Answer the following statements true (T) or false (F)
1. Research suggests a link between a mutation in the skin protein filaggrin and allergic reaction.
2. Vaccinating a substantial portion of the population against an infectious disease establishes "herd immunity."
3. Mitosis in a cancer cell can be compared to a runaway train that is racing along without signals and control points.
4. Invasive malignant tumors typically contain mutations that affect the cytoskeleton and allow the cell to move from where it is anchored.
5. Research has shown that a "cocktail" of several drugs, each acting on a different cellular pathway, is the best approach to treat many cancers.
1. True
2. True
3. True
4. True
5. True
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Examine Figure 21.14. If you wanted to use a molecular clock to date a relatively recent divergence event—say, one that occurred in the last 100 million years or so—which of the four types of genes would make the best clock? Why?
A. Fibrinopeptides, because they have changed the most over that time period. B. A histone gene, because it has changed relatively little over that time. C. Fibrinopeptides, because they have changed relatively little over that time. D. A histone gene, because it has changed the most over that time period. E. Hemoglobin, because of its moderate rate of change.
How can crop yields be increased?
A. All of the answer options are correct. B. converting more land to agricultural fields C. increasing the use of fertilizers to replenish nutrient-depleted soil D. increasing the use of machinery to harvest crops E. using genetically modified crops that are more resistant to disease
The ____ is the largest organ in the human body
a. brain b. lungs c. liver d. stomach e. skin
Which statement is NOT true of the T cells?
A. T cells require presentation of antigens by macrophages before they are able to recognize the antigen. B. T cells change into plasma cells and produce antibodies when stimulated. C. T cells mature in the thymus. D. T cells carry receptor molecules on their cell surfaces.