BRCA1 and p53 genes are classified as ____________________ genes. Fill in the blank(s) with the appropriate word(s)
ANSWER: tumor suppressor
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Which one of the following is not required for a plant to grow and reproduce?
A. hydrogen peroxide B. carbon dioxide C. water D. light E. basic nutrients
Which of the following events occurs in lung blood?
a. Free H+ binds to hemoglobin. b. Plasma HCO3 ? enters erythrocytes. c. In the plasma, CO2 and H2O are converted into HCO3 ? and H+. d. In erythrocytes, carbonic anhydrase converts CO2 and H2O into HCO3 ? and H+. e. CO2 binds to hemoglobin.
Which statement is TRUE?
A. Natural selection works on variation already present in a population. B. Individual organisms evolve structures that they need. C. Natural selection works on non-heritable traits. D. Individuals evolve through natural selection.
By definition, a direct parasitic life cycle includes two different species of hosts to complete its life cycle
a. true b. false