When researchers test a new human cancer drug using mice, the mice constitute the
What will be an ideal response?
Model.
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Water ecosystems become eutrophic when there is ________.
A. nutrient removal from waters B. acidification of waters C. deoxygenation of waters D. nutrient enrichment of waters
Most scientists agree that global warming is underway; thus, it is important to know how plants respond to heat stress. Which of the following would be a useful line of inquiry to try and improve plant response and survival to heat stress?
A) the production of heat-stable carbohydrates B) increased production of heat-shock proteins C) the opening of stomata to increase evaporational heat loss D) protoplast fusion experiments with xerophytic plants
__________ are proteins that occur naturally in the
vertebrate nervous system but can cause fatal disease when they misfold. Fill in the blank(s) with the appropriate word(s).
When does a zygote become a multicellular creature?
a. at fertilization b. when cleavage begins c. when organs begin to form d. when the heart begins beating e. at birth