Protein Structure
The four subunits of the hemoglobin (Hb) gene represent protein's

secondary structure
quaternary structure
tertiary structure
primary structure

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Protein Structure
Cyclins are proteins that

regulate ability of cells to invade tissue
regulate apoptosis of damaged cells
None of these
regulate passage from one stage of cell division to another

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Protein Structure
Metastasis involves

ability of cells to dissolve cellular matrix
metalloprotein levels
decreased levels of proteins that regulate metalloproteins
All of these

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