Which statement is true for most steroid hormones?
a. They dissolve readily in the blood.
b. They have no trouble entering their target cells.
c. They find and react with surface receptor molecules.
d. They cannot easily enter a target cell.
e. They developed from amino acids.
ANSWER: b
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Looking out your window, you may notice that the bark of a nearby oak tree has a mosaic appearance, consisting of deep fissures and relatively flat areas. What accounts for this mosaic appearance? Select all correct choices
A. the formation of new cork cambia as old cork cambia grow away from the phloem B. the formation of new secondary phloem in distinct, discontinuous patches C. the formation of new cork cambia in distinct, discontinuous patches D. the formation of new vascular cambia as old cork cambia grow away from the phloem
In response to LH and FSH, testes secrete ____
Fill in the blank with the appropriate word.
The vessels that carry blood away from the heart in a closed circulatory system are referred to as
A. arteries. B. veins. C. capillaries. D. sinuses. E. auxiliary hearts.
Which description illustrates the tertiary structure of a protein molecule?
a. bonding of two amino acids to form a dipeptide b. folding of a peptide chain to form an alpha helix c. association of several polypeptide chains by weak bonds d. order in which amino acids are joined in a peptide chain e. three-dimensional shape of an individual polypeptide chain