The animal in the above diagram has
a. an open circulatory system.
b. no capillaries.
c. a closed circulatory system.
d. spaces in the tissues for blood to pool in.
e. none of these
C
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Which statement best sums up our understanding of how animals navigate during migration?
A. The mechanisms have been worked out in great detail, from the genes involved, to the brain structures, to the resulting behavior. B. We have a thorough understanding of orientation but not navigation. C. We have some understanding of the information different animals rely on (sun, stars, or magnetic fields), and some sensory structures, but beyond that the mechanisms are still mysterious. D. Animal navigation is a complete mystery.
Cells that have membrane-bound organelles and cytoplasm are classified as ________ cells
Fill in the blank(s) with correct word
Master genes that affect development tend to be highly ____; therefore, similarities in patterns of embryonic development reflect shared ancestry that can be evolutionarily ancient.
a. homologous
b. degraded
c. conserved
d. mutated
e. related
If a researcher used Escherichia coli DNA polymerase instead of Thermus aquaticus DNA polymerase in the PCR procedure, what would be the result?
A. DNA replication would occur more slowly than normal. B. DNA replication would not occur at all. C. Many mistakes would occur. D. DNA replication would occur twice as fast as normal. E. DNA replication would stop after one cycle.