Larrea tridenta is chemically defended against most herbivores and some are able to survive
thousands of years.
Indicate whether the statement is true or false.
ANS: F, hundreds
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Which of the following observations was not considered by Darwin as he developed the theory of evolution by natural selection? a. Populations can produce more individuals than the environment can support
b. Individuals that are better suited to their environments produce more offspring. c. Variation exists within populations, and some variants are better suited to their environments than others. d. Individuals that are less well suited to their environments produce no offspring.
Eusocial animals are those that ________
a. live together for generations and have a reproductive division of labor b. typically display altruistic behavior c. nest in colonies but live separately the rest of the year d. associate with others of their species only for breeding
Which of the following is NOT true of enzyme behavior?
a. Enzyme shape may change during catalysis. b. Enzymes cannot make something happen that would not happen on its own. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes speed up reactions.
Mutations at the cutting site of restriction enzymes always lead to shorter fragments. Indicate whether the statement is true or false