If a cell's p53 genes are inactivated, the cell
a. loses control over cell division.
b. no longer makes proto-oncogenes.
c. stops dividing.
d. activates tumor suppressors.
Answer: a. loses control over cell division.
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BRCA1 and BRCA2 are considered to be tumor-suppressor genes because _____
A) they prevent infection by tumor viruses that cause cancer B) their normal products participate in repair of DNA damage C) the mutant forms of either one of these prevent breast cancer D) the normal genes make estrogen receptors E) they block penetration of breast cells by chemical carcinogens
Which of the following statements is not true of homologous chromosomes?
1.They contain the same genes at the same loci.
2.They contain the same alleles at the same loci.
3.Typically, one is paternal and one is maternal.
4.They may exchange portions during meiosis.
Which statement describes the expected population growth in the next 50 years?
A) The population growth will be relatively equal throughout the world. B) The greatest population growth is likely to occur in the more industrialized countries, including the United States and Europe. C) Most countries worldwide will achieve zero population growth in the next 10 years. D) The greatest population growth is likely to occur in the least industrialized countries. E) There will be a net decline of population, with the United States and other industrialized countries contributing most to the population decline.
A strain of Neisseria gonorrhea has a mutation which has caused it to lose the ability to produce fimbriae and become less virulent as a consequence. What function has this pathogen lost?
A. the ability to adhere to cells of the body B. the ability to move from one location in the body to another C. the ability to produce an endotoxin D. the ability to establish a latent infection E. the ability to prevent phagocytes killing it