The simplest structure shared among all living organisms is the
A. gut.
B. cell.
C. photosynthetic chloroplast.
D. community.
E. nucleus.
B. cell.
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The attraction between Na+ cations and Cl- anions form ____ that hold the ions together in the compound NaCl
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
During which phase of aerobic respiration is FADH2 produced?
a. glycolysis b. ethanol production c. acetyl-CoA formation d. the Krebs cycle e. glycolysis and the Krebs cycle
Which of the following statements is false?
a. A heart will stop beating when the nerves to the heart are severed. b. Some cardiac muscle cells are self-excitatory. c. The pacemaker of the heart is the sinoatrial node. d. Cardiac muscles join end to end to allow rapid communication. e. Cardiac muscles contract essentially in unison.
GPP, or Gross Primary Productivity:a
is the energy that remains in a plant after photosynthesis b. is the total energy captured from the sun through photosynthesis c. is the rate at which excess plant energy is converted to tissue for growth d. is the amount of energy available for primary consumers e. represents approximately 80% of the energy captured from the sun