The number of animal species now known is about
A. 10 million.
B. 100 million.
C. 1 million.
D. 15 million.
E. 5 million.
C. 1 million.
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Which process explains the evolution of mitochondria and chloroplasts in eukaryotes?
a. Endosymbiosis b. Transformation c. Conjugation d. Transduction
Infections by Helicobacter pylori cause 90% of peptic ulcers in the United States. These bacteria have pili that are only expressed in acidic conditions. A characteristic of this organism should be an ability to
A. avoid ingestion by cells in the immune system. B. enter the bloodstream. C. attach to cells in the host organism's stomach. D. induce a large antibody response. E. move in the direction opposite the pili.
Which type of RNA is used as a template for translation of proteins?
A. messenger RNA B. micro RNA C. transfer RNA D. ribosomal RNA
Genetic engineering of animals is done for the following benefits except
A. the production of human gene products for medical therapies. B. the preservation of endangered animal species. C. faster growth of food animals. D. research into genes that cause genetic disorders in humans. E. disease resistance in food animals.