The hormone that enhances fruit ripening is ____
Fill in the blank with the appropriate word.
ethylene
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When an atom or molecule gains one or more electrons, it is said to be:
A. energized. B. oxidized. C. polarized. D. reduced.
Which of the following statements concerning the microbial loop is not true?
A. Microbes consume dissolved organic matter. B. Microbes constitute particulate organic matter for zooplankton consumption. C. Marine viruses contribute to the production of dissolved organic matter. D. All of the choices are correct.
Many, though not all, mollusks have a shell. What secretes the shell?
A) The foot B) The mantle C) The radula D) The visceral mass
Which of the following statements regarding toxoids is FALSE?
A. They produce immunity to the toxin of the microorganism rather than the microorganism itself. B. They provide lifelong immunity. C. They stimulate antibody immune responses. D. They have few antigenic determinants. E. They are chemically or thermally modified.