________ is (are) a crucial nutrient reservoir of phosphorus that is available to organisms
A) The atmosphere
B) Consumers
C) Autotrophs
D) Oceans
E) Rocks
E
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If you presented two substances–(1) LDL particles and (2) large aggregates of 'foreign' macromolecules–to a mixture of cells, which uptake mechanism would you expect the cells to use to ingest each substance? What distinguishes the uptake mechanisms?
What will be an ideal response?
Many kinds of cactus and other desert plants, such as a Euphorbia, are remarkably similar in that they have fleshy plant bodies and spines. Their flower structures, however, show that they are not related. The process considered to be responsible for their similarity in structure is
A. convergent evolution. B. divergent evolution. C. adaptive radiation. D. speciation by polyploidy.
In converting carbohydrates into fats, acetyl molecules are combined to form
A. amino acid. B. glycerol. C. fatty acid. D. keto acid.
Thyroid hormones bind to _____ receptors.
-G-protein-linked -tyrosine-kinase -plasma membrane ion-channel -steroid -intracellular