The global hydrologic cycle begins with precipitation falling to Earth, and the cycle is completed by ________, driven by solar energy
Fill in the blank(s) with correct word
evaporation
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What molecules in the spliceosome catalyze the intron removal reactions?
A) RNA polymerases B) ribozymes C) tRNA D) introns
Dynamic instability of microtubules:
A. is caused by the large size of this type of cytoskeletal element. B. results from a deficiency of free tubulin subunits. C. allows microtubules to perform their functions. D. is shared by other cytoskeletal elements. E. All of these choices are correct.
Which example describes microevolution?
A) Birds evolved from dinosaurs. B) Lions and tigers evolved from a common cat-like ancestor. C) HIV evolved resistance to antiviral medications. D) Land plants evolved from algae.
The process of exon shuffling for the origin of new genes is supported by the evidence that
a. exons evolve more slowly than introns do. b. unicellular eukaryotic genes have fewer exons than multicellular eukaryotic genes. c. different genes have related exons. d. very few prokaryotic genes have introns. e. duplicated genes often have exons in a different sequence than the original copy of the gene.