The main class of neurotransmitters involved in regulating mood in vertebrate animals is/are
A. the biogenic amines.
B. acetylcholine.
C. amino acids.
D. gases such as nitric oxide and carbon monoxide.
E. acetylcholine and amino acids.
A. the biogenic amines.
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How do sensory cells communicate different types of information to the brain—touch versus light for example?
A. by firing action potentials at different frequencies in the same neuron B. by firing action potentials of varying amplitudes in the same neuron C. by using different neurons for different stimuli (e.g., light and touch) D. by using different kinds of electrical signals in the same neuron as the information is conveyed to the brain E. by using different kinds of receptor potentials in the same neuron
Mutated versions of one or both of the genes BRCA1 and BRCA2 are associated with an increased risk of ________
a. breast cancer only b. lung cancer and pancreatic cancer c. both breast cancer and ovarian cancer d. lymphoma only
Vascular tissue that transports organic nutrients and sugars from the leaves to the roots is
A. phloem. B. cambium. C. xylem. D. periderm. E. sclerenchyma.
The first tetrapods evolved ____.
A. on land B. after the amphibians C. from lobe-finned fish D. after the first amniotes E. from the ray-finned fishes