Flashcards in Lab 2 Biological Molecules Deck (19):
Large molecules that are made of smaller sub-unit molecules
Four most common organic molecules found in all living organisms
Carbohydrates, proteins, lipids and nucleic acid
Some macromolecules are polymers. Polymers are made up of repeating units called monomers.
For example, proteins are made up of chains of amino acids, starch is a chain of glucose molecules, and nucleic acids are chains of nucleotides.
Lipids are not polymers. Its structure is not a repeating chain of monomers.
The experimental group must always be accompanied by a control.
Ensures the effect observed in the experiment are the result of the phenomenon being test and not from another unidentified source.
Also give a baseline to which they compare their experimental results.
Something that will get a negative result in testing.
When you are using a solution you know contains the macromolecule you are testing for.
Should get a positive result.
Test should always be performed more than once to ensure that the initial results are repeatable.
It gives the experimenter confidence in their results.
Compounds composed of carbon, hydrogen, and oxygen with a ratio of 1:2:1.
This group includes sugars, starch, cellulose, and glycogen.
The simplest carbohydrates are monosaccharides. The most common are glucose (which often serves as an energy source in cells)
Is used to test for glucose in a solution.
Any colour change from blue is considered a positive test result.
Are large molecules of numerous monosaccharide components.
This is often an efficient way for cells to store energy.
Liver cells and muscle cells store glucose in the form of glycogen.
Some plant cells store glucose in the form of starch.
Tests for starch.
It changes from yellow brown to a very dark blue black.
Proteins are polymers of amino acids.
A protein is made up of one or more polypeptide chains.
To test for proteins.
Changes from light blue to purple in presence kf protein.
Molecules that catalyze chemical reactions
Chemical.messengers in the body
A proteins exposure to extremes of temperature or oh causes the weaker hydrogen binds that are responsible for a second and tertiary structure to break. Result is unfolding and loss of biological function.
One of the distinguishing features of these molecules is that they are insoluble in water.
Fatty acids vary in chain length and can be saturated (contain no double bonds) or unsaturated (contain one or more double bonds)
Fats serve as a long term energy source.
Adipose tissue is a form of connective tissue that is specialized in storing fats. Found beneath the skin surrounding various organs.