The structure at letter "B" is the ____ which ____
a. tongue; produces speech
b. epiglottis; closes the larynx
c. larynx; produces sound
d. epiglottis; closes the esophagus
e. pharynx; holds the trachea open
b
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What is the correct progression of steps for a direct-sequencing experiment?
A) Lyse cells, purify DNA, amplify genes by PCR, and insert genes into plasmid. B) Lyse cells, insert genes into plasmid, purify DNA, and amplify genes by PCR. C) Lyse cells, insert genes into plasmid, amplify genes by PCR, and purify DNA. D) Purify DNA, amplify genes by PCR, lyse cells, and insert genes into plasmid.
A drug designed to inhibit reverse transcriptase activity would target
A) coronaviruses and rhabdoviruses. B) hepadnaviruses and retroviruses. C) retroviruses. D) viruses with RNA genomes.
DNA polymerases ____
a. unwind DNA b. add new nucleotides to a strand c. catalyze carbon bonding d. assemble new strands in both direction e. repairs DNA
Nuclear pores permit the passage of all the following except:
A. proteins inward and outward. B. DNA molecules only outward. C. RNA only outward.