Choose the true statement about foreign DNA in the human genome.
A. Most of the foreign DNA in the human genome is coding DNA.
B. New foreign DNA is regularly entering the human genome.
C. Most of the foreign DNA in the human genome is ancient.
D. Like the Drosophila genome, the human genome is constantly eliminating its foreign DNA.
Answer: C
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Many substances have been shown to accumulate in ecosystems, including the pesticide dichlorodiphenyltrichloroethane (DDT), which was described in the 1960s bestseller, Silent Spring, by Rachel Carson. DDT was a commonly used pesticide before its dangers became known. In some aquatic ecosystems, organisms from each trophic level consumed many organisms of the lower level, which caused DDT to increase in birds (apex consumers) that ate fish. Thus, the birds accumulated sufficient amounts of DDT to cause fragility in their eggshells. This effect increased egg breakage during nesting and was shown to have adverse effects on these bird populations. The use of DDT was banned in the United States in the 1970s. This is an example of which of the following?
a. biomass b. concentrated bioproductivity c. biomagnification d. bioentropy
Glycogen is a polysaccharide used for energy
storage by a. animals. b. plants. c. protistans. d. bacteria. e. archaea.
When reproductive interests between males and females of the same species differ, as in the case of fruit flies, sexual selection may actually favor adaptations arising in one sex but that are detrimental in the other sex
This, in turn, leads to subsequent "counter-measure" adaptations in the sex that are subject to harm or detriment. This kind of antagonistic sexual adaptation has been termed ________ sexual selection. Fill in the blank(s) with correct word
In general, which environmental condition is more harmful to enzymes?
A) A slight increase in temperature B) A slight decrease in temperature