Which of the following statements is false?
A. Circulation requires a pump to generate
pressure to drive flow, whereas ventilation
does not.
B. Ventilation maximizes the concentration of
oxygen in the air on the outside of the
respiratory surface.
C. The same amount of oxygen enters the
blood through diffusion as is transported by
circulation.
D. Oxygen and carbon dioxide both move
across the respiratory surface by diffusion.
E. Larger, more complex animals rely on bulk
flow and diffusion to deliver oxygen to their
cells, whereas some simpler animals rely on
diffusion alone.
A
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In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.
Cells very similar to choanoflagellates are
found in: a. Land plants b. Sponges c. Mold d. Bacteria e. None of these
Four of the five answers listed below are fat soluble vitamins. Select the exception
a. vitamin A b. vitamin C c. vitamin D d. vitamin E e. vitamin K
How many sperm cells are produced for every one primary spermatocyte?
A. 8 B. 2 C. 4 D. 12