In the classification of organisms, a phylum is subdivided into
A) orders.
B) kingdoms.
C) tribes.
D) genera.
E) classes.
E
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a. are only limited by one factor at a time. b. increase arithmetically. c. may increase indefinitely. d. are limited by the carrying capacity. e. overcome limiting factors by increasing their biotic potential.
Which of the following statements is FALSE?
A) DNA polymerase joins nucleotides in one direction only. B) The leading strand of DNA is made continuously. C) The lagging strand of DNA is started by an RNA primer. D) DNA replication proceeds in one direction around the bacterial chromosome. E) Multiple replication forks are possible on a bacterial chromosome.
Heterotrophs must obtain organic molecules that have been synthesized by
A. autotrophs. B. bacteria. C. biogeochemical cycles. D. decomposers.
Transcription in bacteria differs from transcription in a eukaryotic cell because __________________________
(a) RNA polymerase (along with its sigma subunit) can initiate transcription on its own. (b) RNA polymerase (along with its sigma subunit) requires the general transcription factors to assemble at the promoter before polymerase can begin transcription. (c) the sigma subunit must associate with the appropriate type of RNA polymerase to produce mRNAs. (d) RNA polymerase must be phosphorylated at its C-terminal tail for transcription to proceed.