Chapter 2- Proteins Flashcards
Draw a condensation reaction of two amino acids
What does the condensation reaction involve and what does it eliminate?
1) amine group (NH2) of one amino acid and the carboxyl group (COOH) of another
2) water is eliminated
What bond is formed?
What is a dipeptide?
Is a molecule consisting of two amino acids linked by a peptide bond
Because of the different R groups; the twenty amino acids are what?
The ribosome can make peptide bonds between any pair of amino acids so it makes polypeptides what?
Diverse- as they can be linked together in any sequence giving a huge range of possible polypeptides
The amino acid sequence of each polypeptide is stored in a codes form in what?
In the base sequence of a gene
How do base sequence of genes store amino acids?
Use genetic code
How many bases at needed to code for each amino acid?
3 codons (bases)
A protein may consist of what?
A single polypeptide or more than one polypeptide linked together
Give an example of polypeptides with 1, 2,3 and 4 polypeptides linked together
1) lysozyme - enzyme in secretion
2) integrin- membrane protein
3) collagen- structural protein in tendons, ligaments , skin etc
4) haemoglobin- transports protein in RBC
The amino acid sequence determines what?
The three- dimensional conformation of a protein
How is the three dimensional conformation of proteins stabilised?
By bonds between R groups of amino acids within the molecule
When disrupted or broken the protein becomes what?
How does heat cause desaturation ?
Causes vibrations within the molecule which can break intermolecular bonds