In temperate-zone lakes, spring and fall _______ cause vertical mixing of waters and trigger a burst of productivity.
Fill in the blank(s) with the appropriate word(s).
overturns
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Which is the correct order of cytoskeletal filaments in decreasing filament diameter?
A. microfilaments > microtubules > intermediate filaments B. microtubules > intermediate filaments > microfilaments C. microtubules > microfilaments > intermediate filaments D. intermediate filaments > microfilaments > microtubules
Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes. Which statement is true?
A. Antibodies produced by the cells can more effectively kill the bacteria. B. The bacterium can survive and replicate inside of the phagocytic cell. C. The bacterium can produce chemicals which can destroy the macrophage housing the bacterium. D. Complement proteins will take over to destroy the bacteria.
Genetic recombination is possible because of ________ during or after meiosis.
A. independent assortment B. fertilization with a nonrelated gamete C. crossing over D. All of these are correct.
How are the tails and heads of membrane phospholipids oriented in their environment?
A. The hydrophobic heads are oriented toward each other and the hydrophillic tails are oriented toward the extracellular fluid and the intracellular fluid. B. The hydrophillic heads are oriented toward each other and the hydrophobic tails are oriented toward the extracellular fluid and the intracellular fluid. C. The hydrophillic tails are oriented toward each other and the hydrophobic heads are oriented toward the extracellular fluid and the intracellular fluid. D. The hydrophobic tails are oriented toward each other and the hydrophillic heads are oriented toward the extracellular fluid and the intracellular fluid.