How might absorption of organic compounds into clays assist in their aggregation and organization
into membrane-bound protocells?
a. Clays contain many minerals in extremely thin layers and readily repel ions, forcing
multiple chemical interactions.
b. Clays are highly structured, contain water, and store potential energy that could drive the
chemical reactions forward.
c. Clays lack water, forcing the concentration of the organic molecules and thus driving
multiple interactions.
d. Clays are extremely resistant to temperature changes and thus would insulate the organic
compounds from temperature changes in the atmosphere.
e. None of the above statements accurately explain clays’ possible roles in the formation of
protocells.
B
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Explain how proteins that are produced in a cell are correctly directed to the cytosol, the endomembrane system, and
the mitochondria.
What will be an ideal response?Four of these five choices are global consequences of warmer temperatures. Select the exception
a. rising sea levels b. more intense hurricanes c. periods of drought d. periods of heavy precipitation e. some species shifting ranges to lower latitudes and elevations
Why is DNA able to store large amounts of information?
a. It contains a large number of different nucleotides. b. Its nucleotides can be arranged in a large number of possible sequences. c. It is capable of assuming a wide variety of shapes. d. The sugar and phosphates can be arranged in many different sequences. e. The nucleotides can be altered to form many different letters in the sequence.
Which method of inserting DNA into cells is illustrated in Figure 8.1?
A. protoplast fusion B. injection C. electroporation D. a gene gun E. transduction