Which of the following bonds explains the cohesion of water molecules in the cohesion-tension mechanism?
A) Disulfide B) Peptide C) Hydrogen D) Ionic E) Covalent
C
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In this reaction, ADH represents the
a. enzyme. b. substrate. c. product. d. activation energy. e. trigger.
Denitrification ____
a. converts ammonium to nitrates b. reduces nitrates to nitrites c. reduces ammonia to ammonium d. converts atmospheric nitrogen to ammonia e. converts nitrates to nitrogen gas
Smooth muscles are NOT
a. striated and voluntary. b. isolated, spindle-shaped cells. c. found in the walls of hollow structures such as blood vessels and the stomach. d. involuntary and nonstriated. e. associated with the parasympathetic nervous system “rest and digest” phase
Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?
A. anaerobic Bacillus species B. Clostridium species C. Rhizobium species D. Azotobacter species E. cyanobacteria