A thermoreceptor responds to:
A. wet and/or dry environmental conditions
B. temperature
C. physical force
D. pain
B
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After mutagenesis, the nitrogen-fixing bacterium Sinorhizobium meliloti could no longer colonize Medicago truncatula plants. This inability to colonize was due to the absence of recognition by the host plant
Which of the following genes is most likely the site of the mutation in these bacteria? A) nitrogenase B) flavonoid-synthesizing enzyme C) Nod factors D) leghemoglobin E) peptidoglycans of the bacterial cell wall
The organelle that is the equivalent of a cellular garbage disposal system is the
A) nucleus. B) lysosome. C) mitochondrion. D) glucosome.
Does the permeability of the membrane to water affect the equilibrium flowin-flowout value?
a. Yes b. No
What kind of plants are epiphytes?
a. Plants that are not parasites but that do grow on other plants instead of the soil. b. Plants that trap animals and digest them. c. Plants that deal with nutrient-deficient soil by growing a large, netlike mesh of roots through several layers of the soil. d. Parasitic plants that use haustoria roots to obtain nutrients and food directly from other plants.