Individuals with severe combined immunodeficiency syndrome (SCID) have a genetic defect that prevents proper formation and expression of immunoglobins and T cells and therefore do not have adaptive immunity
Indicate whether the statement is true or false.
Answer: TRUE
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Which of the following is most likely to occur when a tumor-suppressor gene is mutated?
A. The tumor-suppressor gene may be overactive. B. The resulting tumor-suppressor protein would further suppress cell proliferation. C. The resulting tumor-suppressor protein would activate an oncogene. D. The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. E. None of the choices are possible.
The most severe mass extinction occurred at the end of the Permian Period
a. True b. False
Give an explanation of three reasons why angiosperms are so diverse and widespread
What will be an ideal response?
Which of the following is the closest living
relative to a bird?
a. lizards b. alligators c. bats d. dinosaurs e. winged insects