Which of the following statements about transcriptional regulators is false?
(a) Transcriptional regulators usually interact with the sugar–phosphate backbone on the outside of the double helix to determine where to bind on the DNA helix.
(b) Transcriptional regulators will form hydrogen bonds, ionic bonds, and hydrophobic interactions with DNA.
(c) The DNA-binding motifs of transcriptional regulators usually bind in the major groove of the DNA helix.
(d) The binding of transcriptional regulators generally does not disrupt the hydrogen bonds that hold the double helix together.
(a) Transcriptional regulators generally recognize specific sequences in the DNA by binding to the edges of the bases.
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When threshold potential is reached, ____
a. the activation gates of Na+ channels open b. the inactivation gates of Na+ channels open c. the activation gates of K+ channels open d. the inactivation gates of Na+ channels open e. Na+/K+ active transport pumps are activated
Which procedure is most useful in quantifying the active transcription of botulism toxin genes in a can of food that is contaminated?
A. DNA hybridization B. End-point PCR C. Real-time PCR D. Southern blot
When plasmids are used to produce a desired protein, the ________
A) plasmids multiply and produce the protein outside of the bacterium B) bacterial chromosome is genetically engineered, and the plasmid is used to help the bacterium replicate C) desired gene is inserted into the plasmid, and the plasmid is taken up by the bacterium D) bacterial genome and plasmid are inserted into the genome of the cell containing the desired gene
Which of the following lack a nucleus?
A) Animalia B) Bacteria C) Fungi D) Protozoa E) None