Some bacteria avoid being phagocytized by a host's immune system by means of:
a. efficient use of their flagella.
b. ameboid motion.
c. their capsule.
d. changing their cell wall structure.
e. eliminating the use of a membrane.
C
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Due to high rates of water loss, all woody plants must produce more of which type of tissue?
A. secondary xylem B. secondary phloem C. cork D. bark
The water from rivers eventually flows into
a. aquifers. b. groundwater. c. oceans. d. surface water runoff.
Which of these organisms exhibit semelparity?
a. guppies b. shark c. bamboo d. antelope
What type of vaccine is the hepatitis B vaccine?
A. inactivated whole pathogen B. attenuated vaccine C. toxoid vaccine D. a recombinant vaccine composed of a single antigen of the hepatitis virus E. a vaccine produced by treating the virus with formaldehyde