[Campbell Biology P.423] According to Figure 18.10 and its accompanying description, which s... | Practice Question
According to Figure 18.10 and its accompanying description, which statement accurately describes the MyoD protein?
A: MyoD is a transcriptional activator composed of two polypeptide subunits, each possessing both a DNA-binding domain and an activation domain.
B: The DNA-binding domain of MyoD is located in the upper half of the protein, while the activation domain is in the lower half.
C: MyoD's activation domains primarily bind directly to DNA to initiate transcription.
D: MyoD is a single-subunit protein with separate regions for DNA binding and activation.
Explanation
Figure 18.10's description states that MyoD is "made up of two polypeptide subunits purple and salmon " and that "Each subunit has one DNA-binding domain lower half and one activation domain upper half ."