This is an example of which type of selection?
You are all excited because you just purchased a male guppy that has red, blue and green colors on its fins and tail. Your guppies at home do not have this combination of colors. You place the new male in with three females for mating purposes. After three weeks you have many new baby guppies and most of them have the new color combination.
A. Natural.
B. Environmental.
C. Analogous.
D. Convergent.
E. Artificial.
E. Artificial.
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After some time, the tip of a plant that has been forced into a horizontal position grows upward. This phenomenon is related to _____
A) calcium release from the endoplasmic reticulum of shaded cells B) whether the plant is in the northern or southern hemisphere C) gibberellin production by stems D) auxin production in cells receiving red light E) auxin movement toward the lower side of the stem
Desulfuromonaceae and Geobacteraceae are strict anaerobic mesophilic bacteria and have been isolated from anoxic ________ environments.
What will be an ideal response?
"Glycogenolysis" refers to the state where
A. glucose levels are increased in the blood through the breakdown of glycogen. B. glucose levels are increased in the blood through the synthesis of glycogen. C. glucose levels are decreased in the blood through the breakdown of glycogen. D. glucose levels are decreased in the blood through the synthesis of glycogen. E. glucose levels are increased in the blood as a result of lipolysis.
In the above figure, why does the curve sharply drop after approximately 45?C instead of mirroring the
slope of the line going from 0?40?C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes. c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.