You create cells with a version of Cdc6 that cannot be phosphorylated and thus cannot be degraded. Which of the following statements describes the likely consequence of this change in Cdc6?
(a) Cells will enter S phase prematurely.
(b) Cells will be unable to complete DNA synthesis.
(c) The origin recognition complex (ORC) will be unable to bind to DNA.
(d) Cdc6 will be produced inappropriately during M phase.
(b)
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Which of the following mutations is most likely to cause a phenotypic change?
A) a duplication of all or most introns B) a large inversion whose ends are each in the same region between genes C) a nucleotide substitution in an exon coding for a transmembrane domain D) a single nucleotide deletion in an exon coding for an active site E) a frameshift mutation one codon away from the end of the nontemplate strand
A patient's vaginal specimen is sent from the walk-in clinic to the microbiology laboratory. There it is cultured on bacteriological media and then placed into an ambient air incubator set at 22% oxygen and 37 degrees Celsius. The patient is strongly suspected of having gonorrhea. She had sexual contact with a partner recently diagnosed with gonorrhea, and she is now displaying the typical symptoms of a vaginal exudate or fluid. Neisseria gonorrhoeae is a microaerophilic gram-negative coccus-shaped bacterium. Seventy-two hours later, the culture has still not grown Neisseria gonorrhoeae so the lab reports the results back as negative. Interpret this result.
A. The culture was placed into the wrong environment for Neisseria gonorrhoeae. B. The inoculating loop was too hot while streaking the specimen onto agar medium, and the bacteria were all killed. C. Neisseria gonorrhoeae cannot be grown in bacteriological media and requires genetic analysis for identification. D. The clinical personnel took the sample from an incorrect body area.
At which point in the graph do voltage-gated potassium channels open?
A) A B) B C) C D) D E) E
Which of the following layers forms the outer
covering of the gastrointestinal tract? a. serosa b. mucosa c. conjunctiva d. muscle layer e. submucosa