Large sponges belonging to the class ____ are harvested for commercial use
a. Hexactinellida
b. Sclerospongia
c. Spheciospongia
d. Demospongia
e. Calcarea
D
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Virginia was working as an undergraduate lab technician, and the graduate student she was working with instructed her to take some E. coli, and treat the culture with MgCl2 and CaCl2 to make the cells competent. Once Virginia produced the competent cells, she was able to
A. make them replicate their own DNA without an origin of replication B. make them susceptible to bacteriophage C. make them pass their DNA to a recipient cell via conjugation D. make them take up naked DNA from their environment E. None of these are correct
A simple way of thinking about the action of a
steroid hormone on its target cell is indicated by a. figure 1. b. figure 2. c. A, B, E, and F. d. E, F, G, and H. e. none of these
What plant group includes almost all modern crop plants?
A) gymnosperms B) annual plants C) dicots D) legumes
Which environment is ideal for plant cells, and which is best for animal cells?
a. isotonic for plant cells, and hypertonic for animal cells b. isotonic for plant cells, and hypotonic for animal cells c. hypotonic for plant cells, and isotonic for animal cells d. hypotonic for plant cells, and hypertonic for animal cells