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

Biology & Microbiology

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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

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology