A population ecologist wants to estimate the size of a robin population. In an apple orchard, she captures 10 robins,
marks them, and then releases them. She returns several weeks later and captures another 10 robins, of which 2 are robins
she previously marked. The estimated population size of robins is ____.
a. 50
b. 15
c. 10
d. 200
e. 20
ANSWER: a
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Chemosynthetic bacteria are unique:
a. in not requiring CO2. b. because they use energy derived from chemicals. c. because they can produce food with low light. d. and are very common in the twilight depths. e. because many forms are also bioluminescent.
Which three of the following groups are most commonly used to covalently modify an enzyme and its activity? (Check all that apply.)
A. Methyl group B. Hydroxyl group C. Phosphoryl group D. Adenyl group
What biome includes an environment where the plants are low to the ground and many boggy areas are found?
A) a boreal forest B) a savanna C) a tundra D) a prairie
Nonpolar compounds are defined as ________ because they do not form bonds with water.
Fill in the blank(s) with the appropriate word(s).