Fleas feed on the blood of dogs, cats, and people. What is this ecological relationship called?
A) Competition
B) Predation
C) Parasitism
D) Mutualism
E) Resource partitioning
C
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Which molecule is our primary source of
energy?
a. protein b. fatty acids c. carbohydrates d. nucleic acids e. triglycerides
Which method of bacterial DNA transfer involves a physical connection between the two bacterial cells?
A) Transformation B) Transduction C) Binary fission D) Conjugation
The Brazil nut tree, Bertholletia excels (n = 17), is native to tropical rain forests of South America. It is a hardwood tree that can grow to over 50 meters tall, is a source of high-quality lumber, and is a favorite nesting site for harpy eagles. As the rainy season ends, tough-walled fruits, each containing 8-25 seeds (Brazil nuts), fall to the forest floor. Brazil nuts are composed primarily of endosperm. About $50 million worth of nuts are harvested each year. Scientists have discovered that the pale yellow flowers of Brazil nut trees cannot fertilize themselves and admit only female orchid bees as pollinators. The agouti (Dasyprocta spp.), a cat-sized rodent, is the only animal with teeth strong enough to crack the hard wall of Brazil nut fruits. It typically eats some of the seeds,
buries others, and leaves still others inside the fruit, which moisture can now enter. The uneaten seeds may subsequently germinate. Orchid bees are to Brazil nut trees as ________ are to pine trees. A. breezes B. rain droplets C. seed-eating birds D. squirrels E. both seed-eating birds and squirrels
During mammalian development, a
A) blastula becomes a zygote. B) morula becomes gastrula. C) zygote becomes a blastula. D) gastrula becomes a morula. E) morula becomes a blastula.