The portion of the nervous system that most directly controls skeletal muscles is the:
A) afferent.
B) sympathetic.
C) autonomic.
D) somatic.
E) parasympathetic.
Answer: D
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It is thought that the oldest stage of cellular respiration from an evolutionary perspective is
A. the krebs cycle. B. the electron transport chain. C. fermentation. D. glycolysis.
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.
Four of the following might be a response to rising body temperature. Which one is the exception?
a. increased rate of breathing b. decreased secretion of certain hormones c. more sweat d. reduced blood flow to skin e. increased rate of breathing
An organism that requires chemical nutrients which serve as final electron acceptors is a(n)
A) chemotroph. B) phototroph. C) lithotroph. D) autotroph. E) aerobe.