Regulation & Environmental Sensing
What will be an ideal response?
•Gene regulation is done to respond to environmental changes - how are those changes sensed?
1.Some changes can transmit directly into the cell - tetracycline resistance!
2.Others are sensed on the cell surface and a signal is sent into the cell
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The eggs of Paragonimus mexicanus measure approximately 80 µm by 40 µm, are unembryo-nated and operculated, and have thick shells that are brownish-yellow. An individual with this infection has most likely traveled to which endemic area?
a. Japan b. Africa c. New Guinea d. South America
Life tables provide data concerning
a. expected life span. b. reproductive age. c. death rate. d. birth rate. e. all of these.
Drugs that prevent the formation of the bacterial cell wall are
A) quinolones B) beta-lactams C) aminoglycosides D) tetracyclines
Which statement concerning fertilization in ferns is true?
A. The sporophyte grows from a spore. B. The process requires water. C. The fertilization product is haploid. D. A spore is the product of fertilization. E. The process occurs outside the egg-producing structure.