Which of the following is NOT true concerning
botulism?
a. It is a type of food poisoning.
b. The toxin is odorless and tasteless.
c. The pathogen is a virus.
d. The toxin enters motor neurons.
e. Muscles become paralyzed.
Answer: c
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It is difficult to estimate when cyanobacteria appeared on Earth using evidence from the oxidation state of the Earth's crust, because
A) several abiotic reactions could have formed Fe3+. B) there are multiple forms of anoxygenic photosynthesis. C) there are multiple groups of oxygenic photosynthetic bacteria. D) several ancient anaerobic metabolisms form Fe3+.
What is the key concept addressed by the question?
What will be an ideal response?
Why would mowing grass not damage the meristem and inhibit growth in height, but pruning a shrub
would?
What will be an ideal response?Which of the following is not a recessive trait in humans?
A. common baldness. B. red-green color blindness. C. mid-digital hair. D. albinism. E. sickle-cell disease.