Outside the brain and spinal cord, which cells provide insulation to nerves?
a. microglia
b. astrocytes
c. oligodendrocytes
d. Schwann cells
e. satellite cells
D
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When characterizing DNA gyrase, the Cozzarelli group added a minimal amount of ATP to the reaction tubes containing DNA and gyrase. They did this in order to:
A. confirm that ATP would cause the reaction to reverse and the relaxed DNA would revert to supercoiled form. B. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 1 C. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 2 D. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 1 E. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 2
Answer the question using the accompanying figure. Which branch of this phylogenetic tree identifies Eukarya?
a. A b. B c. C d. D e. E
The dorsal surface of a turtle's shell is the ________ while the ________ is the ventral surface
a. carapace; keratin b. keratin; plastron c. plastron; carapace d. carapace; plastron
Bile:
a. has no effect on digestion b. helps in the digestion of fats c. helps in the digestion of carbohydrates d. helps in the digestion of proteins e. lowers the pH in the intestine