Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

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QUANTITATIVE Virus Entry by Endocytosis. Australian batlyssavirus (ABLV), a virus closely related to rabies virus, causes neurodegeneration in humans. It has a surface glycoprotein that mediates attachment to and internalization into host cells via receptor-mediated endocytosis.
(a)Investigators have tested whether dynamin is required for ABLV infection of cells. Cultured human embryonic kidney cells were treated with dynasore, a specific inhibitor of dynamin, before being infected with a virus expressing the ABLV glycoprotein. Do the resulting data (Figure 12-25a, left)indicate dynamin involvement Explain your answer.
(b)As a control, the researchers monitored cell viability at varying dynasore concentrations (Figure 12-25a, right). Why was this control necessary
(c)They then used chlorpromazine, a chemical that blocks the assembly of clathrin-coated pits, in similar tests. Are the results (Figure 12-25b)consistent with those results in part a Why or why not