The brain uses three variables to determine the location and intensity of a stimulus. What are they?
What will be an ideal response?
The first variable is the nerve that delivers the action potentials. For example, action potentials arriving via the optic nerve are interpreted as arising from visual stimuli. The second variable is the frequency of action potentials. A higher frequency denotes a stronger stimulus. Finally, the number of sensory receptors firing gives the brain information about stimulus intensity.
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What is the process illustrated in this diagram?
a. asexual reproduction
b. apoptosis
c. quorum sensing
d. budding
Ben, a 17 year-old wrestler, developed a lesion on his upper back. The lesion was relatively round and consisted of a pink scaly rough center and raised edge. While it wasn't painful, the itching was bothersome to the young man. HIs coach advised him to see his doctor about the lesion. Upon visiting his physician, a scraping of the affected area was collected and placed in a drop of KOH, then examined under the microscope, revealing slender fungal hyphae. A culture was inoculated, which grew a spreading flat fuzzy colony after 10 days of incubation at 30oC. Microscopic examination of the culture demonstrated the presence of both macroconidia and microconidia. What is the most likely diagnosis?
A. Cutaneous blastomycosis B. Dermatophytosis C. Sporotrichosis D. Candidiasis E. Tinea versicolor
Distances on a genetic map are measured in _____ units.
A. centromere B. DNA C. dalton D. centimorgan
Which is the correct sequence of steps in the scientific method?
A. form hypothesis - observation - collect data - analyze results - design an experiment B. form hypothesis - observation - design an experiment - collect data - analyze results C. observation - analyze results - draw conclusion - design an experiment - form hypothesis D. observation - form hypothesis - design an experiment - collect data - analyze results E. observation - analyze results - form hypothesis - draw conclusions - design an experiment