________, a viral enzyme, is used to convert single-stranded RNA into ___________ for cloning.

Fill in the blank(s) with the appropriate word(s).


Reverse transcriptase; cDNA

Biology & Microbiology

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The fossil record indicates that the first vascular plants possessed roots

A. true B. false

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Rank these plant types from those that undergo senescence soonest after seed germination to those that live longest.  

Ranking Questions __  herbaceous perennial __  biennial __  annual __  woody perennial

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Which one of the following would provide the most calories?

a. 2 grams of salt b. 3 grams of butter c. 4 grams of sugar d. 5 grams of hamburger

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Parenchyma, collenchyma, and sclerenchyma are classified as tissues in the:a

dermal tissue system. b. vascular tissue system. c. ground tissue system. d. primary tissue system. e. secondary tissue system.

Biology & Microbiology