How might ants on an acacia tree serve in a mutualistic relationship?
A) The ants fight off potential herbivores.
B) The ants carry disease.
C) The ants bring nitrogen to the tree.
D) The ants bring sugar to the tree.
A
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You are working with a gene associated with an essential pathway that is necessary at two time points in an organism's lifetime. With regard to gene regulation, you would expect the gene to be
A) not constitutive. B) associated with response to distinct events. C) "activated" by particular signals (induced). D) "turned off" by particular signals (repressed). E) all of the above
Which of the following sex and generation combinations directly produces the pollen tube of angiosperms?
A) male gametophyte B) female gametophyte C) male sporophyte D) female sporophyte E) bisexual gametophyte
Which is the correct order for the application of reagents in the Gram stain?
A. Crystal violet, alcohol/acetone, iodine, safranin B. Iodine, safranin, crystal violet, alcohol/acetone C. Crystal violet, safranin, iodine, alcohol/acetone D. Safranin, crystal violet, alcohol/acetone, iodine E. Crystal violet, iodine, alcohol/acetone, safranin
The material in the gray crescent of a frog embryo is necessary for normal development
a. True b. False