How do primary producers provide energy for the food chain?
A. They receive energy from primary consumers.
B. They pass on organic substances from secondary consumers.
C. They make their own organic molecules via photo- or chemosynthesis.
D. They break down organic molecules into inorganic elements.
Answer: C
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Which of the four muscular chambers of the human heart directly propels blood into the pulmonary circulation?
A) right atrium B) right ventricle C) left atrium D) left ventricle
Which of the following is not a true statement about receptors that are localized to the nucleus?
A. They were synthesized in the cytosol. B. They carry a nuclear-localization signal. C. They bind polar ligands. D. They moved through a nuclear pore.
The cells of unicellular organisms are
A. Specialized to perform different tasks B. Able to carry out all of the functions necessary for life C. Unable to respond to changes in their environment D. Larger than those of multicellular organisms
Intertidal chitons and snails use the ____ as a means of attachment to the rocks
a. foot b. mantle c. visceral mass d. head e. radula