Which of the following statements best describes the benefits of radiation therapy?
A. Radiation therapy can be combined with other therapies, including chemotherapy.
B. Radiation therapy can be directed against specific cells and tissues within the body.
C. Radiation damages the DNA within cancer cells, either slowing down cell division or stopping it altogether.
D. Radiation therapy may shrink tumors, making them easier to remove surgically.
E. All of the choices are correct.
Answer: E
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Precipitation occurs when
A. antigen combines with antigen. B. antibody combines with antibody. C. antibody combines with antigen. D. antibody combines with antigen at optimal proportions.
What organ enables reptiles and mammals to respond to pheromones?
a. Antennae b. Olfactory receptors c. Nasal cavity d. Vomeronasal organ e. Tongue
In lakes, the open-water surface layer is called the ____
a. benthic zone b. abyssal zone c. limnetic zone d. littoral zone e. profundal zone
Which statement is NOT correct about the lac operon?
A. It regulates the production of a series of five enzymes. B. It is normally turned off if glucose is present. C. It is an inducible system. D. The structural genes make products that allow lactose metabolism. E. Lactose binds to the repressor protein and inactivates it.