What plants have been significantly altered by humans through artificial selection?
_____ maize.
_____ acorns.
_____ rice.
_____ wheat.
_____ Virginia creeper.
__X__ maize.
_____ acorns.
__X__ rice.
__X__ wheat.
_____ Virginia creeper.
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The enzyme complex associated with DNA in the figure above is _____
A) helicase B) DNA polymerase C) RNA polymerase D) topoisomerase
Boundaries offer unique habitats
A) that offer relatively easy access to adjacent communities. B) that do not offer easy access to adjacent communities. C) that support only species specially adapted to the boundary environment. D) whose composition is almost exactly the same as adjacent communities.
Bacteria:a
are incapable of locomotion. b. move by means of pili c. move by means of cilia. d. move by means of a rotating flagella. e. move by means of a whiplike flagella.
How do buffers minimize change in the pH of biological systems?
A) By absorbing H+ ions when there is an excess B) By donating H+ ions when there is a shortage C) Both of these D) Neither of these