What agricultural practice encourages the rapid spread of plant diseases?
a. irrigation practices
b. use of herbicide sprays
c. genetic modification of crops
d. planting large areas with a single crop variety
e. use of pesticides
ANSWER: d
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Which of the following is the best description of a precursor metabolite?
A. A macromolecule consumed in the first steps of metabolism B. A carbon skeleton used as a starting substrate C. An enzyme that is reduced in a metabolic reaction D. An intermediate in the formation of cursor metabolites
When a single-gene mutation can have phenotypic effects at multiple stages of development, it is
A. pleiotropic. B. incompletely dominant. C. recessive. D. causing a disease. E. codominant.
The human population may reach 12 billion people by the year 2100. Applying your knowledge of energy flow, suggest the feeding habits necessary to support this large number of people
What will be an ideal response?
Based on the table above, which of the following statements is correct?
A) The amount of fat and sugar in cookies affects not only the cookies' weight and size but also their moisture. B) The amount of fat, but not of sugar, in cookies affects not only the cookies' weight and size but also their moisture. C) The amount of sugar, but not of fat, in cookies affects not only the cookies' weight and size but also their moisture. D) Fat and sugar do not affect the cookies' weight, size, and moisture.