The steps of a spiral staircase would compare to what part of a DNA molecule?

a. sugars
b. hydrogen bonds
c. base pairs
d. nucleotides
e. phosphates


C

Biology & Microbiology

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Our own species, __________, appears to have evolved in Africa less than 200,000 years ago.  

A.  Homo habilis B.  Homo erectus C.  Homo sapiens D.  Homo hominis E.  Homo australopithecus

Biology & Microbiology

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

Biology & Microbiology

What is a contributing factor to an estuary's high productivity? a. The large amount of primary producers

b. The small amount of predators. c. The biomass of detritivores. d. The trapping of nutrients in sediments.

Biology & Microbiology

Which of the following is NOT an example of an invasive species?

A. Kudzu vine B. Sugar maple C. European gypsy moth D. Emerald ash borer E. Nile perch

Biology & Microbiology