What is required for facilitated diffusion to take place?
a. energy from ATP
b. a transmembrane protein
c. the transport of large food particles
d. the transport of small nonpolar molecules
e. movement down a concentration gradient
b
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Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is
A. buffers. B. acids. C. water. D. salts. E. hydrogen.
Broad, flat molars and reduced canines characterize the teeth of ____
a. cows b. cats c. wolves d. humans e. apes
What is the process by which light energy is converted into the stored chemical energy of organic molecules?
a. diffusion b. endocytosis c. respiration d. fermentation e. photosynthesis
Human cultural evolution is generally divided into three stages. Explain how each has affected Earth. What will be an ideal response?