How were mutants used to order the sevenless-Ras pathway?
A) Cells that expressed a constitutively active Ras mutant protein did not require Sevenless activation to become R7.
B) Cells that expressed a constitutively active Sevenless mutant protein did not require Ras activation to become R7.
C) Cells that expressed an inactive Ras mutant protein did not require Sevenless activation to become R7.
D) Cells that expressed a constitutively-inactive Sevenless mutant protein did not require Ras activation to become R7.
A) Cells that expressed a constitutively active Ras mutant protein did not require Sevenless activation to become R7.
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When driving on packed snow, you should reduce your speed by:
a. One-half or more. b. About one-third. c. About one-quarter.
Regions of a stem that give rise to new shoots or roots are called ____
a. ground tissue b. dermal tissue c. cortex cells d. internodes e. nodes
In a population, the difference between the birth rate and the death rate is the
A. population dispersion factor. B. per capita rate of increase. C. population density determining factor. D. S-shaped population curve. E. J-shaped population curve.
The index case is the first case in an epidemiological investigation
a. true b. false