According to the concept of punctuated equilibrium, the "sudden" appearance of a new species in the fossil record means that _____
A) the species is now extinct
B) speciation occurred in one generation
C) speciation occurred rapidly in geologic time
D) the species will consequently have a relatively short existence, compared with other species
C
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Select the best response to the question. ?Which of the following is a clinical indication for the use of a broad spectrum antibiotic?
A) The pathogen is virulent. B) The pathogen has not yet been identified. C) The pathogen is anaerobic. D) The host is immunocompromised.
The main form of glucose repression in the lac operon is
A. repression. B. the CAP/cAMP system. C. induction. D. inducer exclusion.
Which structure is not a component of a carpel?
a. anther b. stigma c. style d. ovary e. ovule
Which of the following is an example of a special sense?
A. touch B. temperature C. pain D. vision E. position