Without your glasses, the world is a blur, but you’ve discovered that if you squint your eyes, you can see well enough to read, at least for a few minutes. What condition do you suffer from?
a. presbyopia
b. hyperopia
c. myopia
d. astigmatism
c. myopia
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Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. epistasis. B. nondisjunction. C. crossing over. D. pleiotropy. E. chromosome inactivation.
When rural communities evolve in urban areas, they are often called
A. Rural enclaves B. Urban islands C. Rural keys D. Rural territories
A negative RNA virus must first
A. synthesize a negative RNA copy of its genome. B. synthesize a positive RNA copy of its genome. C. transcribe RNA polymerase. D. synthesize a DNA copy of its genome. E. transcribe reverse transcriptase.
The most debilitating external parasites of birds and mammals are spread by
A) a vector. B) an intermediate host. C) a definitive host. D) direct contact.