Internal respiration
a. moves carbon dioxide from tissues into the blood.
b. moves oxygen from tissues into the blood.
c. moves oxygen from the blood into tissues and carbon dioxide in the opposite direction.
d. moves oxygen from tissues into the blood and carbon dioxide in the opposite direction.
e. moves both oxygen and carbon dioxide from tissues into the blood.
C
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Exotic species that are introduced into a non-native habitat can ____
a. interbreed with native species b. drive endemic species to extinction c. die out due to competition from native species d. blend in with endemic species e. create habitat islands for themselves
Voltage-gated ion channels open when a protein binds to the receptor.
a. true b. false
The earliest fossils of archaic humans known to have produced tools are
A. Homo ergaster. B. Homo erectus. C. Proconsul. D. Homo habilis. E. Australopithecus.
Sphingomyelin contains two hydrocarbon chains linked to _______ rather than to glycerol.
a. choline b. serine c. glycine d. tyrosine