Virtually every food consumed by humans is originally derived from sunlight. This is easily seen in relation to plants and seeds, but the connection to meat is less clear. How is meat ultimately derived from sunlight?
a. Animals require sunlight to survive and thrive so the meat that people consume is supported by sunlight.
b. Animals utilize the heat from the sun for body temperature which supports the metabolic processes necessary to make muscle tissue.
c. The animals are fed a plant-based diet and use that energy (originally derived from the sun) to build the proteins that people consume when they eat meat.
d. The animals are mostly diurnal and will only eat during the day. Thus, the sun provides the light needed to support this diurnal lifestyle.
c. The animals are fed a plant-based diet and use that energy (originally derived from the sun) to build the proteins that people consume when they eat meat.
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In the Gulf of Mexico, red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans. As an environmental scientist, what would you suggest concerned citizens do to help prevent these red tides?
A. Purchase fuel-efficient vehicles B. Decrease the amount of artificial light in coastal areas C. Encourage sustainable fishing D. Reduce fertilizer use on lawns and gardens E. Participate in beach cleanup efforts
Which chemicals are the main ozone destroyers?
a. sulfur oxides b. nitrogen oxides c. chlorofluorocarbons d. polychlorinated biphenyls e. hydrocarbons
Rous sarcoma virus was identified when a scientist discovered that a virus passing between chickens was causing their tumors. The genome of this retrovirus includes the src gene, which encodes a tyrosine kinase that functions in signaling pathways leading to proliferation. The src gene is a
A) cyclin. B) proto-oncogene. C) reverse transcriptase. D) tumor-suppressor gene.
Intermediate filaments anchor the proteins actin and myosin that are involved in
a. muscle contraction. b. digestion. c. detoxification. d. oxygen transport. e. flagellar movement.