What extracellular plant signaling molecules can exert their effects at very low concentrations?
a. hormones
b. peptide
c. enzymes
d. pheromones
e. plasmodesmata
a
You might also like to view...
The product of the lacI gene is _____
A) an enzyme B) a transport protein embedded within the membrane C) ?-galactosidase D) the repressor
An antihistamine will
A. reverse spasms of respiratory smooth muscles. B. inhibit the activity of lymphocytes. C. bind to histamine receptors on target organs. D. block synthesis of leukotrienes.
You come across a recipe for rhubarb pie. Never having heard of rhubarb, you do a little research. You find out that the part of a rhubarb plant that people eat is the petiole of a large leaf. You purchase some rhubarb for your pie and notice that it contains many long stringy fibers. Based on your knowledge of plant tissues, you know that the stringy fibers are
A. xylem tissue. B. collenchyma tissue. C. phloem tissue. D. sclerenchyma tissue. E. parenchyma tissue.
The monomer unit of a protein is
A. fatty acids. B. amino acids. C. polysaccharides. D. nucleic acids. E. monosaccharides.