The recent reassessment of animal classification is the result of
A. new, genetically engineered species.
B. developing resistance to antibiotics.
C. comparison of molecular data.
D. new data from Carl Linnaeus.
E. new morphological data.
Answer: C
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Tiny filaments called ______ increase the surface area of a brush border cell
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The universal regulatory mechanism in eukaryotes for controlling gene expression includes
A. control of the processing of mRNA after it is transcribed from DNA but before it leaves the nucleus, and control of the rate it leaves the nucleus. B. control of the genes transcribed and the rate they are transcribed. C. control of mRNA in the cytoplasm after it leaves the nucleus, including changes to mRNA before translation begins. D. control of polypeptides after they have been synthesized but before they are functional. E. All of these mechanisms are used; there is no single universal mechanism.
________ water is a slowly exchanging pool, and once it becomes polluted it is difficult to clean up
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Which of the following is TRUE regarding osmosis?
a. the relative concentrations of solutes inside and outside the cell have no influence on osmosis b. if a cell is in a hypotonic solution, water will leave the cell c. if a cell is in an hypotonic solution, no water will move across the cell membrane d. if a cell is in a hypertonic solution, water will leave the cell