What is the term for mutant alleles that can act dominantly to predispose a cell to a cancerous phenotype?
A) Polymerases
B) Oncogenes
C) Activators
D) Tumor-suppressor genes
B) Oncogenes
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A somatic mutation
A) occurs only in microbes. B) affects a particular subset of cells. C) affects all cells of an individual. D) is expressed only in embryos.
Enzymes catalyze a reaction by
A. increasing the activation energy of the reaction. B. decreasing the amount of energy released by the reaction. C. decreasing the activation energy of the reaction. D. increasing the amount of energy released by the reaction.
If our bodies are capable of secondary responses, how do people contract influenza more than once?
a. Memory cells lose their ability to recognize antigens after six months. b. The affinity of antibodies diminishes in the secondary response. c. New varieties of flu virus continuously evolve. d. Our bodies cannot launch a strong enough immune response against the flu virus. e. There are no effective vaccinations for the flu.
How many oxidation reactions occur during the Citric acid cycle?
A. 2 B. 9 C. 6 D. 4 E. 1