Which one of the following discoveries involving dna happened first?
a. chargaff discovered that base pairing was consistent in samples of dna.
b. griffith learned that a chemical changed harmless cells into harmful cells.
c. avery discovered that dna was responsible for storing and passing information through generations.
d. hershey and chase used bacteriophages to confirm that dna was the genetic material in genes.

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.