____ nucleotides form the code for one amino acid
a. Two
b. Three
c. Six
d. Nine
e. Twelve
b
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Indirect development in sea urchins involves the presence of a _________________ stage.
Fill in the blank(s) with the appropriate word(s).
Many signal transduction pathways utilize second messengers to ____
a. transport a signal through the lipid bilayer of the plasma membrane b. relay a signal from the outside of the cell to the inside c. relay a signal from the inside of a cell membrane to the outside of the cell d. decrease the message once the signal molecules have left the receptor e. relay the message from the inner surface of the plasma membrane throughout the cytoplasm
Which is not a portal of entry?
a. Gastrointestinal tract b. Urogenital tract c. Respiratory system d. Circulatory system e. Skin
A(n) ________ is a disease in which antibodies attack specific cells of the body.
Fill in the blank(s) with the appropriate word(s).