A scientist found an unweathered igneous rock that contained 0.025 g of potassium-40 and 0.075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. Using the table from figure 22.8 the age of the rock would be estimated to be
A. 2.6 billion years old.
B. 0.050 billion years old.
C. 1.3 billion years old.
D. 0.001875 billion years old.
E. 1.69 billion years old.
A. 2.6 billion years old.
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Your patient becomes sick due to an infection by the influenza virus and now has the flu. The cells which would most directly lyse virally infected host cells in this case are __________. These cells mature in the __________.
A. T cells; bone marrow B. B cells; thymus C. T cells; lymph nodes D. B cells; spleen E. T cells; thymus
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.
A haploid cell is a cell
a. in which the genes are arranged haphazardly. b. containing only one copy of each chromosome. c. that has resulted from the process of mitosis. d. with twice the number of chromosomes of a diploid cell. e. None of the above
Regarding the human sex chromosomes, which statement is correct?
A) X and Y are different in size but carry nearly equal numbers of genes. B) The X chromosome carries only gender-related genes. C) The X chromosome carries more genes than does the Y chromosome. D) The Y chromosome carries a greater number of genes than does the X chromosome. E) The X chromosome carries the genes for the development of male phenotype.