Which of the following is typical of cancer cells?
A. Products of oncogenes inhibit mitosis.
B. Benign tumors invade normal tissue.
C. Malignant cells migrate.
D. Cancer cells lose the ability to divide.
E. The parent cell of the tumor contains a single mutation in a single checkpoint gene.
Answer: C
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You are studying the synthesis of Molecule X in prokaryotes when you make the following observations: • When Molecule X is present in the prokaryotes’ environment, synthesis does not occur. • Molecule X synthesis increases when Molecule Z is present in the cell. • Molecule Z is never found outside of prokaryotic cells. Which statement can be supported by your observations?
a. Molecule Z is a repressor b. Molecule Z is an inducer c. Molecule Z is an activator d. Molecule Z is an operon
What type of evidence for the theory of common descent would include the presence of goose bumps in humans?
A) vestigial structures B) homologous structures C) shared developmental pathways D) DNA similarity
Contraction of the diaphragm ____.
A. diminishes the volume of the thoracic cavity B. increases the volume of the thoracic cavity C. pushes the rib cage downward D. causes external intercostal muscles to relax E. decreases lung capacity
Identification of bacteria in the laboratory usually begins with the ________ for placement in one of two large groups of bacteria
A) Koch's stain B) Gram stain C) Pasteur fermentation test D) Petri stain E) Ehrlich magic test