Experiments called in vitro evolution or directed evolution have shown that:a
RNA can evolve into DNA.
b. RNA can evolve to catalyze a variety of reactions.
c. RNA can evolve into protein enzymes.
d. DNA can evolve the double helix structure.
e. RNA can evolve to self replicate.
B
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Stabilizing selection reduces genetic and phenotypic variation and increases the frequency of intermediate phenotypes
a. True b. False
An understanding of the biology of marine animals is needed in order to implement adequate management of marine fisheries
Indicate whether the statement is true or false
If someone who is severely allergic to bee stings gets stung, the person may experience anaphylactic shock, which can cause a fatal drop in blood pressure
The drop in blood pressure is due to an inappropriate release of histamine in response to the sting. Histamine causes massive vasodilation, so how does this affect blood pressure?
The loss of water from a plant by transpiration cools the leaf. Movement of water in transpiration requires both adhesion to the conducting walls and wood fibers of the plant and cohesion of the molecules to each other
A scientist wanted to increase the rate of transpiration of a crop species to extend its range into warmer climates. The scientist substituted a nonpolar solution with an atomic mass similar to that of water for hydrating the plants. What do you expect the scientist's data will indicate from this experiment? A) The rate of transpiration will be the same for both water and the nonpolar substance. B) The rate of transpiration will be slightly lower with the nonpolar substance as the plant will not have evolved with the nonpolar compound. C) Transpiration rates will fall to zero as nonpolar compounds do not have the properties necessary for adhesion and cohesion. D) Transpiration rates will increase as nonpolar compounds undergo adhesion and cohesion with wood fibers more readily than water.