Certain Receptor Tyrosine Kinases (RTKs) That Promote Excessive Cell Division

question 50

Multiple Choice

Certain receptor tyrosine kinases (RTKs) that promote excessive cell division are found at high levels in various cancer cells. HER2 is an RTK that is present at excessively high levels in some breast cancer cells. Herceptin is a protein that binds to HER2 and inhibits cell division. Herceptin may be an effective treatment for breast cancer treatment under which of the following conditions?

• A) If injection of HER2 in the patient's cancer cells inhibits cell division.
• B) If the patient's cancer cells have excessive levels of HER2.
• C) If the patient lacks functional HER2 proteins.
• D) If the patient has excessive levels of other RTKs in cancer cells.

---

Definitions:

Labor Demand Curve

A graphical representation showing the quantity of labor that firms are willing to hire at different wage rates, assuming other factors remain constant.

Purely Competitive

A market structure characterized by many buyers and sellers, free entry and exit, and products that are homogeneous.

Labor Productivity

Total output divided by the quantity of labor employed to produce it; the average product of labor or output per hour of work.

Productivity

A measure of the efficiency of production, often calculated as the ratio of outputs produced to inputs used in the production process.