Explain how a benign growth in the colon can become a malignant tumor. What will be an ideal response?
ANSWER: Normal colon cells may turn into a small adenoma or benign growth if there is a loss of a
tumor suppressor gene or some other DNA mutation. The small adenoma can grow into a
larger growth if an oncogene becomes activated or a second tumor suppressor gene is lost. If
a third mutation occurs the adenoma can become a malignant growth. Viruses, carcinogens,
radiation or compromised immunity can lead to these DNA mutations.
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The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
a. near the radio emission of water. b. near the radio emission of oxygen molecules. c. between the radio emissions of hydrogen and oxygen. d. between the radio emissions of hydrogen and OH. e. near the radio band where water in the Earth's atmosphere strongly absorbs energy.
Cnidarians are
A. aquatic animals. B. Both land-dwelling animals and aquatic animals are correct. C. land-dwelling animals. D. arboreal animals. E. Both land-dwelling animals and arboreal animals are correct.
Which of the following types of work involves a change in position of the cell or a cell structure?
A) bioluminescent B) electrical C) mechanical D) synthetic E) concentration
Nephelometry measures the light scatter of
a. Ions b. Macromolecules c. Antibodies d. Soluble antigens e. All of the above