Researchers believe that at least ________ % of the species that have lived on Earth have become extinct

Fill in the blank(s) with correct word


99.9

Biology & Microbiology

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The use of bacteriophages to map bacterial genes is called ___________

A. generalized transduction B. cotransduction C. transformation D. conjugation E. none of the answers are correct

Biology & Microbiology

Apical meristems in lateral buds can give rise

to all of these structures except

a. branches. b. leaves. c. flowers. d. lateral meristems. e. there is no exception--lateral bud apical meristems can give rise to all of these structures.

Biology & Microbiology

Most amphibians are completely dependent on an aquatic environment for ____

a. respiration b. feeding c. reproduction d. movement e. thermoregulation

Biology & Microbiology

How long are restriction endonuclease recognition sequences?

A) 4-12 nucleotides B) 5 to 3 nucleotides C) Length can vary by 100 nucleotides, depends on organism

Biology & Microbiology