Even when a natural ecosystem is not completely destroyed, it may become broken into small pieces. This is known as
A) no-till cropping.
B) clear-cutting.
C) habitat fragmentation.
D) habitat destruction.
E) pollution.
C
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The semipermeable structure controlling the transport of materials between the cell and its external environment is the:
A) cell membrane. B) cell wall. C) cytoplasm. D) nuclear membrane.
Attachment of a bacteriophage to its host requires
A. specific surface proteins on the bacteriophage and specific receptor molecules on the host cell. B. nucleic acid protein interactions. C. specific receptor molecules on the host cell. D. specific surface proteins on the bacteriophage.
Which phase(s) of the Calvin cycle require ATP?
a. phase I only b. phase II only c. phase III only d. phases I and II only e. phases II and III only
Biochemical changes that occur in organisms through time can help us
A. understand how groups of organisms changed through time. B. infer relatedness. C. construct molecular family trees. D. All of the options are correct.