What do you know about ice? How does it relate to the question?
What will be an ideal response?
Because ice has more rigid structure than liquid water it occupies more volume. Thus the same mass
of liquid water and ice vary in their density. Because liquid water occupies less volume it has a larger
density than ice. This is why ice floats on top of liquid water.
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Which of the following statements does NOT describe a function of the cell walls of bacteria?
A. They maintain cell shape. B. They prevent horizontal gene transfer. C. They avoid disintegration in water with low concentrations of salt. D. They protect against other bacteria. E. They protect against viruses.
Which of the following is the correct
complementary bonding of nitrogen containing bases in DNA?
a. adenine and cytosine. b. adenine and guanine. c. cytosine and thymine. d. guanine and cytosine. e. guanine and thymine.
Using PGD to screen for embryos that would become suitable donors for siblings is illegal under any
circumstance. Indicate whether the statement is true or false.
The half-life of a radioactive isotope is 10,000 years. This isotope and its breakdown product do not normally occur together before molten rock cools and becomes solid. You analyze a volcanic rock and find 25 percent of the original amount of
radioactive isotope remains, and 75 percent has decayed to its daughter element. How long ago did the rock solidify? A) 2,500 years ago B) 20,000 years ago C) 50,000 years ago D) 10,000 years ago