Minimal protection of specimen, personnel, and environment is accomplished with which class of biological safety cabinet?
a. Class I
b. Class II
c. Class III
d. Class IV
A
Biological safety cabinets are designated by class according to the degree of biological contain-ment they provide, from the lowest level of containment (class I) to the highest level of contain-ment (class III).
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Indicate whether the statement is true or false.
An organism is found to be almost unchanged from its 200 million year old fossil. This is an example of ____
a. stasis b. coevolution c. mass extinction d. adaptive radiation e. idealized design
Why do the deciduous leaves on temperate forest trees turn from green to orange, red, and/or yellow before falling?
A) The chlorophyll changes color as it's broken down. B) The chlorophyll is absorbed by the tree, leaving the other pigments visible. C) New photosynthetic pigments are created as the amount of daylight becomes limited. D) New pigments are created in response to colder temperatures.
Which of the following is not true about transcription factors?
A. Transcription factors are considered external cell regulators. B. Specialization of cells is determined/influenced by which transcription factors are active in the cell. C. There are many different types of transcription factors. D. Transcription factors are DNA-binding proteins. E. Genes code for transcription factors.