You are studying a disease that is caused by a virus, but when you purify the virus particles and analyze them you find they contain no trace of DNA. Which of the following molecules are likely to contain the genetic information of the virus?
(a) high-energy phosphate groups
(b) RNA
(c) lipids
(d) carbohydrates
(b)
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What plants have been significantly altered by humans through artificial selection?
_____ maize. _____ acorns. _____ rice. _____ wheat. _____ Virginia creeper.
Four of the five answers listed below are functions of epithelium. Select the exception
a. absorption b. contracting c. covering d. lining e. secreting
Evolution can only occur in a population when _____
a. mating is random b. there is selection pressure c. neither is necessary
Which of the following is not a problem of deforestation?
1.It will reduce the future production of fossil fuels. 2.It reduces primary productivity by eliminating photosynthesizers. 3.It increases global warming by increasing radiation reflection. 4.It increases global warming through carbon dioxide liberation.