Protein Structure
Signal sequences are part of a protein that

signal folding of the protein
transport proteins to other sites within the cell
signal the protein synthesis on the ribosomes is ended
refold proteins in prion-associated diseases

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Protein Structure
Cyclins are proteins that

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

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Protein Structure
Metastasis involves

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

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