Assimilation of organic phosphates from the surroundings uses enzymes known as ________.
A. phosphorylases
B. phosphosynthetases
C. phosphatases
D. phosphoisomerases
Answer: C
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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.
In some species, the sex of the future individual is determined by environmental conditions and not by sex chromosomes. Which species determines its sex by temperature?
a. birds b. fruit flies c. frogs d. rabbits e. zebras
The skin and nervous tissues develop from which germ layer?
A) Protoplasm B) Endoderm C) Ectoderm D) Mesoglea E) Mesoderm
Which process is directly used by autotrophs to produce glucose
a. diffusion b. photosynthesis c. respiration d. active transport