Which of the following are not used by protists for protection against predators?
A. flashing lights
B. protective coverings that are hard, tough, or slimy
C. sharp projectiles
D. shooting acids
E. toxins
Answer: D
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A middle-aged women presented to the emergency room complaining of cramping and gastrointestinal discomfort. She had recently attended a family reunion the past weekend. The event was a picnic where potato salad, hamburgers, deviled eggs, hot dogs and chips were served. A feces culture was requested resulting in no growth. What would be the next recommended follow-up testing?
a. Serologic testing for IgM and IgG b. No follow-up testing required c. Collect an additional specimen and at-tempt to cultivate on specialized media d. Treat the patient with ampicillin
People who work in department stores where music is played constantly in overhead speakers claim they don’t hear
the music. This is an example of ____.
a. sensory deprivation b. sensory adaptation c. behavioral modification d. a coordinated response e. a conditioned response
One critical requirement for life to arise on Earth was time for:a
the atmospheric temperature to increase sufficiently. b. molecules to accumulate and react with one another. c. the Earth's various climates to stabilize. d. the salinity of the oceans to stabilize. e. the ozone layer to form, so that the level of ultraviolet radiation was reduced.
In order to have a positive charge, an atom must have ________
A) more protons than electrons B) more electrons than protons C) more neutrons than protons D) more protons than neutrons