Arnold was involved in a major traffic accident, and some of the nerves in his spinal cord were cut. What are his chances for a full recovery? Please explain your answer
What will be an ideal response?
The outlook is most likely poor because most neurons cannot divide, although there is some chance that future research with stem cells and nerve growth factors may help. Computers can stimulate the correct muscles to produce movements; with this type of assistance, people can now walk, whereas previously their mobility would have been limited or nonexistent.
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The cyanobacterium Trichodesmium ________.
A. fixes a significant amount of N2 in oceanic environments B. uses nitrite as a source of nitrogen C. is a spherical organism D. fixes N2 during the day
Which of the following is not a fat-soluble vitamin?
a. vitamin A b. B-complex vitamins c. vitamin D d. vitamin K e. vitamin E
The toxin production by Corynebacterium diphtheriae carrying a temperate phage is an example of __________.
a. phage conversion b. general transduction c. specialized transduction d. phage lysis
Suppose male drones were only half as costly to produce as female honeybees. What sex ratio would be opti-mal from the perspective of worker bees?
a. a 3:1 female:male sex ratio c. a 1:2 female: male sex ratio b. a 3:2 female:male sex ratio d. a 1:6 female:male sex ratio