Which codons specify the amino acid lysine (lys)?
1.UUU and UUC
2.AGA and AGG
3.AAU and AAC
4.AAA and AAG
4
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What information would best help you distinguish what type of sensation a sensory neuron transmits?
A. the rate of action potential firing B. the proteins it expresses most abundantly C. the part of the brain it transmits signals to D. the amplitude of action potentials E. the diameter of the axon Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about sensory neurons? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Sympatric speciation occurred in the cichlid fishes within the same lake in Africa. How could this occur without physical separation?
What will be an ideal response?
Which best describes the role of neurotransmitters in behavior?
A. In specific ecological contexts, neurotransmitters can be important for behavior. For instance, aggression requires the neurotransmitter serotonin. B. Some specific behaviors will require neurotransmitters. For instance, aggression requires the neurotransmitter serotonin. C. Neurotransmitters allow neurons to communicate, and are thus involved in all behaviors. Levels of specific neurotransmitters have been associated with levels of specific behaviors -- such as serotonin and aggression. D. Neurotransmitters have been developed for researchers who want to manipulate animal behaviors. For instance, serotonin can be applied to lobsters to increase aggression.
Which of the following statements is NOT
generally characteristic of parasites? a. They are specialists and usually are able to affect only one variety of hosts. b. They inflict serious injury and kill their hosts. c. Some reside inside their hosts, whereas others live outside their hosts. d. Their host may be a plant as well as an animal. e. Plants as well as animals can be parasites