A relationship in which one partner benefits and the other is harmed is termed
A. commensalism.
B. parasitism.
C. independence.
D. mutualism.
B
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What is the main advantage of controlled burnings of forested areas? Controlled burnings _____
A) eliminate the possibility of forest fires B) clear forested areas for farmland C) prevent the overgrowth of the underbrush D) allow new species to form
The stage of viral replication in which the virus binds a cell surface receptor is:
a. Release b. Penetration c. Synthesis d. Attachment e. Assembly
Throughout the 1920s, Otto Meyerhof, A. V. Hill, and colleagues investigated how cells use energy to power muscle contraction. They determined that during muscle contraction, glycogen is broken down into lactic acid, a product of fermentation. Originally Meyerhof thought that the conversion of glycogen into lactic acid directly powered muscle contraction. This idea was overturned by experiments performed by Einar Lundsgaard. What evidence did Lundsgaard provide to suggest that glycogen breakdown and lactic acid production did not directly power muscle contraction?
A.) inhibition of fermentation of immediately halted muscle contraction B.) creatine phosphate infusions into muscle cells inhibited muscle cell contraction C.) muscle contraction could continue for some time after inhibition of fermentation D.) a pulse of electricity caused muscle contraction in isolated frog muscle tissue
Which of the following correctly compares the structures of plant and animal cells?
What will be an ideal response?