After the secondary stain has been added, gram-positive organisms are stained ________ and gram-negative organisms are stained ________.
A. pink; pink
B. purple; pink
C. purple; purple
D. purple; colorless
Answer: B
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Darwin's three observations on the origin of species ___________
Fill in the blank(s) with the appropriate word(s).
Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
Gray matter is composed of axons with myelin sheaths
Indicate whether the statement is true or false.
Herbivores are unable to synthesize about half of the 20 ________ that are required to make proteins
Fill in the blank(s) with correct word