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

Biology & Microbiology

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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.

Biology & Microbiology

The F factor can be integrated into the bacterial chromosome through ____

a. mitosis b. DNA replication c. transcription d. crossover events e. transduction

Biology & Microbiology

Which drug works by encouraging neurotransmitter release from the presynaptic cell?

a. caffeine b. alcohol c. cocaine d. depression medication e. heroin

Biology & Microbiology

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

Biology & Microbiology