Of the different types of staining and microscopy techniques, which is basically the most sensitive?
A. Phase contrast
B. Chromogenic
C. Fluorescent
D. Light field
Answer: C. Fluorescent
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The condition that results when some organisms are shed in the bloodstream and distributed to distant parts of the body during bacterial growth in tissues is called
A) septicemia. B) bacteremia. C) uremia. D) erythemia.
The earliest cells most likely ____
a. were prokaryotic cells b. did not have a nucleus but had membrane-bound organelles c. used oxygen gas in order to thrive successfully d. used energy from the sun e. were multicellular
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.
Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates? I) changing the force of heart contraction II) constricting and relaxing sphincters in the walls of arterioles III) adjusting
the volume of blood contained in the veins A) only I and II B) only I and III C) only II and III D) I, II, and III