What is an invasive species?
a. a nonnative species that often outcompetes native species, leading to their extinction
b. a native species that evolves a new trait and occupies more ecological niches
c. a nonnative species that enriches the species diversity of a new ecosystem
d. a nonnative species that often outcompetes native species, leading to evolution
e. a nonnative species that eventually becomes extinct
ANSWER: a
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The HIV protease has been the target of several anti-HIV medications called protease inhibitors. This antiviral strategy is possible because protease inhibitors _____
A) cause protease to precipitate out of the cell by combining with certain salt solutions B) cleave at specific places in viral polypeptides, resulting in the destruction of reverse transcriptase C) prevent HIV from generating ATP in the host cell D) prevent the formation of active viral proteins
Based on the following classification scheme, which two organisms are most closely phylogenetically related? Why?
What will be an ideal response?
The Greek word oikos means
(a) environment. (b) habitat. (c) house. (d) community.
The availability of genomic data has allowed scientists to construct more accurate phylogenetic trees than those based
on fossil evidence alone. a. True b. False