A biofilm is an example of (antagonism/competition/cooperation) among microbes.
Fill in the blank(s) with the appropriate word(s).
cooperation
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Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) all of the above
Crocodiles are living representatives of ____
a. anapsids b. archosaurs c. lepidosaurs d. synapsids e. dinosaurs
Which of the following statements about antibody-mediated immunity is CORRECT?
A. It primarily defends against viruses that have already infected cells. B. It primarily defends against bacteria that have already infected cells. C. It defends against parasites, bacteria, and viruses. D. It protects the body against cells that become cancerous. E. It is responsible for transplant tissue rejection.
Repressible operons require that ________ bind to the repressor protein before it can bind to the operator.
A. a coenzyme B. a cofactor C. the substrate D. the product E. the reactant