Lecture 5 - Protein 2

Question 1

What is in the protein structure

Answer 1

There are four levels
Primary
Secondary
Tertiary
Quaternary

Question 2

What happens in the primary structure

Answer 2

Sequence of amino acids in polypeptide chain

Question 3

What happens in the secondary structure

Answer 3

The polypeptide chain do not remain flat and straight
Hydrogen bonds form between amino acids in the chain
Automatically coil and fold
What could happen is a Alpha and beta pleated sheet - due to the hydrogen bonds depending how they are arranged in the the polypeptide chain

Question 4

What happens in the tertiary structure

Answer 4

Coiled and folded amino acid chain fold further
More bonds between different parts of the polypeptide chain
Then hydrogen and ionic bonds are formed
Disulfide bridges

Question 5

What happens in the quaternary structure

Answer 5

Some proteins are made from several different polypeptide chains
Held together by bonds
Is the way the polypeptide chains are assembled together

Question 6

What is transcription and what happens

Answer 6

Happens in the nucleus in eukaryotic and cytoplasm in prokaryotic cells
DNA is open and helicase goes in
RNA nucleus tides are attached , copies
mRNA is made during transcription
tRNA is complimentry to mRNA

Question 7

What is translation

Answer 7

Production of polypeptides
Using the sequence of codons carried by the mRNA
Occurs at the ribosome at they cytoplasm
Each unique tRNA molecule will attach to mRNA the complimentary
Once the right amount of amino acid are attached to there is a bond between each amino acid that forms the primary structure of the chain

Question 8

What do proteins produce

Answer 8

Produce many enzymes
Amylase
Protease
Lipase
Keratin - hair
actin and myosin - muscles
Immunoglobulins

Question 9

How many codes make up an amino acid

Answer 9

Three dna code make amino acid base

Question 10

Describe how monomers join to form the primary structure of a protein

Answer 10

There is a condensation reaction between amino acids forming peptide bonds creating a sequence in amino acid

Question 11

Two proteins have the same number and type of amino acids but different tertiary structures

Answer 11

There are different types of bonds within different places
Different primary structure and different sequence of amino acids