A PET scan can be used to monitor ________ when a person is performing specific _______ tasks
a. brain activity; physical
b. glucose activity; physical
c. brain activity; mental
d. hemoglobin activity; mental
e. hemoglobin; physical
C
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Which of the following is the term for a ball of undifferentiated cells that results from repeated mitosis of a fertilized ovum?
A. cleavage B. blastula C. gastrula D. endoderm
The products of the C4 cycle
a. are immediately used in CAM plants. b. are stored by CAM plants in the central vacuole. c. are stored by CAM plants in the stroma. d. diffuse to bundle sheath cells for immediate use in C4 plants. e. are stored in mesophyll cells of C4 plants.
________ prevent hybrid offspring from developing or if the hybrid is born, it is infertile.
A. Two of these are correct. B. Prezygotic reproductive isolating mechanisms C. Temporal isolation mechanisms D. Postzygotic isolating mechanisms E. None of the answer choices are correct.
You are studying populations of a certain species of frog in two ponds five kilometers apart. There are no other ponds in the area. In pond A all the frogs are small and have a few black spots on them. In pond B most of the frogs are large and lack spots but a few are small without spots and a few are large with spots. Which of the following is the most likely cause of the genetic diversity seen in pond B?
A. The small frogs and spotted frogs in pond B are mutations. B. Pond A frogs resulted from individuals migrating from pond B. C. The small frogs and spotted frogs in pond B probably are the result of some frogs migrating from pond A to pond B. D. Meiosis generated more genetic diversity in pond B than in pond A.