A(n) (acidic/metallic/fluorescent) molecule is one that absorbs invisible radiation and emits visible light.
Fill in the blank(s) with the appropriate word(s).
fluorescent
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As a result of the way nerve impulses are propagated, they are unidirectional. Which of the following does not contribute to this phenomenon?
A) The time interval encompassed by the refractory period does not allow the impulse to travel in reverse. B) Presynaptic neurotransmitters and postsynaptic receptors are separated. C) Unidirectional sodium and potassium channels open only toward the axon of the nerve cell. D) Sensory processes are oriented in such a manner that the information is targeted to the dendrites of the nerve cell. E) none of the above
The goal of eugenics is to ____
a. select the most desirable human characteristics b. eliminate genetic disorders that reach a certain threshold in terms of their costs to individuals and society c. produce genetically identical humans. d. eliminate genes for abnormal behavior. e. produce genetically perfect people.
Some invertebrates do not have special respiratory organs and rely on __________ exchange, which involves the
diffusion of gases across the body surface. Fill in the blank(s) with the appropriate word(s).
How do fossils support the theory of common descent?
A) They are a record of some intermediate types of organisms that document the process of evolution. B) They can be easily and precisely dated by comparing the rock layers where they are found. C) They are found equally all over the world, so they explain all our questions about biogeography. D) They contain complete DNA genomes, so they can be compared to modern organisms.