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

Biology & Microbiology

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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

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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.

Biology & Microbiology

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

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Which of the following types of RNA molecule delivers amino acids to the ribosomes?

A) transfer RNA B) messenger RNA C) ribosomal RNA

Biology & Microbiology