Hormones are
a. produced only in response to environmental stress
b. chemical signals between cells, transported in blood or hemolymph
c. signals that must interact with dna in order to be effective
d. are all under the control of the pituitary gland
e. always proteins

The correct is B Hormones are chemical signals between cells transported in blood or hemolymph.

Explanation:

Hormones are called chemical messenger of the cell because they transmit chemical information from one cell to the target  cell and regulating the functioning of that target cell by activating specific proteins related to the functioning of that target cell.

          Hormone is secreted from its source gland such as Pituitarygland, thyroid gland,adrenal gland.After being secreted hormones are transported via the blood stream to the target cell and binds to receptor of that target cell thus allowing the target cell to exert its biological function.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

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