RNA splicing removes ________________________ from the mRNA while keeping the __________________.
Fill in the blank(s) with the appropriate word(s).
introns; exons
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Which plants utilize a specialized carbon fixation enzyme and a unique cell structure to reduce the problems of photorespiration?
A. C3 B. C4 C. Desert D. Arctic
Aside from the traditional hypothesis that life on Earth developed via organic compounds produced in
a reducing atmosphere, which of the following alternative hypotheses is most likely?
a. Life could have arisen from the organic compounds formed around hydrothermal vents far below the ocean floor. b. Life could have developed on another planet and was then delivered by meteorites. c. The organic compounds necessary for life were delivered to Earth by meteorites. d. Life on Earth may have arisen inside land-based volcanoes. e. The organic compounds necessary for life could only have been produced in an oxidizing atmosphere
What type of test is a CEA test?
A. self-examination B. a type of cervical cancer test C. a type of prostate cancer test D. a tumor marker test E. a genetic test
What gives bones the strength to withstand mechanical stresses?
a. osteocytes b. minerals c. osteoblasts d. matrix e. collagen