What limits the frequency of the action potentials?
A. Refractory period
B. Spike amplitude
C. Chloride ions
D. Nodes of Ranvier
Answer: A
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Genetically modified food has raised some concerns because
A. it contains radioactive particles. B. it may contain some unanticipated allergens. C. it may have some unintended environmental effects. D. the modified DNA may transfer to other organisms. E. it may contain some unanticipated allergens, it may have some unintended environmental effects, AND the modified DNA may transfer to other organisms.
After a fragment of DNA containing the gene of interest has been inserted into a vector, how are the gaps between the two pieces of DNA sealed together?
A. DNA polymerase catalyzes the formation of hydrogen bonds in the DNA backbone. B. DNA gyrase creates tension in the DNA backbone to hold the molecule together. C. DNA helicase causes the double helix to wind into its stable form. D. DNA ligase catalyzes the formation of covalent bonds in the DNA backbone. E. Restriction enzymes have the ability to join the two DNA fragments.
Place the following in the most likely order for biosynthesis of a
(1) phage lysozyme; (2) mRNA; (3) DNA; (4) viral proteins; (5) DNA polymerase. a. 5, 4, 3, 2, 1 b. 1, 2, 3, 4, 5 c. 5, 3, 4, 2, 1 d. 3, 5, 2, 4, 1 e. 2, 5, 3, 4, 1
A married couple has a son with sickle-cell disease. If this couple has more children, what is the likelihood that a daughter will inherit sickle-cell disease?
A. A daughter would be equally likely to inherit sickle-cell disease as compared to a son. B. A daughter would be less likely to inherit sickle-cell disease than a son. C. A daughter cannot inherit sickle-cell disease, while a son can. D. A daughter would be more likely to inherit sickle-cell disease than a son.