Four of the five answers listed below reflect how humans have disturbed the balance of the global nitrogen cycle
Which is the exception?
a. use of fertilizer
b. combustion of fossil fuels
c. airplane travel
d. coal-fired power plants
e. overuse of refrigerants
e
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Live birth is characteristic of:
a. marsupials only b. monotremes only c. placentals only d. marsupials and placentals e. birds only
One characteristic of continuous variation is that ____
a. traits are usually quantified by counting b. only a single gene pair contributes to the phenotype c. individual genes have a large effect on the phenotype d. phenotypic expression varies across a wide range e. it is best analyzed in individuals rather than in populations
What is telomerase?
A. an enzyme that adds bases back to the tip of chromosomes every time a cell divides B. a chemical that allows the telophase stage of mitosis to proceed C. a chemical involved in RNA synthesis D. an enzyme that inhibits the formation of small blood vessels that feed a tumor E. a protein found in abundance on colon cancer cells
What is a good estimate of the current rate of species extinction?
A) one species per day B) one species per year C) one species per millennium D) one species per million years