Which of the following would help a virus avoid triggering an effective adaptive immune response? I) having frequent mutations in genes for surface proteins II) building the viral shell from host proteins III) producing proteins very similar to
those of other viruses IV) infecting and killing helper T cells A) only I and III
B) only I, II, and IV
C) only I, II, and III
D) only II, III, and IV
B
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Enzymes _____
a. are proteins, except for a few RNAs b. lower the activiation energy of a reaction c. are changed by the reactions they catalyze d. are proteins, except for a few RNAs and lower the activation energy of a reaction
All of the following statements are true concerning
mycorrhizae EXCEPT that a. the fungus may penetrate into root cells. b. mycorrhizae increase the surface area for absorption. c. roots obtain minerals from the fungus. d. the fungus provides the plant with nitrogen-rich compounds. e. the plant provides the fungus with sugar.
Which of the following designates a human male with Klinefelter’s Syndrome?
a. XXY b. XY c. XX d. XYY e. XO
Freshwater aquatic organisms are faced with the problem of preventing excessive uptake or retention of water
Indicate whether the statement is true or false