The effect of increasing the flow of Na+ ions into a neuron at rest (-70 mV initially) would be termed
A. hyperpolarization.
B. depolarization.
C. repolarization.
D. active transport.
E. None of the choices are correct.
B. depolarization.
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Basic dyes
A. have negative charges. B. have positive charges. C. are electrically neutral. D. contain both positively and negatively charged particles.
The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
If a human is deprived of oxygen due to trauma or injury, why is the brain the first area of concern? Check all that apply.
_____ Because the heart can use glycerol and fatty acids as energy sources during the postabsorptive period. _____ Because the skeletal muscles can use glycerol and fatty acids as energy sources during the postabsorptive period. _____ Because we cannot function without the brain. _____ Because the byproducts of the use of glycerol and fatty acids as energy sources during the postabsorptive period by the brain are toxic.
The backbone of organic molecules consists of
covalently bonded __________ atoms. a. oxygen b. hydrogen c. functional-group d. carbon e. all of these