The EIA test for HIV infection is a direct test for HIV envelope proteins
Indicate whether the statement is true or false.
Answer: FALSE
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Which of the following is not a mechanism by which viruses cause cancer?
A. An expression of viral proteins results in abnormal expression of genes that regulate cell growth and reproduction. B. They carry a cancer-causing gene into the cell. C. They encode proteins that bind to and inactivate host cell proteins known as tumor suppressor proteins. D. They produce defective interfering particles.
New combinations of genetic material give rise to genetic variability in sexually reproducing organisms through
A) crossover events between nonsister homologous chromatids. B) crossover events between sister chromatids. C) egg and sperm genetic recombination from distinct individuals. D) egg and sperm genetic recombination from one individual in which crossing over and independent assortment of homologues has occurred. E) A, C, and D all contribute to genetic variability.
Which of the following examples in wildlife conversation efforts is related to genetic drift?
A. Increasing the population size may negatively affect the populations overall fitness. B. The prevalence of deleterious alleles begin to stabilize within a reduced population. C. The genetic differences between separate populations of a species begin to equal one another. D. If populations become too small, alleles can potentially disappear in that population.
Changes at the molecular level can turn proto-oncogenes into oncogenes. These changes cause unregulated cell division. Which disease is caused by this transformation?
A. diabetes B. leukemia C. pneumonia D. hemophilia