Which of the following is not a reason that mycorrhizae are particularly useful for enhancing the phosphorus uptake of plants?
A. They can neutralize phosphoric acid.
B. Their thin cells can access regions of soil
that plants cannot.
C. Movement of phosphorus through fungal
cytoplasm is faster than its diffusion through
soil water.
D. They can release phosphorus that is
bound to soils.
A
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What happens to the alpha subunit of a G protein with GDP attached?
A. It re-assembles with the beta and gamma subunits. B. It no longer activates an effector protein. C. It re-associates with the G protein-coupled receptor. D. All of these answer options are correct.
When undergoing strength training, the number of _____ in each _____ undergoes a/an _____.
A. myofibrils, muscle fiber, decrease B. myofibrils, muscle fiber, increase C. sarcomeres, myofibril, decrease D. muscle fibers, muscle, increase E. motor units, muscle, increase
The opening of the shells of some gastropods is protected by the:
a. parapodia. b. setae. c. operculum. d. head. e. cerata
Structures that are shed in one piece include
a. the cuticle of roundworms. b. the exoskeleton of arthropods. c. human hair. d. all of the above.