A disease that is present in unusually high numbers throughout the world is called a(n)
A) endemic.
B) epidemic.
C) sporadic.
D) pandemic.
Answer: D
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In fruit flies, which of the characteristics you studied was X-linked? ____________________
Fill in the blank(s) with the appropriate word(s).
Populations that were once considered separate species are sometimes reassigned to the same species because
A) they have evolved to look different from each other. B) they have evolved to look the same. C) they are no longer capable of interbreeding. D) it was discovered that they can produce viable and fertile offspring. E) they have been found to be genetically identical.
Control of the fermentation of foods to produce the desired product commonly involves
A) careful choice of foodstuffs. B) pretreating the food by boiling. C) adding required nutrients for microbial growth. D) use of a starter culture. E) both pretreating the food by boiling and adding required nutrients for microbial growth.
Griffith first proposed the "transformation principal" through his studies on Streptococcus pneumoniae bacterium. Which of the following molecules was later found to be responsible for this phenomenon?
A. protein B. RNA C. bacteriophage D. phage E. DNA