What is the difference between ion channels in the postsynaptic neuron cell body and ion channels in the axon of a neuron?
What will be an ideal response?
Ion channels in the neuron cell body are passive transport proteins with a neurotransmitter binding site. Once a neurotransmitter binds its receptor, the passive transport protein changes shape and allows ions (sodium) to flow through the ion channel. It is therefore chemically controlled/gated.
The ion channels in axons are gated ion channels. These ion channels remain closed unless the threshold potential has been reached. The gated ion channels will then open and allow ions (sodium and then later potassium) to flow through the ion channel. Therefore, the axon channels are voltage controlled/gated.
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What do the colors in in the figure below likely represent?
A. nothing, they are just there to make the chromosomes look nice. B. the presence of different genes along the length of DNA. C. the presence of different histone proteins in the chromatin. D. different levels of packaging and condensation of the chromatin.
What is the major reason that deforestation is difficult to reverse?
a. The soil is too acidic. b. Trees must have shade to grow. c. Landslides become too frequent. d. Soil nutrient loss and drier, hotter conditions make it difficult for seedlings. e. Seeds cannot spread.
Nitrogen is made available to legumes because of a symbiotic relationship between the plant and
A. a virus. B. bacteria. C. fungi. D. protozoa.
An effective inflammatory response may result in all of the following EXCEPT
A) limiting tissue damage. B) attracting immune cells towards the site of injury. C) destroying damaged cells at infection sites. D) causing dramatic loss of blood pressure, also known as septic shock. E) destroying pathogen invaders.