Redness, swelling, heat, and pain of an infection are a result of the adaptive immune response
a. True
b. False
False
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After the depolarization phase of an action potential, the resting potential is restored by _____
A) the opening of sodium activation gates B) the opening of voltage-gated potassium channels and the closing of sodium channels C) a decrease in the membrane's permeability to potassium and chloride ions D) a brief inhibition of the sodium-potassium pump E) the opening of more voltage-gated sodium channels
George Beadle and Edward Tatum created a collection of mutants to study the following pathway
A mutant shows no growth on minimal media; however it shows growth if citrulline is provided. These results indicate the mutation would most likely be in the gene for: A. Enzyme I. B. Enzyme II. C. Enzyme III D. either Enzyme I or Enzyme II. E. either Enzyme II or Enzyme III.
All of the following structures are found within the nucleus of a eukaryotic cell except
A) speckles. B) Cajal bodies. C) promyeloctic leukemia (PML) bodies. D) nucleolus. E) All of the above are found in the nucleus
For the average person in the U.S., the largest source of radiation exposure is
A. background radiation. B. medical X-rays. C. irradiated food. D. consumer products. E. remote-controlled devices.