Which of the following is an intermediate in the reaction that forms Ala-tRNA?
A. Alanyl-ATP
B. Alanyl-ADP
C. Alanyl-PPi
D. Alanyl-AMP
D
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Cell-to-cell communication by quorum sensing has been shown to be important in the regulation of genes needed for
A. biofilm production. B. plasmid transfer. C. virulence. D. All of the choices are correct.
Kin selection is a form of natural selection in which ____
a. dominant individuals share resources disproportionately with their close relatives b. individuals help relatives only if they are likely to return the favor in the future c. group members sacrifice their own reproductive success to help individuals who are not their direct descendants d. shared alleles for altruism are perpetuated if the assisted animals produce more offspring than the helper could have produced if he had not helped e. shared alleles for altruism are perpetuated if the helper produces more offspring than the relatives that he aids
Some plants are able to attract beneficial insects that act as predators on the herbivores of that plant
Indicate whether the statement is true or false
Which pair demonstrates a mutualistic relationship?
a. orchid and its host b. rhizobia and strawberry plants c. soil fungus and soil bacteria d. mistletoe and its host e. mychorrhizae and roots