The primary producers for hydrothermal vent
ecosystems are
a. chemoautotrophs.
b. chemoheterotrophs.
c. phytoplankton.
d. cyanobacteria.
e. algae.
A
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The atom:
A. is the basic unit of matter. B. is the unit of composition for elements. C. contains protons, neutrons, and electrons. D. has negatively charged particles circling around a positively charged nucleus. E. All of these statements about atoms are correct.
For water to vaporize
A. energy must be supplied. B. energy must be released. C. hydrogen bonds are broken. D. both energy must be supplied and hydrogen bonds broken. E. both energy must be released and hydrogen bonds broken.
In a DNA double helix, the phosphates are bonded to
A. phosphates. B. ribose. C. deoxyribose. D. uracil.
Which of the following statements concerning the chemical structure of an antibody is FALSE?
A) Antibodies are formed of four polypeptide chains. B) Antibodies have two long peptide chains known as heavy chains. C) Antibodies have two short peptide chains known as light chains. D) The stem and arm are connected by a hinge. E) The heavy and light chains are connected by hydrogen bonds.