Which of the following statements regarding toxoids is FALSE?
A. They produce immunity to the toxin of the microorganism rather than the microorganism itself.
B. They provide lifelong immunity.
C. They stimulate antibody immune responses.
D. They have few antigenic determinants.
E. They are chemically or thermally modified.
Answer: B
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Lignin is an important component in
A) tight junctions. B) plant cell walls. C) fungal cell walls. D) plasmodesmata. E) bacterial cell walls.
With each turn of the Krebs cycle, ____
a. the majority of ATP are produced b. oxygen is produced c. carbon dioxide is utilized d. NADH and FADH2 are produced e. pyruvate is produced
The significance of the Griffith, Avery, and Hershey-Chase experiments was that they demonstrated that
A. genes were located on chromosomes. B. DNA was the molecule of heredity. C. proteins were what genes were composed of. D. enzymes transformed bacteria.
Multiple nuclear divisions without cytoplasmic divisions result in cells called
a. mycoses. b. coenocytes. c. haustoria. d. pseudohypha