Which was responsible for destruction of the ozone layer?
a. chlorofluorocarbons
b. carbon dioxide
c. methylmercury
d. methane
e. nitrogen
ANSWER: a
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Inserting a kanamycin resistance cassette into a catabolic operon to confirm the gene is essential in degradation of a particular compound would involve all of the following EXCEPT
A) a reporter gene. B) ligation. C) recombination. D) transformation.
What is the process that results in water droplets being forced out of the leaves of some plants?
a. transpiration b. guttation c. osmosis d. hydration e. ecdysis
The reason biologists believe that green algae and land plants, both members of the supergroup Archaeplastida, are related is because both of them possess chlorophyll a and b, as well as cell walls made of starch.
Answer the following statement true (T) or false (F)
Which of the following is present during meiosis but not mitosis?
A) a chromatid B) a centromere C) a spindle D) a tetrad E) sister chromatids