All organisms living together in a place are called a(n)
A. ecosystem.
B. population.
C. species.
D. community.
Answer: D
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Resistance to chloroquine and mefloquine has been identified in which Plasmodium spp.?
a. P. ovale b. P. vivax c. P. falciparum d. P. malariae
Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?
A) because the Na+ concentration is much lower outside the cell than it is inside B) because the Na+ ions are actively transported by the sodium-potassium pump into the cell C) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior D) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell
The ________ is responsible for deep-seated emotions, including sex, hunger, thirst, pain, anger, and pleasure.
A. hypothalamus B. cerebellum C. limbic system D. pituitary gland
In order to use the energy stored in sugars, cells must first transfer it to ____ that is synthesized during aerobic respiration
a. carbon b. oxygen c. ATP d. NAD+ e. carbon dioxide