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Biochemistry - PowerPoint PPT Presentation


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Biochemistry. Lysozyme – a protein. Chemical Bonds. Covalent bonds form between atoms of nonmetals by sharing of electrons - Molecules bond covalenty. Ionic bonds form between oppositely charged ions after the transfer of electrons - Salts bond ionically. Organic Molecules.

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biochemistry

Biochemistry

Lysozyme –

a protein

chemical bonds
Chemical Bonds

Covalent bonds form between atoms of nonmetals by sharing of electrons

- Molecules bond covalenty

Ionic bonds form between oppositely charged ions after the transfer of electrons

- Salts bond ionically

organic molecules
Organic Molecules

Organic molecules are molecules composed of carbon and hydrogen, and often containing other elements such as phosphorus, sulfur, oxygen and nitrogen

elements of life
Elements of Life

Carbon

Hydrogen

Phosphorus

Sulfur

Oxygen

Nitrogen

Six elements make up 96% of your mass!

carbohydrates
Carbohydrates

There are two types of carbohydrates:

  • The simple sugars
      • Glucose, sucrose, fructose (and many others)
  • The complex carbohydrates.
      • Carbohydrates that are made of long chains of sugars
      • Starches, cellulose, glycogen
simple sugars
Simple Sugars
  • All carbohydrates are made up of units of sugar (also called saccharide units).
  • Carbohydrates that contain only one sugar unit are called monosaccharides.

Glucose

Fructose

simple sugars7
Simple Sugars
  • Disaccharides have two sugar units bonded together.
  • For example, common table sugar is sucrose (below), a disaccharide that consists of a glucose unit bonded to a fructose unit. 
complex carbohydrates
Complex Carbohydrates
  • Complex carbohydrates are polymers of the simple sugars. 
  • In other words, the complex carbohydrates are long chains of simple sugar units bonded together.
  • For this reason the complex carbohydrates are often referred to as polysaccharides. 
complex carbohydrates9
Complex Carbohydrates

Starch (below) is a polymer of the monosaccharide glucose (n is the number of repeating glucose units and ranges in the 1,000's).

Starches and cellulose are complex carbohydrates used by plants for energy storage and structural integrity.

complex carbohydrates10
Complex Carbohydrates
  • Glycogen, another polymer of glucose, is a polysaccharide used by animals to store energy.
  • Both starch and glycogen are polymers of glucose.
  • Starch is a long, straight chain of glucose units, whereas glycogen is a branched chain of glucose units.
proteins
Proteins
  • Proteins are polymers of amino acids.
  • Amino acids all have the general structure:
  • The R in the diagram represents a functional group that varies depending on the specific amino acid in question.
proteins14
Proteins

When 2 amino acids bond together, water is released as the carboxyl end of one amino acid bonds to the amine end of the adjacent one forming a peptide bond, as illustrated at the left.

  • Because water is lost, the process is called:
  • Condensation synthesis, or…
  • Condensation polymerization
proteins15
Proteins

When many amino acids bond together to create long chains, the structure is called a protein (it is also called a polypeptide because it contains many peptide bonds).

proteins16
Proteins
  • Proteins are large molecules that may consist of hundreds, or even thousands of amino acids.
  • Proteins are important in cell structure, as enzymes, which speed up reactions in the body, and as antibodies which fight infection
slide18
Fats

Fats are a sub-group of compounds known as lipids that are found in the body and have the general property of being hydrophobic (meaning they are insoluble in water).

Other lipids include waxes, and steroids, such as cholesterol.

slide19
Fats

Fats are also known as triglycerides, molecules made from the combination of one molecule of glycerol with three fatty acids.

“R” is a long chain of carbon and hydrogen

Glycerol

Fatty

acids

Triglyceride

slide20
Fats
  • Fats are concentrated forms of energy storage
      • 9 calories per gram
  • Fats are components of cell membranes