Which is true of heterotrophs?
A) They capture light energy.
B) They cannot be unicellular.
C) They store energy in the form of heat.
D) They can function as autotrophs in an emergency.
E) They can obtain energy by consuming phototrophs.
Answer: E
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Data in this figure suggest
A) butterfly populations are declining. B) butterfly habitat is degrading over time. C) butterflies are moving north over time. D) two species of butterflies are evolving over time.
In humans, the fluid immediately surrounding the embryo is contained in the _____
a. allantois b. placenta c. chorion d. amnion e. yolk sac
In a signal transduction pathway involving cAMP as a second messenger, after a G protein is
activated, the activated G protein then activates:a. phospholipase C. b. adenylyl cyclase. c. calmodulin. d. protein kinase. e. diacylglycerol.
Mycorrhizal fungi have a mutually beneficial relationship with plants in environments with soils that
A) are saturated with water. B) have a high clay content. C) are acidic. D) are low in nutrients.