[Campbell Biology P.494] Which statement about the WD40 domain or its visualization in Figur... | Practice Question
Which statement about the WD40 domain or its visualization in Figure 21.3 is FALSE?
A: The WD40 domain is typically 40 residues long, which is why it's named "WD40".
B: The Cn3D program displays a 3D ribbon model of cow transducin, and its structure has been experimentally determined.
C: Cow transducin is depicted with only one WD40 domain highlighted in gray.
D: Hallmarks of the WD40 domain are identified based on the chemical properties of amino acids, not strict sequence identity.
Explanation
Option C is false. According to Box 4, cow transducin 'contains seven WD40 domains, one of which is highlighted here in gray'. Therefore, the statement that it is depicted with only one WD40 domain highlighted implies it has only one in total, which is incorrect.