45. Transcription A. requires three types of RNA. B. synthesizes RNA from DNA. C

Question

45. Transcription A. requires three types of RNA. B. synthesizes RNA from DNA. C. occurs at the ribosomes. D. copies information from mRNA to tRNA E. synthesizes DNA from RNA 46. Posttranscriptional processing is the modification of A. proteins to form pro-proteins. B. mRNA to form tRNA. C. pre-mRNA to form functional mRNA. D. exons to form introns. E. DNA. .47. In ionic bonding, A. only non-polar molecules are involved B. a "sea of electrons" forms. C. electrons are transferred from one atom to another D. two hydrogen atoms share one pair of electrons. E. the charge of the ion does not play a role in the bond. 48. Covalent bonds form when A. atomic nuclei fuse. B. molecules become ionized. C. neutrons are transferred from one atom to another. D. protons are lost from atoms.

Explanation / Answer

45. B. Synthesis RNA FROM DNA

46.C. premRNA to functional mRNA

47. C. Electrons transferred from one to another

48. A. Atomic nuclei fuse

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