Temperature increases due to global warming have been greatest ________
A) close to the poles
B) in the sea
C) in the tropics
D) in deserts
A
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The pores through which leaves exchange atmospheric gases with leaf cells during photosynthesis are the
A. sieve tube elements. B. guard cells. C. stomata. D. epidermal cells. E. petioles.
Which of the following prevents muscle contraction by regulating the interaction between the
myofilaments? a. the troponin-tropomyosin complex b. actin c. actomyosin d. phosphate e. myosin
When the homologous chromosomes separate during meiosis I, each daughter nucleus receives
What will be an ideal response?
A research strain of mice has a mutation that causes voltage-gated sodium channels to take longer to return to the active state after a spike. What is the likely consequence for transduction of sensory stimuli?
A. Sensory information will be incorrectly perceived as high intensity stimuli, due to the increased frequency of action potentials. B. There will be no effect on sensory perception, because sensory information relies on stimulus-gated ion channels and not voltage-gated ion channels. C. Due to a longer refractory period, the neuron will be unable to conduct high-frequency action potentials and thus will not effectively transmit information about strong stimuli. D. The mutation will interfere with the ability of stimuli to create receptor potentials, and thus the neuron will fire with slow, broad action potentials, giving the animal enhanced sensory perception.