Biological Molecules Flashcards
What do amino acids contain?
Carbon, hydrogen, oxygen and nitrogen, some contain sulfur
How many different amino acids are used in proteins?
Twenty
What are proteins held together by?
Peptide bonds
What is the primary structure in proteins?
The order in which the amino acids are arranged in a protein chain
What is the secondary structure in proteins?
Some chains fold into pleats that are held together by weak forces of chemical attraction called hydrogen bonds, the pleats are the secondary structure
What is the tertiary structure in proteins?
Some proteins have a tertiary structure, the chain of amino acids is folded into a ball that’s held together by a mixture of weak chemical bonds and stronger bonds.
What a globular protein?
If the protein has a spherical shape
What type of bond holds together the secondary structure of a protein?
Hydrogen bonds
What three elements do carbohydrates contain?
Carbon
Hydrogen
Oxygen
Give three examples of carbohydrates
Sugars
Starch
Cellulose
What are monosaccharides?
Single units from which all the other carbohydrates are built
What two forms does glucose have?
Alpha and beta
What are disaccharides?
Formed when two monosaccharides are joined together by a chemical reaction, a molecule of water is also formed
What is a polysaccharide
It’s formed when more than two monosaccharides are joined together by condensation reactions
What two polysaccharides are starch molecules made up of?
Amylose and amylopectin
Name two monosaccharides
Glucose and fructose
Name two polysaccharides
Starch and cellulose
What do lipids contain
Carbon
Hydrogen
Oxygen
Plant oils and animal fats are mostly made up of a group of lipids called…
Triglycerides
What does a triglyceride consist of?
A molecule of glycerol with three fatty acids attached to it
What is a fatty acid molecule?
A long chain of carbon atoms with an acid group at one end
What are attached to the carbon atoms in a fatty acid molecule?
Hydrogen
What does is mean by a fatty acid is saturated?
If every carbon atom in the chain is joined by a single bond
What does it mean when a fatty acid is unsaturated
If one or more of the bonds is a double bond
A fatty acid with many double bonds is…
Polyunsaturated
What are phospholipids
A type of lipid