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
C) Unidirectional sodium and potassium channels open only toward the axon of the nerve cell.
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How might you alter the two bioassay procedures to provide more information? Describe and explain.
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. Molecular homologies indicate that living species evolved from a common ancestor or interrelated group of common ancestors. 2. Selective breeding results from programs designed to modify traits in domesticated species. 3. According to Thomas Malthus, food supplies tend to increase arithmetically while populations tend to increase exponentially, which means that populations will outgrow their food supply. 4. Neutral variation is supported by the observation that most changes in codons occur in the third position within the codon, which often has no effect on the sequence of amino acids in the protein.
In the classic study by Weingarten, the rats ________ each time the buzzer and light were presented during the test phase.
(a) exhibited conditioned fear (b) ate (c) avoided the food (d) vomited
Amoebae include microbes with
a. threadlike pseudopodia. b. eyespots. c. parabasal bodies. d. alveolata.