Approximately __________ percent of lung cancers
occur in smokers.
a. 20
b. 40
c. 60
d. 80
e. 100
Answer: d
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Economists have been comparing the monetary value of intact habitats with the value of using (destroying) those habitats (such as for logging or farming). They find
A. the immediate economic gain is worth it, such as in the shrimp farms in Thailand. B. the long-term problems are minimal, and usually economically minor, it is more of an aesthetic problem than a monetary one. C. the intact habitat is more valuable than the destroyed one in most cases studied. D. clearing the forest for agriculture, as in Cameroon, provides jobs, housing, and long-term economic benefits. E. increased invasion in intact habitats renders it worthless within a few years.
Among other functions, the ____ of a vascular plant performs most of the photosynthesis that is
conducted by the plant.
a. ground tissue b. protoderm c. vascular tissue d. meristem e. dermal tissue
If fertilization occurs, the seed will develop
from the
a. gametophyte. b. ovary. c. ovule. d. pollen grain. e. zygote
Virginia was working as an undergraduate lab technician, and the graduate student she was working with instructed her to take some E. coli, and treat the culture with MgCl2 and CaCl2 to make the cells competent. Once Virginia produced the competent cells, she was able to
A. make them susceptible to bacteriophage B. make them pass their DNA to a recipient cell via conjugation C. make them take up naked DNA from their environment D. make them replicate their own DNA without an origin of replication E. None of the answers are correct.