So far we have studied transcription and translation in some detail. Last lesson we used THIS Slideshare when we looked at the additional content needed for topic 7 on translation. As we have covered a lot of this already when we went through topic 3 you should have found this relatively straight forward.
Now that we know how cells go from a code stored in a molecule of DNA to an actual protein, we need to now look at the translated proteins in more detail.
Several people have spoken to me about the slideshare we are using to learn about biological molecules, and are struggling to use it effectively. (It’s ok, different resources work for different people). I am also aware that the SL students are still missing a text book. To help I have some supplementary notes that cover the same information which I have posted here for you Organic Compounds Notes if you dont like the slideshare. Thanks to Gretchen Kitchener for this.
While I am at it here are a few notes that support the additional higher level information you need to know about proteins.Additional HL notes about proteins. and slide share http://www.slideshare.net/gurustip/proteins-ahl-c1-presentation if you are aiming for a level 6 or 7 I do recommend this slideshare(Topic 7.5), OR you can look at this powerpoint from Mrs. Nadine Dickinson which has the same information (but without polar molecules).Proteins AHL. We will look at these in more detail later – though if the HL students want to get ahead then ……..
In class today I will set you a homework on biological molecules, if you lose the printed version you can access it HERE
Apologies for this but I have been in contact with Ms Cavalli and she has requested that several of you be excused during the lesson tomorrow to help out with a CAS activity. If we still write the test tomorrow it means I would have to write separate HL and SL tests for the CAS participants. Consequently I have decided to move the test to
MONDAY 9TH DECEMBER
This means that the students who take SL Maths will be able to concentrate fully upon their Maths test on Friday!
Well that was Topic 2 (so you know what must be coming next – a topic test)! We are now about to embark on the next topic, The Chemistry of life. Here are the syllabus outlines for Topic 3, and also Topics 7 and 8 (as they are extensions of Topic 3).Topic-378-syllabus-outline If you like Biochemistry then you are in for a wonderful 36 hours of pure chemical pleasure; if not then be prepared to dig in for the long haul. There is a lot of really important Biochemistry here that you need to know. Topics 7+8 are part of the Additional Higher Level, so for a while we will be saying goodbye to our SL colleagues. More about this later.
The first couple of hours we will spend looking at the basic chemical elements of life, and water. Now this does not sound too exciting, but actually water is very special in the way it behaves. It has a higher boiling point than you would expect (H2S is a gas at room temperature), water molecules stick to each other (Cohesion) and stick to other substances (Adhesion). It can also dissolve ionic substances, has a high specific heat capacity, and is opaque; all features which make it very useful for living organisms!
We will perform a web search to answer the following questions
- What are the most frequently occurring chemical elements in living things?
- Why are calcium, sulfur, phosphorus, sodium and iron needed by plants, animals or prokaryotes?
- What does a water molecule look like?
- What are the thermal, cohesive and solvent properties of water?
- How do these properties relate to water’s use in living organisms as a coolant, medium for metabolic reactions and transport medium?
We will answer the questions using the attached worksheet produced by a previous colleague of mine, Mr Eamonn Hobbins. ! Topic 3 Water-Web-quest
Now you have had the opportunity to find out the information for yourself, here are the answers. Make sure that you find the time to check your answers against the ‘official’ answers! Water-Web-quest-MScheme
You may find this slideshare presentation useful here to complete the web quest http://www.slideshare.net/gurustip/chemical-elements-and-water-presentation
Next we will look at the following major groups of molecules, Carbohydrates, Proteins and Fats. We will make use of another of Stephen Taylor`s slideshares http://www.slideshare.net/gurustip/carbohydrates-lipids-and-proteins-presentation