The -helix is an example of what level of protein structure?
1.primary structure
2.secondary structure
3.tertiary structure
4.quaternary structure
5.both primary structure and secondary structure
Question 2
Which of the following is out of order for the Merrifield solid-phase method of peptide synthesis?
1.An amino acid is protected as a BOC-derivative.
2.The BOC-protected amino acid is linked to the polystyrene polymer.
3.The polymer-bound amino acid is treated with trifluoroacetic acid to remove the BOC group.
4.A second BOC-protected amino acid is coupled to the first by reaction with DCC.
5.All of the steps are in the correct order.
Structure of fish gills.
Structure of chlorophyll molecules in chloroplasts of plants
The thermodynamics of protein folding depicted as a free-energy funnel
Crystal structure of a synthetic Holliday junction
Primary steps in fibrinolysis
The nucleolus (arrow) is a prominent structure in the nucleus