What is the function of the myelin sheath in the nervous system?
What will be an ideal response?
The myelin sheath serves to insulate axons of neurons in the brain and spinal cord along with axons outside the brain and spinal cord. It is composed of Schwann cells outside the central nervous system (CNS). The Schwann cells wrap around an axon many times to prevent messages from short-circuiting between neurons.
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Scientists are attempting to genetically modify rice so that it will not incorporate ____ into the grains
a. arsenic b. methylmercury c. chelated iron d. lead e. uranium hexafluoride
In cancer cells there is an increase in
a. fermentation. b. proto-oncogene activity. c. cell division. d. all of these activities. e. two of these activities
A hypothesis is
a. a statement of fact. b. often expressed negatively. c. a form of critical thinking. d. a testable prediction. e. none of these.
When a plant is heterosporous, what does this mean?
a. It has both sporophyte and gametophyte generations. b. It has male and female gametes. c. It has two spore types. d. It has separate male and female plants.