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

secondary structure
primary structure
quaternary structure
tertiary structure

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Protein Structure
Metastasis involves

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

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Protein Structure
Cyclins are proteins that

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

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