A section of a neuron's membrane becomes temporarily positive on the inside when:
A) ion channels open and potassium ions rush in. B) negatively charged proteins exit the cell.
C) neurotransmitters enter the cell. D) ion channels open and sodium ions rush in.
Answer: D
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If you isolate a pancreatic beta cell and put it in the proper growth conditions, it will divide by mitosis and produce new beta cells, but it will not produce pancreatic alpha cells or pancreatic cells that release digestive enzymes. The pancreatic beta cell is
A. totipotent B. impotent C. unipotent D. multipotent E. pluripotent
Which of the following is a characteristic of the oceanic zone?
a. numerous phytoplankton b. high nutrient content c. sand, silt, and dead organisms d. significant algal bloom
Animals that select mates that are phenotypically similar will have ________ when compared with Hardy-Weinberg predictions.
A. more homozygotes. B. more mutations C. more heterozygotes D. less natural selection E. fewer homozygotes
Whose work proved conclusively that spontaneous generation of life from nonlife was not possible?
A. Georges Cuvier B. Walther Flemming C. John Ray D. Louis Pasteur E. Charles Darwin