While some people love cilantro, others think it tastes like soap. This is due to a mutation in a receptor that binds to
the airborne aldehydes found in cilantro. Which type of receptors is most likely affected by this mutation?
a. nociceptors
b. thermoreceptors
c. chemoreceptors
d. mechanoreceptors
e. photoreceptors
ANSWER: c
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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
The analysis of energy flow in an aquatic ecosystem in Silver Springs, Florida revealed that ____
a. energy flows are difficult to measure b. most of the sun's energy is harvested c. only a little energy is transferred from one trophic level to the next d. the energy flow in carnivores is equal to that of producers e. trophic energy losses are not significant
Phytoestrogens in plants ____
a. increase the production of megaspores b. function in the production of eggs c. increase the speed at which pollen tubes reach the egg d. aid in the nuclear fusion of egg and sperm e. have nothing to do with plant reproduction
If an individual has the A blood type, how many different genotypes can they possess?
A. four B. one C. five D. three E. two