The Black Death was caused by which microbial species?
A. Serratia marcescens
B. Escherichia coli
C. Saccharomyces cerevisiae
D. Yersinia pestis
E. Staphylococcus aureus
Answer: D
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Nitrogen fixation depends on the enzyme nitrogenase, which is produced by some ________.
A. eukaryotes B. bacteria C. fungi and bacteria D. bacteria and Archaea but no eukaryotes E. Archaea
The number of species on an island depends on the size of the island and its distance from a mainland. This statement would most likely be made by _____
a. an explorer b. a biogeographer c. a geologist d. a philosopher
To see the structure of DNA, what type of
microscope would you use?
a. fluorescence microscope b. phase contrast microscope c. compound microscope d. dissecting microscope e. electron microscope
Termination of translation and release of the polypeptide chain occurs when
a. tRNA binds to a termination codon via a complementary anticodon but lacks an amino acid. b. a protein release factor binds to the termination codon. c. a tRNA with a complementary anticodon binds to a termination codon, and a release factor bound to the CCA end releases the chain. d. a small molecule shaped like puromycin binds to the termination codon.