The muscles and nervous system of the fetus become mature enough for movement to occur by the ________ month of development
A) fifth
B) first
C) eighth
D) third
E) seventh
A
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In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin. Which of the following descriptors does not apply to Trichophyton?
A. Saprobe B. Parasite C. Eukaryote D. Heterotroph
During a relative refractory period, ____
a. an axon can transmit impulses comparable to a resting neuron. b. an axon cannot transmit an action potential. c. an axon can transmit impulses, but the threshold level is higher. d. an axon can transmit impulses, but the threshold level is lower. e. all voltage-activated sodium channels are inactivated.
Martin keeps a worm bin in his basement because they need cooler temperatures to survive. He feeds them about 1 pound of kitchen scraps each week. One summer the temperatures rose above the optimal temperature for the red worms (~ 85°F) and many in his colony died. However, those that survive continued to reproduce and within 6 months his colony was again thriving. The next summer, unusually warm temperatures again cause the basement temperatures to rise above 85°F for 2 days in a row. Surprisingly, Martin noticed that only a small portion of the worm colony died. What is the best explanation for this?
What will be an ideal response?
A scientist studying helminths is working with bacteria.
Answer the following statement true (T) or false (F)