu’n glir. Gall yr Arholwyr nail ai anwybyddu sgript annealladwy, neu drefnu i’w theipio a chael yr ymgeisydd i gwrdd â chost y gwaith. 3. Ysgrifennwch eich atebion mewn inc. 4. Ni ddylid torri allan unrhyw ran o’r llyfr hwn; rhaid ei ddychwelyd mewn ffurf gyflawn. 5. Os ymadewch â’r ystafell arholi yn gynnar, gwnewch hynny’n dawel os gwelwch yn dda rhag aflonyddu ar ymgeiswyr eraill.
Fold over and stick down/plygwch y gornel drosodd
Cyfenw/Surname .............................................
Enwau Cyntaf/ Forenames ......................................................
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- Which of the following have a non-superimposable mirror image? (4 marks)
- Mevalonic acid is shown below: assign the asymmetric carbon atom with an asterisk (*) and draw the mirror image. (4 marks)
- Write the E and Z and D and L designations of the compounds below the structures. ( marks)
- Give the names of and provide structures of any five functional groups commonly found in biomolecules. (5 marks)
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- The following graph represents titration plot of acetic acid. a) What does the x- and y-axis represent? b) Provide structures of the species at points A, B and C. (5 marks)
- What is the half-life of an isotope if the activity of the sample falls from 200 disintegrations min-1^ to 150 disintegrations min-1^ in 50 min? (4 marks)
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B
C
A
- How does temperature increase the rate of a reaction? (2 marks)
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- What is the difference between ΔG° and ΔG°’? (2 marks)
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- Explain in simple terms the concept of reduction and give an example. (3 marks)
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- The following is the Nernst equation. Define each term of the equation and their units. (6 marks)
𝐸ℎ = 𝐸 0 − 2.303 ×
× log
[𝑅𝑒𝑑𝑢𝑐𝑒𝑑 𝑓𝑜𝑟𝑚]
[𝑂𝑥𝑖𝑑𝑖𝑠𝑒𝑑 𝑓𝑜𝑟𝑚]
