Repressible genes are usually actively transcribed when:a
repressor molecules bind to the promoter.
b. the end product of the enzymes encoded by these genes is low.
c. tryptophan accumulates in the cell.
d. quantities of precursor materials are high.
e. there is no other substrate that can be used by the cell.
b
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Estrogen is a lipid soluble hormone that can easily cross membranes. Knowing this, what can be concluded about estrogen receptors?
A. The receptors would be coupled to a G-protein. B. The receptors would be linked to enzymes that triggered a kinase cascade. C. The receptors would be found inside the cell. D. The receptors would be on the plasma membrane. E. The receptors would also be lipid soluble and able to cross membranes.
The slowly decaying organic litter from plant and animal tissues that is found in the soil is called ________.
A. the lithosphere B. aggregate C. a biofilm D. detritus
A low number of methyl groups is associatedwith:a
cancer. b. famine. c. chemicals in cigarette smoke. d. cancer and famine. e. all of these.
A metabolic pathway that is both anabolic and catabolic is a(n)
A) amphibolic pathway B) constructive pathway C) antagonistic pathway D) glycolytic pathway