• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

This assignment is primarily about lipids, triglyceride, unsaturated and saturated fats I will be stating the formation of lipids and what they are made of.

Extracts from this document...


Joe Parr 12 hol Biology Assignment Lipids This assignment is primarily about lipids, triglyceride, unsaturated and saturated fats I will be stating the formation of lipids and what they are made of. Lipids are a group of substances which include fats and oils, steroids which include cholesterol and some of the sex hormones, and various other substances such as the waxes which cover insect bodies and plant leaves. Lipids are a mixed group of hydrophobic compounds composed of the elements carbon, hydrogen and oxygen. Triglycerides are commonly called fats or oils. They are made of glycerol and fatty acids. They are present in a wide range of living organisms and help to insulate and protect animals such as seal and marine birds. If there are no C=C double bonds in the hydrocarbon chain, then it is a saturated fatty acid (i.e. saturated with hydrogen). These fatty acids form straight chains, and have a high melting point. ...read more.


They include: cholesterol, which is found in animals cell membranes to increase stiffness, bile salts, which help to emulsify dietary fats, steroid hormones such as testosterone, oestrogen, progesterone and cortical and vitamin D, which aids Ca2+ uptake by bones. Unsaturated fats are usually liquid at room temperature. They are found in most vegetable products and oils. An exception is a group of tropical oils like coconut or palm kernel oil which are highly saturated. Using foods containing "polyunsaturated" and "monounsaturated" fats does not increase our risk of heart disease. However, like all fats, unsaturated fats give us 9 calories for every gram. So eating too much of these types of fat may also make us gain weight. We can reduce the fat and unsaturated fats in our diets by using less fat, oil, and margarine. We can also eat more low-fat foods like vegetables, fruits, breads, rice, pasta and cereals. ...read more.


Saturated fats raise cholesterol levels and LDL-cholesterol levels more than dietary cholesterol itself. Triglycerides are insoluble in water. They are used for storage, insulation and protection in fatty tissue (or adipose tissue) found under the skin (sub-coetaneous) or surrounding organs. They yield more energy per unit mass than other compounds so are good for energy storage. Carbohydrates can be mobilised more quickly, and glycogen is stored in muscles and liver for immediate energy requirements. Triglycerides containing saturated fatty acids have a high melting point and tend to be found in warm-blooded animals. At room temperature they are solids (fats), e.g. butter, lard, and Triglycerides containing unsaturated fatty acids have a low melting point and tend to be found in cold-blooded animals and plants. At room temperature they are liquids (oils), e.g. fish oil, vegetable oils. Glycerol is a small, 3-carbon molecule Fatty acids are long molecules with a polar, hydrophilic end and a non-polar, hydrophobic tail. The hydrocarbon chain can be from 14 to 22 CH2 units long, but it is always an even number because of the way fatty acids are made. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Physical Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Physical Chemistry essays

  1. Investigation to analyse some fruit and vegetable juices for the contents present in them.

    RCOOH + CH3CH2COOH RCOOCH2CH3 + H2O C. Sodium Bicarbonate test Dissolve a pinch of the organic compound in water in a test tube . Add to it a few drops of aqueous NaHCO3 solution.

  2. Structure and function of lipids in plants and animals

    The digestion of triglycerides is catalysed by lipase enzymes which are found, for example, in the digestive system of animals and in germinating seeds, in the lysosomes inside cells and in the secretions of saprophytic bacteria and fungi. Triglycerides are created in fat storage depots, in such places as, in

  1. Alkaloids are the most diverse group of secondary metabolites and over 5000 compounds are ...

    Morphine is a naturally occurring substance and is the major constituent of opium, constituting about 10% (sometimes up to 20%) of its weight. Morphine was first isolated in 1805 by Friedrich Sert�rner. However, its basic structure was not correctly determined until 120 years later.

  2. Investigating the Rate of the Reaction between Bromide and Bromate Ions in Acid Solution

    53 311 53 310 316 44 314 43 314.5 45 314 321 32 323 31 322 24 323 29 323 (Table 3.4.2) 3.5 - Analysis of Results of Varying the Concentration of the Reactants From varying the concentration of each reactant in turn, I can determine the order of the

  1. In this essay I will be writing about the structure and the function of ...

    When ring structures are formed the alpha glucose's are able to link together and form longer chains. The way that the chains link together is by two carbon atoms bonding and forming a glycosidic bond. The beta glucose link together, the same way as the alpha do, with a glycosidic bond.

  2. Using Catalysts to Manufacture Margarine

    Nickel alloys like stainless steel containing mostly nickel are often used for things like gas turbine and chemical plants. In addition to this the above qualities, nickel is also used to make food like margarine where it is used as a catalyst for hydrogenation.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work