20) A cell arrested at the G1 checkpoint. Which of the following most likely caused this arrest? a) The cohesin proteins have been activated b) The kinetochore microtubules have been unable to capture all chromosomes o c) The cell has a mutation in the Cdc25 phosphatasewhere this protein has lost all its functions d) The tumor suppressor protein p53 has been activated to promote synthesis of the p21 Cdk inhibitor protein e) The APC ubiquitin ligase has added a polyubiquitin tag to (ubiquitylation of) the protein sccurin21) Cytochrome c: a) can be released to the cytosol when the cell receives an apoptotic stimulus b) promotes apoptosis when it is kept in the mitochondria c) has a higher affinity for electrons than oxygen d) has a higher redox potential than oxygen e) is normally found in the mitochondrial matrix
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