Which of the following is an effect of an antimicrobial that blocks tubulin polymerization?
A. Preventing binary fission in bacteria.
B. Preventing mitosis in eukaryotes.
C. Preventing bacterial motility.
D. Preventing pilus formation in bacteria.
E. Preventing cytoplasmic membrane synthesis in eukaryotes.
Answer: B
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Two potential devices that eukaryotic cells use to regulate transcription are _____
A) DNA methylation and histone amplification. B) DNA amplification and histone methylation. C) DNA acetylation and methylation. D) DNA methylation and histone modification. E) histone amplification and DNA acetylation.
Which of the following statements concerning activation energy is FALSE?
a. Exergonic reactions have an energy of activation. b. Endergonic reactions have an energy of activation. c. Enzymes lower a reaction's activation energy. d. Catalysts raise a reaction's activation energy. e. Activation energy is the energy required to break existing bonds.
Which proteins function in the resolution of Holliday junctions?
a. the Ruv complex b. integrases c. Zip proteins d. the RecBCD complex e. cohesins
Which biomolecules are responsible for the brilliant coloring of anoxygenic phototrophs (e.g., some roseobacters are pink)?
a. carotenoids b. phycobiliproteins c. thylakoids d. chlorosomes