Intertidal zones are determined by:
a. the substrate
b. the depth of water at high tide.
c. amount of sunlight available.
d. the amount of exposure between high and low tide.
d
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In an atom, the number of neutrons determines most specifically the ________.
A. chemical properties B. chemical element C. ion state D. isotope
Which of the following is true of osmosis?
A) Osmosis only takes place in red blood cells. B) Osmosis is an energy-demanding or "active" process. C) In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration. D) In osmosis, solutes move across a membrane from areas of lower water concentration to areas of higher water concentration.
Which cell line has demonstrated a consistent season-to-season isolation frequency of influenza viruses?
a. Primary monkey kidney b. Lung fibroblasts c. HeLa d. HEp-2
Which of the following types of RNA molecule delivers amino acids to the ribosomes?
A) transfer RNA B) messenger RNA C) ribosomal RNA