Mutualists can best be described as
a) two organisms that can live independently, but they benefit by living together
b) two organisms that compete for the same resources in an ecosystem
c) an organism that lives off another organism without harming it
d) an organism that uses a host organism in a harmful way in order to live
Ans: a) two organisms that can live independently, but they benefit by living together
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Light energy passes from phycobiliproteins to reaction centers in
A) cyanobacteria. B) green sulfur bacteria. C) purple bacteria. D) most photosynthetic bacteria.
Studies of memory indicate that
a. short-term memory is the product of chemical changes in neurons. b. long-term memory is limited to a few year’s duration. c. long-term memories are lost more frequently than short-term memories. d. long-term memory retention is better for skill memory than for declarative memory. e. short-term memory is limited to several hundred bits of information.
A key component that is always important in the proper functioning of the immune system is:
a. direct cell to cell contact. b. hormonal action. c. communication between cells. d. antibody action. e. perforins
Only humans can be reservoirs of infection
Indicate whether the statement is true or false