Mycorrhizae are
A) commensal relationships between a fungus and the leaves of a land plant.
B) symbiotic relationships between a fungus and the roots of a land plant.
C) mutualistic relationships between a fungus and an alga.
D) parasitic relationships between bacteria and the roots of a land plant.
E) symbiotic relationships between bacteria and the roots of a land plant.
B
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Place these genes in their temporal order of expression from earliest to latest during Drosophila development.
A. Bicoid, Gap, Homeotic B. Homeotic, Gap, Bicoid C. Homeotic, Bicoid , Gap D. These genes are not expressed at different times during development. They are expressed at the same time, but in a different spatial order. E. Kruppel, gooseberry, even-skipped
Which part(s) of a neuron that conduct(s) an electrical signal towards an adjacent neuron?
a. dendrites b. cell body c. axon d. both dendrites and the axon e. dendrites, cell body, and the axon
How can researchers confirm that phloem moves from a source to a sink?
A. They can use radioactive tracers to measure the flow of sap between two distances over time. B. They can study the cause of maple sap flow in producing syrup. C. They can observe the uptake of ink into the stem of celery. D. They can observe aphids and cut off their beaks. E. They can observe the effects of girdling a tree below the level of the majority of leaves.
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