Gel electrophoresis is a technique that takes advantage of what property of DNA?
(a) Gel electrophoresis moves DNA across a gel through hydrophobic interactions of the hydrogen bonds
(b) Gel electrophoresis moves DNA across a gel because DNA has a negative charge
(c) Gel electrophoresis moves DNA across a gel through hydrophilic interactions of the hydrogen bonds
(d) None of the above are true
Answer: (b) Gel electrophoresis moves DNA across a gel because DNA has a negative charge
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A karyotype reveals that an individual is XYY. Based on your knowledge of human genetics, you correctly conclude
that this individual has ____, and is a phenotypically _____. a. Turner syndrome; sterile female b. Turner syndrome; fertile female c. Klinefelter syndrome; sterile male d. Klinefelter syndrome; fertile male e. XXY karyotype; fertile male
The classic "Miller experiments," performed in the 1950s by Harold Urey and Stanley Miller, were the first to show that:
A. the average bill size of a population of Darwin's finches changed with environmental conditions, proving that microevolution can occur within a human lifetime. B) simple organic molecules, such as amino acids, could form spontaneously in the laboratory under chemical conditions mimicking those of primitive earth. C. natural selection could occur in a petri dish within a population of bacteria known to have differential abilities to digest complex sugars. D. water (H2O) could be separated into atmospheric oxygen and H2 gas.
The temperature-regulating center of vertebrate animals is located in the _____
A) thyroid gland B) hypothalamus C) subcutaneous layer of the skin D) liver
Table salt forms from sodium and chloride via hydrogen bonding.
Answer the following statement true (T) or false (F)