developed resistance to the drugs currently used to treat melanoma. as a result, researchers are investigating the effects of a new compound (drug x) on four different melanoma cell lines. researchers analyzed cell survival in two cell lines (figure 1) and oxygen consumption in the presence of drug x in all four cell lines (figure 2). figure 3 shows the proposed mechanism by which drug x affects cells

figure 1 percent survival of normal melanocytes and cancerous melanocyte (melanoma) lines 1 and 2 after treatment with different concentrations of drug x

figure 2 oxygen consumption per cell in four melanoma lines after treatment with either solvent alone or solvent containing drug x error bars represent ±2se.

figure 3 pathway leading to cell survival, growth, and proliferation and the likely effect of drug x

6 mark for review

based on the information presented, which of the following best explains why the researchers measured oxygen consumption as an indicator of the effectiveness of drug x?

a oxygen provides the source of electrons for cellular respiration and is necessary for energy production

b oxygen consumption increases the mutation rate and causes cells to become cancerous.

c oxygen activates apoptosis, which results in the death of melanoma cells.

d oxygen accepts electrons in oxidative phosphorylation, a process necessary for melanoma cell survival.

Question

developed resistance to the drugs currently used to treat melanoma. as a result, researchers are investigating the effects of a new compound (drug x) on four different melanoma cell lines. researchers analyzed cell survival in two cell lines (figure 1) and oxygen consumption in the presence of drug x in all four cell lines (figure 2). figure 3 shows the proposed mechanism by which drug x affects cells

figure 1 percent survival of normal melanocytes and cancerous melanocyte (melanoma) lines 1 and 2 after treatment with different concentrations of drug x

figure 2 oxygen consumption per cell in four melanoma lines after treatment with either solvent alone or solvent containing drug x error bars represent ±2se.

figure 3 pathway leading to cell survival, growth, and proliferation and the likely effect of drug x

6 mark for review

based on the information presented, which of the following best explains why the researchers measured oxygen consumption as an indicator of the effectiveness of drug x?

a oxygen provides the source of electrons for cellular respiration and is necessary for energy production

b oxygen consumption increases the mutation rate and causes cells to become cancerous.

c oxygen activates apoptosis, which results in the death of melanoma cells.

d oxygen accepts electrons in oxidative phosphorylation, a process necessary for melanoma cell survival.

Accepted Answer

# Brief Explanations:
- Option A: Incorrect. Hydrogen, not oxygen, provides the source of electrons for cellular respiration.
- Option B: Incorrect. Oxygen consumption does not increase mutation rate or cause cells to become cancerous.
- Option C: Incorrect. Oxygen does not directly activate apoptosis.
- Option D: Correct. In oxidative phosphorylation, oxygen acts as the final electron acceptor. If drug X affects oxygen consumption, it can disrupt this crucial process for melanoma cell survival, making oxygen consumption a valid indicator of drug X's effectiveness.

# Answer:
D. Oxygen accepts electrons in oxidative phosphorylation, a process necessary for melanoma cell survival.

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