Mutations in the proto-oncogene ras and the tumor-suppressor gene p53
A) increase protein synthesis by the cell.
B) can improve the chance of avoiding cancer as one ages.
C) can enhance further mutations, which can develop into cancer.
D) disrupt normal regulation of the cell cycle.
Answer: D
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This pigment is responsible for the red-yellow coloration seen in leaves during the color change in autumn.
A. chlorophyll a B. chlorophyll b C. carotenoids D. porphyrin E. phytol
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Which sequence most accurately describes the
complete path of blood through the circulatory system of a fish? a. atrium >>> ventricle >>> gill capillaries >>> atrium >>> ventricle >>> all other capillaries b. atrium >>> ventricle >>> gill capillaries c. gill capillaries >>> atrium >>> ventricle >>> all other capillaries d. gill capillaries >>> all other capillaries >>> atrium >>> ventricle e. none of these