Ergot poisoning is caused by
a) Giardia intestinalis.
b) Claviceps purpurea.
c) Aspergillus flavus.
d) Entamoeba histolytica.
Ans: b) Claviceps purpurea.
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How do bacteriophage influence bacterial evolution?
A) Bacteriophage cause cleavage and rearrangement of bacterial genomes, thus accelerating bacterial evolution. B) Bacteriophage lyse mutated bacterial cells, thus preventing them from replicating and passing on their genetic information. C) Bacteriophage transfer genetic information between bacterial cells through transduction, thus increasing the genetic diversity of bacterial populations. D) Bacteriophage decrease the size of bacterial populations and thus decreasing genetic diversity and slowing down bacterial evolution.
An embolus could block blood flow to the ________, resulting in a myocardial infarction, or it may block blood in the ________ and cause a stroke
A) brain; heart B) heart; kidney C) heart; brain D) brain; kidney E) liver; kidney
At a chemical synapse, the presynaptic and postsynaptic neurons touch and chemicals are exchanged through gap junctions
Indicate whether the statement is true or false
Oxygen kills some bacteria because of the production of _______
a. carbon dioxide b. oxygen free radicals c. a sodium cation d. water