Which of the following is NOT true of the
H5N1 virus?
a. It is symptomless in pigs.
b. It has a high mortality rate in humans.
c. It cannot infect birds.
d. It moves poorly from human to human.
e. It can move between pigs
C
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If you applied a toxin that blocked non-voltage-gated potassium channels (i.e., the potassium "leak channels") in a resting neuron, it would cause the membrane potential to be
A. less negative. B. more negative. C. No change would be observed.
The chemical interactions of large organic molecules are largely determined by:
a. their solubility in water. b. their functional groups. c. their polar nature. d. isomerization of these hydrocarbons into other forms. e. the hydrogens bonded to the carbon atom
Which would you find in the heart of a fish?
A. two atria and one ventricle B. one atrium and one ventricle C. two atria and a partially divided ventricle D. one atrium and two ventricles E. two atria and two ventricles
Research has shown that cytokinin levels fluctuate seasonally in temperate plants. What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?
A. Summer, because lower levels of cytokinin would slow growth down and delay leaf aging. This will allow the plant to maximize the production of starch and increase it's sugar reserves. This will help ensure the plant's survival through Autumn and Winter. B. Autumn, because lower levels of cytokinin at this time of year will induce the production of ethylene. This will result in maturation of fruit and ensure effective seed dispersal before Winter. C. Spring, because lower levels of cytokinin allow auxin to promote rapid growth in stem height. This will allow the plant to compete effectively for sunlight. D. Winter, because lower levels of cytokinin will place buds into a dormant state. This will protect the underlying tissues from freezing until Spring.