Using the formula determine the original cell density in the sample: OCD = Number of CFU/Amount plated x dilution factor . You counted 235 colonies on a plate in your dilution series. The plate was inoculated with 0.1ml from a 10^-7 test tube, what is the OCD?
What will be an ideal response?
2.35x10^10
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Plants are more readily manipulated by genetic engineering than are animals because _____
A) plant genes do not contain introns B) more vectors are available for transferring recombinant DNA into plant cells C) a somatic plant cell can often give rise to a complete plant D) genes can be inserted into plant cells by microinjection E) plant cells have larger nuclei
A systemic release of histamine and other inflammatory mediators leads to the most dramatic immediate hypersensitivity reaction known as ______.
What will be an ideal response?
Photoautotrophs use _______for energy and _______as a carbon source.
a) glucose; CO2 b) light; glucose c) light; lactic acid d) light; CO2
In which period of evolution, in the Cenozoic era, would you find Homo sapiens?
A. Cretaceous B. Neoprene C. Jurassic D. Quarternary E. Paleogene