The human population on Earth is expected to reach 9.7 billion people by

A) 2015.
B) 2050.
C) 2093.
D) 3150.


Answer: B

Biology & Microbiology

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Trimming a shrub will make it become more bushy (have more lateral growth) primarily due to a reduction in the

amount of ____.

a. auxin b. ethylene c. abscisic acid d. gibberellin e. cytokinin

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Answer the question using the accompanying figure. The worker bees represented by letters E and F, which receive

the same alleles from the queen, are related to each other by ____.

a. 50% b. 75% c. 0% d. 100% e. 25%

Biology & Microbiology

Tree rings represent growth during wet and dry periods of the year. In a deciduous tree found in the north, which two seasons would contribute to tree rings?

A. summer and fall B. winter and summer C. winter and spring D. spring and fall E. spring and summer

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Monozygotic twin concordance values are less than 100% in both bipolar disorder and schizophrenia. This suggests

that these disorders ____. a. are strictly polygenic b. have environmental components c. are X-linked d. genetically dominant e. are not genetically based

Biology & Microbiology