Earthworms have a(n)
A) exoskeleton.
B) endoskeleton.
C) hydrostatic skeleton.
Answer: C
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The term for small invertebrates adapted to living in the spaces between sediment particles is: a. merofauna
b. macrofauna. c. microfauna. d. meiofauna.
The vast majority of invertebrates are:
a. parasitic. b. protostomes. c. terrestrial. d. evolutionarily primitive. e. carnivores.
The Streptokinase secreted by Streptococcus pyogenes
A. Lyses leukocytes, platelets, and erythrocytes B. Lyses blood clots and facilitates spread of bacteria in tissues C. Degrades complement component C5a D. Depolymerizes cell-free DNA in purulent material
Genetic manipulation of a microbe to remove one or more virulence factors is a method for producing a(n) ________ vaccine
A) attenuated B) inactived C) toxoid D) combination E) DNA