Restriction enzymes specifically recognize and cut short sequences of DNA called
A) introns.
B) exons.
C) sticky ends.
D) restriction sites.
Answer: D
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seal occupy in this food web?
a. decomposer b. detritivore c. primary consumer d. primary producer e. quaternary consumer
Phthalates mimic ____ in the human body
a. testosterone b. insulin c. glucose d. estrogen e. iodine
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A virus measures 100 nm in length. What is its length in ?m?
A) 10 ?m B) 1 ?m C) 0.1 ?m D) 0.01 ?m E) 0.001 ?m