In the Section "Investigating Life: Cutting Off a Tumor's Supply

question 24

Multiple Choice

In the section "Investigating Life: Cutting Off a Tumor's Supply Lines in the War on Cancer",what hypothesis were the researchers testing by treating tumors with endostatin and the standard chemotherapy drug?

• A)Endostatin works on endothelial cells,and therefore natural selection for resistance will not occur in tumor cells.
• B)Endostatin works on tumor cells,and therefore natural selection for resistance will not occur in endothelial cells.
• C)The standard chemotherapy drug works on endothelial cells,and therefore natural selection for resistance will not occur in tumor cells.
• D)The standard chemotherapy drug works on tumor cells,and therefore natural selection for resistance will not occur in endothelial cells.

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Definitions:

Cones

Photoreceptor cells in the retina of the eye that function best in bright light and enable the perception of color and fine detail.

Dark Adaptation

The process by which the eyes increase their sensitivity to low levels of light, allowing for better vision in the dark.

Rods

Photoreceptor cells in the retina of the eye that are sensitive to low light levels and are primarily responsible for night vision.

Dark Adaptation

The process by which the eyes increase their sensitivity to low levels of light, improving the ability to see in the dark.