When selecting among multiple possible phylogenetic trees that fit our data, we use the principle of ____ , which means we choose the ____ possible hypothesis
In phylogenetic analysis, that
means selecting the tree that represents the ____ evolutionary changes or mutations.
Fill in the blank with the appropriate word.
parsimony, simplest, fewest
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Indicate whether the following statements are true or false. ____ All animals have a nervous system. ____ All animals sense and respond to the environment. ____ It is necessary to have a nervous system to sense and respond to the environment
What will be an ideal response?
The adaptive immune response differs from the innate response in that
A. B and T lymphocytes can each target multiple proteins, whereas the innate response targets only a single type of antigen. B. the adaptive immune response involves physical barriers and nonspecific processes, whereas the innate immune response relies on the actions of B and T lymphocytes. C. the adaptive immune response targets specific immunogens and remembers them, mounting an even stronger response on subsequent encounters, whereas the innate response is nonspecific and has no memory. D. the innate immune response targets a specific immunogen and remembers it to mount an even stronger response on subsequent encounters with that immunogen, whereas the adaptive response is nonspecific and has no memory.
Bacterial enzymes that are part of a rarely used catabolic pathway are usually organized into a(n)
__________. a. inducible operon b. repressible operon c. inducible zinc finger d. repressible leucine zipper e. inducible catabolon
Which of the following is a type of fungal microorganism?
A) bacterium B) protozoan C) algae D) yeast