Summarize the arguments both for and against irradiating foods. What will be an ideal response?
ANSWER: Irradiation kills all or most disease-causing organisms and does not change the nutritional
value of the food. However, these studies also show that irradiation does not destroy toxins
produced by bacteria before irradiation and does not prevent aging of fruits and vegetables.
Advocates point out that irradiation can eliminate the use of many chemical preservatives,
lower food costs by preventing spoilage, and reduce the cases of food-borne illnesses and
deaths caused by contaminated food each year in the United States. Those opposed to food
irradiation argue that irradiation produces mutation- and cancer-causing compounds in food
and that the testing of irradiated food to detect cancer-causing effects is inadequate.
Opponents also point out that treatment may select for radiation-resistant microorganisms
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Before insulin from recombinant DNA became available, diabetics were treated with insulin derived from cadavers
a. True b. False Indicate whether the statement is true or false
The biotic potential representing growth without limits at its maximal rate is indicated by what symbol?
A. ri B. N C. K D. dN/dt E. N/K
Predict what would happen as the entropy of a system approaches 100%
A) All motion would stop. B) Randomness would become maximized. C) Order would become maximized. D) Heat would decrease.
Which of the following statements is most correct concerning the movement of materials through the stomata?
a) Water moves in and O2, CO2 move out. b) Water and O2 move out, CO2 moves in. c) Water, CO2, and O2 move out, but only O2 moves in. d) Water and CO2 move in, O2 moves out. e) O2 and CO2 move in, water moves out.