How is osmosis different from simple diffusion?
a. Water cannot pass freely across the membrane.
b. Water requires energy to move across a cytoplasmic membrane.
c. Water movement is driven by the concentration of solutes rather than its own concentration.
d. Water requires a special permease.
Answer: c. Water movement is driven by the concentration of solutes rather than its own concentration.
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The realized niche of Semibalanus is
A. bigger than its fundamental niche. B. the same as its fundamental niche. C. the same as that of Chthamalus. D. smaller than its fundamental niche.
Which of the following would not be seen in a cross-section through the woody part of a root?
a. sclerenchyma cells b. parenchyma cells c. sieve-tube elements d. root hairs e. vessel elements
Considerably more phenotypic variation exists in domesticated varieties of species like dogs and cabbages than exists in non-domesticated species like lions and maple trees. Which one of the following statements best explains why this is true?
A. Genetic drift is important because domestication involves small populations. B. Many domesticated varieties would not survive in the natural world. C. There is no selection and mating is random under domestication. D. Domesticated species exhibit "hybrid vigor" (heterosis). E. During domestication, very high rates of mutation are induced.
Which is a genetically modified organism but not a transgenic organism?
A) Flavr Savr peaches (peaches that express larger quantities of a peach stability enzyme) B) Golden Rice (rice that expresses daffodil and bacteria beta-carotene synthesis enzymes) C) AquAdvantage salmon (Atlantic salmon that expresses Chinook salmon growth hormone) D) Roundup Ready soybeans (soybeans that express bacterial pesticide enzymes)