Which of the following does not inhibit protein synthesis?
A. Tetracycline
B. Erythromycin
C. Streptomycin
D. Penicillin
E. All of the choices inhibit protein synthesis.
Answer: D
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Ecotourism measures ecosystem services such as carbon dioxide processing or water retention and purification
a. True b. False
This diagram illustrates the three suggested models of DNA replication. After describing the double-helix structure of DNA, Watson and Crick stated that this structure “... immediately suggests a possible copying mechanism for the genetic material.” Based on your knowledge of the structure of DNA, which of these three models were Watson and Crick most likely considering, and why?
a. the dispersive model, because it would take advantage of the mechanisms that create homologous recombination, a process with which Watson and Crick were familiar
b. the conservative model, because it is the only model that keeps DNA strands together, eliminating most potential sources of transcription errors during replication
c. the semi-conservative model, because each nucleotide can only bond to its complement, and each strand would rebuild a second strand from available nucleotides in the cell
d. the dispersive model, because it is the only model that would allow the DNA molecule to be reconstructed from end to end, copying a single nucleotide pair at a time.
All pinnipeds come ashore to: a. sleep and molt
b. birth and sleep. c. feed and mate. d. birth and molt.
Which specialization evolved in land plants to allow for reproduction in dry conditions?
a. xylem b. phloem c. stomata d. roots e. sporophyte dominance