Pal and colleagues deleted genes to determine fitness effects in E. coli. How were fitness effects measured?
What will be an ideal response?
ANS:
They measured biomass production of the lines with deleted genes and compared them to wild type E. coli.
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Two solutions with similar solute concentrations are separated by a membrane that only water can pass through. One solution (B) Is of greater volume than the other (A). What will happen next?
a) The pressure gradient will drive water A, which will cause the solute concentration of B to increase b) Water will pass to B, increasing its volume. c) Any water that passes to A will create a tension on B, pulling the water back
Gametophytes reproduce ________
A) by producing sperm and eggs B) by fission C) by meiosis of special cells in the gametophyte D) by budding
Which is the first eon for which there is evidence of life?
A. Archean eon B. Proterozoic eon C. Stromatolite eon D. Hadean eon E. Phanerozoic eon
The atomic mass of an atom is the sum of the masses of the ________
a. electrons only b. protons only c. protons, neutrons, and electrons d. protons and electrons