Genes can be duplicated when a processed messenger RNA, from which introns have been spliced out, is reverse-transcribed to form a double-stranded DNA segment that is reintegrated into the main chromosome
What is the name for this process that may form nonfunctional pseudogenes?
retroposition or retroduplication
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In the nitrogen cycle, the bacteria that replenish the atmosphere with nitrogen are _____
A) Rhizobium bacteria B) nitrifying bacteria C) denitrifying bacteria D) methanogenic protozoans E) nitrogen-fixing bacteria
The diarrhea that is a symptom of diseases like cholera is due to problems in the function of the
A. stomach. B. small intestine. C. appendix. D. large intestine. E. gall bladder.
A bacterial chromosome consists of:
a. a linear DNA molecule many times larger than the cell. b. a circular DNA molecule many times larger than the cell. c. a circular DNA molecule smaller than the cell. d. a linear DNA molecule smaller than the cell. e. a linear or circular DNA molecule smaller than the cell.
Cardiac muscle fibers lack striations
____________________ Indicate whether the statement is true or false.