Which of the following is/are true about endotoxins?
A. Lipid A is the toxic portion of the molecule.
B. The toxic effects depend on the bacteria from which it came.
C. The lipid A is immunogenic.
D. They are proteins.
E. The toxic effects depend on the bacteria from which it came AND they are proteins.
A
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Which of the following occurs during prophase?
A) Chromosomes line up on the midline of the cell.
B) The nuclear envelope forms.
C) Sister chromatids separate.
D) The mitotic spindle begins to form.
Survivin is an apoptosis inhibitor in humans. If the survivin gene is mutated so that it produces too much of the survivin protein, which of the following would be the most likely effect on limb formation?
A. Mitosis of the limb bud cells would not occur. B. Cells would not migrate to their correct position. C. Cell determination would not occur. D. Cell differentiation would not occur. E. Webbing between digits would not be removed.
Gingko trees are known to lose their leaves at a certain time each year throughout the United States. Based on this information, Gingko trees in China must behave the same way. These statements are an example of:
A. inductive reasoning B. deductive reasoning C. a theory D. an experiment
Which of the following statements concerning hydrocarbons is false?
A) Octane is a hydrocarbon. B) Hydrocarbons are insoluble in water. C) Hydrocarbons are the most abundant organic molecules in cells. D) Only hydrogen atoms are used to complete the valence requirements of carbon in hydrocarbons. E) Phospholipids have hydrocarbon tails.