A number of studies have found that for many plants there is an increase in seed production under conditions of elevated carbon dioxide levels. What is a likely explanation for this phenomenon?
A) The energy needed to produce seeds comes from carbon dioxide.
B) The carbon needed to produce new plant molecules through photosynthesis requires carbon dioxide.
C) Increased carbon dioxide levels cause increased cell respiration, which is needed to produce more seeds.
Answer: B
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As diffusion plays a large role in determining the size of bacterial cells, bacteria are often shaped like which of the following?
A. spheres B. spirals C. filaments D. rods E. All of these answer options are correct.
Which of the following is NOT related to genetic drift?
A. Founder effect. B. Bottleneck effect. C. Sexual selection. D. Both the founder effect and the bottleneck effect. E. Both sexual selection and bottleneck effect.
The rapid increase in the population of Canada geese in the United States can be primarily attributed to ____
a. an increase of crop predation b. a decrease in avian diseases c. the suspension of hunting geese for many years d. an increase in wetlands e. an increase in the number of nonmigratory geese
Which of the following organisms is not capable of causing meningitis?
A) Neisseria meningitidis B) Haemophilus influenzae C) Cryptococcus neoformans D) Streptococcus pneumoniae E) None of the above