As scientists began to purify and analyze RNA, it became apparent that rRNA and tRNA were modified. Whichtechnique allowed them to separate the various nucleotides so they could analyze the modifications?
A. polyacrylamide electrophoresis
B. agarose gel electrophoresis
C. thin-layer chromatography
D. sucrose gradient centrifugation
E. mass spectrophotometry
C
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A vaccine that protects against infection of some strains of genital HPV also protects against:
a. cervical cancer b. AIDS c. autoimmune diseases d. breast cancer e. genital bacterial infection
The diagram shows the rate of diffusion into a cell using carrier proteins. 
McGraw-Hill EducationCarrier proteins are saturated at which point?
A. 1 B. 2 C. 3 D. 4
Which feature do scientists mainly consider when grouping organisms according to evolutionary classification?
a) population size b) common ancestry c) identical niche d) similar bone structure
High fever, headache, extreme fatigue, and a rash on the face that progresses to fluid- and pus-filled sores before crusting over and healing are signs and symptoms consistent with infection with
A. adenovirus. B. herpesvirus. C. papillomavirus. D. polyomavirus. E. poxvirus.