How are visual receptors different from other sensory neurons?
a. Visual receptors have no refractory period.
b. Visual receptors transmit information with electrical charges.
c. Visual receptors become hyperpolarized when stimulated.
d. Visual receptors retain memory of recent stimuli.
c. Visual receptors become hyperpolarized when stimulated.
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Herpesviruses can cause all of the following diseases in humans EXCEPT
A) cancer. B) chicken pox. C) cold sores. D) spongiform encephalopathy.
A patient has a stroke that leaves him without any impulse control. Where is the most likely location of the brain
damage?
a. limbic association cortex b. prefrontal association cortex c. Wernicke's area d. occipital cortex e. somatosensory cortex
Red blood cells
a. have a large nucleus when they enter circulation. b. do not have a nucleus when they enter circulation. c. are the only cells to lack hemoglobin. d. develop in the yellow marrow. e. fit more than one of these descriptions
Coat color in one breed of mice is controlled by
incompletely dominant alleles so that yellow and white are homozygous while cream is heterozygous. The cross of two cream individuals will produce a. all cream offspring. b. equal numbers of white and yellow mice, but no cream offspring. c. equal numbers of white and cream mice. d. equal numbers of yellow and cream mice. e. equal numbers of white and yellow mice, with twice as many creams as the other two colors.