What is the evolutionary origin of light skin in humans?
A) Light skin evolved several times in response to high ultraviolet light levels.
B) Light skin evolved several times in response to low ultraviolet light levels.
C) Light skin evolved several times in areas where there was no malaria.
D) Light skin evolved as an adaptation that decreased folate levels in humans.
B
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Blood cultures are collected from a 36-year-old patient suspected of having a disseminated fungal infection. History reveals that she was exposed to bird droppings and may have inhaled the conidia. What is the best blood culture system to use to ensure optimal recovery of this pa-thogen?
a. BACTEC b. BacT/ALERT c. ESP system d. Isolator system
Receptor adaption occurs when
A) impulse transmission stops at a synapse. B) the brain ignores the incoming action potentials. C) the stimulus stops. D) the sensory neuron stops sending action potentials. E) action potentials from multiple sensory neurons cancel one another.
In which of these landscape patches are species most subject to the edge effect? Explain your answer.
What will be an ideal response?
Eukaryotes generally do photosynthesis thanks to specialized cellular organelles called ___________ that originally resulted from endosymbiosis of cyanobacteria.
Fill in the blank(s) with the appropriate word(s).