Which microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?
A. scanning electron
B. differential interference contrast
C. fluorescence
D. phase-contrast
E. transmission electron
Answer: A
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DNA is wrapped around histones, which contain many copies of the positive amino acids lysine and arginine. These positive amino acids neutralize the negative charge of the ______________ of the DNA wrapped around the histone
A. ribose sugar B. hydroxyl group C. nitrogenous base D. phosphate group E. All of the answer options are correct.
A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins. B. The shape change could induce scrapie protease activity. C. The shape change could stop the transcription of scrapie RNA. D. The shape change could stop the replication of scrapie DNA. E. The shape change could block the translation of scrapie RNA.
Interleukins activate and direct the movement of white blood cells from the blood to the tissues
____________________ Indicate whether the statement is true or false.
Some areas of the genitourinary tract are normally sterile, whereas other areas have a variety of microbiota. Describe the defense mechanisms of the genitourinary tract that contribute to this dichotomy
What will be an ideal response?