Thursday, 3 January 2013

2.6 describe the structure of carbohydrates, proteins and lipids


as large molecules made up from smaller basic units

Carbohydrates
Simple sugars- monosaccharides-such as glucose are the basic carbohydrates
They join together to make more complex disaccharides and polysaccharides: 


Proteins
are made up of amino acids
amino acids differ depending on what the 'r' (rest) is:
Lipids, Carbohydrates, and Proteins

Lipids
are made from combining glycerol and three fatty acids:
Lipids, Carbohydrates, and Proteins

The following video is quite good to watch, but it has a lot of extra content: http://www.youtube.com/watch?v=H8WJ2KENlK0

29 comments:

  1. how is starch, protein and lipids used in the body?

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    1. Carbohydrates are stored as starch in plants, but in humans it is glucose: glucose is used in respiration to create energy. Proteins are broken down into amino acids in the digestive system: these amino acids are then used to create new proteins which make up cells (growth and repair.) Lipids become fat stores in the body, these offer protection and insulation to our bodies; lipids can also be used to create energy.

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    2. what grade did you get in the end?

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    3. Humans store carbohydrates as glycerol so that when it is needed it can be turned into glucose faster than breaking down starch would allow. Second you cannot create energy, therefore lipids are broken down and energy is released from them.

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    4. Human's store carbohydrates as glycogen*

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    5. Oh yeah thanks your right where I said humans store carbohydrates as glucose I should have said as glycogen

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  2. did u get a stars in all sciences?

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  4. love this website :) but starch is not a monosaccharide

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    1. hey haanah A how can i gest marks like you...how did you practiced??

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  5. I hope, I get as good as you got for the sciences, Hannah A. Thanks a billion for this.

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    1. I hope you do too! No problem, good luck :)

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  6. where you have said "amino acids differ depending on what the "r" (rest) is" what does this mean?

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    1. Basically there are other molecules in the amino acid which you don't need to know about for GCSE and you just called it the R-group. In each R-group there are different molecules which change the amino acid- hope that answers your question :)

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  7. hi Hannah A! could you please give me some tips on how u revised!!! thanks

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  9. Hi! first of all, thank you, this is helping me a lot, secondly, where did you get the images from? They aren't loading, thanks

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  10. Hi! first of all, thank you, this is helping me a lot, secondly, where did you get the images from? They aren't loading, thanks

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  12. what grade did u get for other subjects such as languages and are u asian?

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  13. The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

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  14. Look more at

    http://igcse-biology-notes.blogspot.hk/2017/06/26-describe-structure-of-carbohydrates.html

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