Food is usually contaminated by which of the following sources?
a. aerosols
b. mechanical vector
c. soil
d. handler
e. biological vector
b. mechanical vector
c. soil
d. handler
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Dinoflagellates that exist endosymbiotically within a variety of marine invertebrates are called
A. parasites. B. endotrophic. C. endoflagellates. D. zooxanthellae.
Some enzymatic receptors and most G protein-coupled receptors transmit the signal into the cytoplasm by utilizing other substances within the cytoplasm that are referred to as:
A. genes. B. intracellular receptors. C. second messengers. D. first messengers.
In secondary active transport, when the driving ion concentration is high and the transport ion concentration is low
outside of the cell, in which direction will the two ions move?
a. As the driving ion moves in, the transport ion moves in. b. As the driving ion moves in, the transport ion moves out. c. As the driving ion moves out, the transport ion moves in. d. As the driving ion moves out, the transport ion moves out. e. As long as both ions are moving together, they can go either in or out.
Which of the following does a plant cell have that an animal cell does not?
a. Chromatin b. Cytoplasm c. Central vacuole d. Lysosome