The primary building block (monomer) of proteins is
A. an amino acid.
B. a nucleotide.
C. a fatty acid.
D. a glucose molecule.
E. a group of four interconnected rings.
A. an amino acid.
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The shape of the needlelike leaves of pine trees is a specialization that helps the tree ________
a. conserve water b. receive light to all leaves c. deter plant-eating insects d. maximize gas exchange
Which gland stores hormones produced by another gland, rather than producing hormones itself?
a. hypothalamus b. thyroid c. posterior pituitary d. pancreas
In pulmonary emphysema, alveoli lose their elasticity. Indicate whether the statement is true or false
A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed. Suppose a plant has a unique photosynthetic pigment and the leaves of this plant appear to be reddish yellow. What wavelengths of visible light are absorbed by this pigment?
A) red and yellow B) blue and violet C) green and yellow D) blue, green, and red