*Lipid molecules have a HIGHER ratio of carbon and hydrogen atoms to oxygen atoms than carbohydrates have.
*Lipids store energy efficiently. They have large numbers of carbon-hydrogen bonds, which store more energy than carbon-oxygen bonds common in other organic compounds.
*Are used for insulation in the body
*Provide cushioning for internal organs
*Aid with hormones
*Structure of cell membrane
*All fats have glycerol and fatty acids. The fatty acids vary in length and in structure. Fatty Acids are Classified as either SATURATED or UNSATURATED.
*The classification depends on the proportion of Hydrogen Atoms to Carbon - Carbon Bonds in the molecule. The FEWER the hydrogen atoms the MORE double bonds there will be connecting the carbons. Double bonds can be broken and more hydrogen's Added.
Fats with double bonds are called UNSATURATED FAT.Fats with many double bonds are called POLYUNSATURATED FAT.
saturated fats have no double bonds (they are full) between the carbons and contain the maximum number of hydrogen atoms.
LIPIDS OR FATS
Three classes of lipids important to living things contain fatty acids:
TRIGLYCERIDES, PHOSPHOLIPIDS, and STEROIDS.
*TRIGLYCERIDES - composed of three molecules of fatty acids joined to one molecule of alcohol Glycerol.
*PHOSPHOLIPIDS - have two fatty acids joined by a molecule of glycerol. The cell membrane is composed of two layers of phospholipids called a LIPID BILAYER and forms a barrier between the inside and outside of the cell.
*The last group of lipids are STEROIDS, molecules that are composed of four fused carbon rings with various functional groups
CHECK THIS OUT!!
Here is another cool web page to help understand FATS/ LIPIDS
http://www.bbc.co.uk/education/asguru/biology/02biologicalmolecules/03lipids/index.shtml
QUESTIONS:
1. List 2 or more important biological functions of lipids.
2. Explain why fats are used as long term energy storage in the body?
3. Name the molecules that form a triglyceride.
HOME WORK and REVIEW
*--> carbohydrates, fats and complete worksheets based on both in handouts.
Make sure you do your assigned readings for proteins for Fridays class.
8 comments:
hey hey Mr Smith!
hey mr. smith its katie ... am i the only one who finds the warnings for using scissors in the hand outs funny? and im assuming u dont mind if we dont cut out the things for this evening because there are questions on the back of them. well ttyl toodles!
On the sheet it says that there are 6 blackboard question but theres only 3 on the website, am i missing something?
Yes those are funny warnings!
As for the questions I decided to go with three as I did not like the other remaining 3 to total up to the six. So please just do the 3 from the site.
Thanks for the correction and the feed back.
hey mr. smith,
do we cut up our work on page 15 for our fatty acid paper models models? or should i make a photocopy for the paper models?
thanks
madison
i think that you can just draw them on a seperate sheet of paper, maddy. that's what i did.
and thank you for not making us do the other three questions, mr.smith!
Okay, I totally love the scissor warnings. I confess.
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