Which of the following is not a characteristic of Saccharomyces cultures?
a. The cells are haploid.
b. The cells have a relatively short generation time.
c. Cells reproduce asexually by budding.
d. The cells can be induced to reproduce sexually.
e. All answers are true of Saccharomyces cultures.
E
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In which of the following regions is the smallest percentage of the work force engaged in primary activities?
A) South America B) North America C) Africa D) Asia E) Caribbean
If body cells have too few receptors for insulin, ________
A) the insulin level is likely to decrease B) the blood glucose level may rise to abnormal levels C) the liver will need to break down more glycogen D) more glucagon will be needed
Which of the following cannot be infected by viruses?
a. algae b. bacteria c. animals d. all of these can be infected by viruses
Dinoflagellates are important to coral and coral-dwelling animals because they
A) provide energy in the form of organic molecules that is used by coral animals. B) provide shelter for the fast-growing seaweeds associated with coral. C) produce carbon dioxide (CO2 ) and nitrogen for coral. D) are toxic to species that prey on reef-dwelling fish.