The activities of macrophages
A. are part of the specific response against disease.
B. are part of the nonspecific response against disease and stimulate phagocytic neutrophils.
C. stimulate lymphocytes to carry on specific immunity.
D. stimulate phagocytic neutrophils.
Answer: B
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. During what season would you expect oxygen levels to be lowest in a single year?
A. summer B. fall C. winter D. spring
Which of the following is false concerning the
atom in the figure? a. The number of protons and the number of electrons are equal. b. It has an atomic mass of 4. c. Electrons are moving around the nucleus. d. It has an atomic number of 2. e. The number of electrons exceeds the number of protons.
Which of the following statements about radioactive isotopes is true?
A) The nuclei of radioactive isotopes are unusually stable, but the atoms tend to lose electrons. B) When given a choice between radioactive and nonradioactive isotopes of the same atom, living cells are more likely to incorporate the radioactive isotopes into their structures. C) The energy emitted by radioactive isotopes can cause molecular damage in cells. D) Radioactive elements are natural and therefore not harmful.
Which of these statements is true?
a. Plasma membranes can rupture if the cell absorbs too much water or is compressed. b. Proteins and carbohydrates embedded in the plasma membrane cannot shift positions. c. Plasma membranes containing saturated fatty acids are more resistant to freezing. d. Carbohydrates represent the largest portion of the plasma membrane by volume.