After an RNA molecule is transcribed from a eukaryotic gene, portions called _________ are removed and the remaining ________ are spliced together to produce an mRNA molecule with a continuous coding sequence.
A. caps ... tails
B. introns ... exons
C. codons ... anticodons
D. promoters ... terminators
B. introns ... exons
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The single most important measure to prevent the spread of disease is
A. home cooking. B. canning. C. pasteurization. D. hand washing.
The F factor can be integrated into the bacterial chromosome through ____
a. mitosis b. DNA replication c. transcription d. crossover events e. transduction
Which drug works by encouraging neurotransmitter release from the presynaptic cell?
a. caffeine b. alcohol c. cocaine d. depression medication e. heroin
Plasma membranes and some internal membranes have which of the following proteins, which trigger a change in the cell's activities in response to a stimulus?
A. Receptor proteins B. Transport proteins C. Adhesion proteins D. Transmembrane proteins E. Peripheral proteins