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The sequence of DNA on each chromosome where the sister chromatids are held together is called the?

Which proteins plays an important role in determining the specificity of signaling pathways within the cell?

Why are the receptors for polypeptide growth factors always expressed on the target cell surface?

The spindle assembly checkpoint monitors the alignment of chromosomes in the mitotic spindle during mitosis to insure an even distribution of chromosomes to each of the daughter cells. If the chromosomes do not align properly, the spindle assembly checkpoint will arrest cells in what phase of mitosis?

What would be the result if a failure of the spindle assembly checkpoint allowed anaphase to initiate while one chromosome was attached to microtubules from only a single centrosome?

Which protein complexes facilitates the branching of actin filaments?

What is not a function of H+ pumps?

Which lipids are distinctly enriched in lipid rafts?

Specific recognition between cell types such as leukocytes and endothelial cells of blood vessels is mediated by cell-surface glycoproteins called?

A major function of tight junctions is to?