Who was the first to visualize and study microbes using a simple lens microscope?
A. Hippocrates
B. Robert Hooke
C. Van Leeuwenhock
D. Girolamo Fracastoro
E. Robert Koch
Ans: C. Van Leeuwenhock
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As described in "A Note About Bacterial Reproduction -- and the "Culture Bias,"" the organism Epulopiscium does not divide by binary fission. Rather, each cell increases in size and divides to produce multiple daughter cells that are held within the original cell well. After lysis, those daughters are released to repeat the process. Assuming Epulopiscium could be grown in pure culture in the laboratory in broth and on solid media (it currently cannot), which method would be best for measuring the increase in biomass during growth?
A. Direct microscopic count; the experimenter can directly count the number of cells and extrapolate to the biomass. B. Turbidity readings from a spectrophotometer; the increase in biomass will directly vary with the turbidity of the culture. C. Chemostat growth; it will prevent the culture from entering the death phase. D. The viable plate count; each colony derives from a single cell and the number of colonies equals the number of cells.
The luteinizing hormone (LH) ____
a. affects sex steroid hormone secretion b. has no function in males c. is produced by the corpus luteum d. stimulates milk production e. encourages growth of bone and soft tissues
We can see only a small portion of the entire electromagnetic spectrum.
a. true b. false
Which of the following is true for both instinct and learning?
A. They generate the correct response in all cases. B. They can be altered by an animal during its lifetime. C. They allow an organism to respond to changes in its environment in an appropriate manner. D. Both are inherited behaviors.