A pathogen is a disease-causing organism, but not all pathogens are alike. Some pathogens are more dangerous than others. When describing the relative ability of a pathogen to cause disease, we are considering its ________
A) emergence B) infectivity C) virulence D) pathogenicity
Answer: C
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All phototrophic bacteria use a monophyletic photosystem in photosynthesis, thus there is intense competition for light between different phototrophic bacteria
Indicate whether the statement is true or false.
As a result of the way nerve impulses are propagated, they are unidirectional. Which of the following does not contribute to this phenomenon?
A) The time interval encompassed by the refractory period does not allow the impulse to travel in reverse. B) Presynaptic neurotransmitters and postsynaptic receptors are separated. C) Unidirectional sodium and potassium channels open only toward the axon of the nerve cell. D) Sensory processes are oriented in such a manner that the information is targeted to the dendrites of the nerve cell. E) none of the above
Members of the ____ Cnidarian lineageexist primarily as cube-shaped medusae, are active swimmers, and produce
one of the deadliest toxins made by animals.
a. Hydrozoa b. Scyphozoa c. Trematoda d. Cubozoa e. Anthozoa
Many people assume pedigrees are like phylogenies. Which of the following comparisons between pedigrees and phylogenies are true?
a. Both show the splitting and the recombining of branches or lineages over time. b. A pedigree tells us about the ancestry of individuals, while most phylogenies tell us about the ancestry of populations. c. Both expand as one looks backward in time. d. All of the above.