Using specific examples, explain why it is sometimes impossible to satisfy Robert Koch's postulates
What will be an ideal response?
Answer: Answers will vary, but one issue is the consideration for a model animal host that will react to the (human) pathogen in the same manner as in a human host. For example, a chicken would not show flu-like symptoms when infected with the influenza virus. Another issue is the inability to cultivate some microorganisms outside of the host.
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The axon branches of a typical neuron terminate at structures called
A) synapses. B) boutons. C) glia. D) nodes of Ranvier. E) myelin sheath.
Algae and cyanobacteria are examples of primary producers
____________________ Indicate whether the statement is true or false.
The pollen-producing structure of a flowering plant is known as the ________.
A. carpel B. petal C. pollinator D. stamen E. ovule
Which of these characteristics does not promote outcrossing in flowering plants?
A. Self-incompatibility B. Physical separation of flower parts C. Apomixis D. Monoecism E. Dioecism