All of the following pertain to fluoroquinolones except
A. they include ciprofloxacin and levofloxacin.
B. they are used to treat respiratory, urinary, and sexually-transmitted infections.
C. they are broad spectrum.
D. they are nephrotoxic.
E. they work by inhibiting bacterial DNA replication.
Answer: D
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Which of the following statements best explains why microbial geneticists initially focused on regulation of gene expression at the transcriptional, rather than the translational, level?
A. The process of transcription was best understood by researchers at the time. B. The process of synthesizing an mRNA transcript is much less complex than translation of mRNA into protein. C. Cellular regulation of transcription is common to all prokaryotic cells. D. By regulating the first step of protein synthesis, cells conserve the greatest amount of energy.
The enzyme formate dehydrogenase (FDH) splits formic acid to H2 and CO2 and is crucial to survival during fermentation because if fermentive intermediates were allowed to accumulate within the cell, the internal pH would become far too ________ to support viability.
A. alkaline B. hypotonic C. acidic D. hypertonic
The size of the predator population is always greater than the size of the prey population
a. true b. false
Which part of an antibody molecule contains the variable regions of a heavy and light chain that fold into a groove that will interact directly with and bind to a specific antigen?
A. disulfide bonds B. Fc end C. Fab ends D. light chains E. heavy chains