Natural selection is best described as
A) increasing the perfection of a species.
B) working on the existing variation of traits to favor those better suited to the organism's environment.
C) causing the death of a significant proportion of the population.
D) the ability to generate new traits that better suit the species.
E) driving the species toward an eventual endpoint in which the species possesses the best possible adaptations for that particular environment.
B
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A vascular bundle:
A. contains xylem and phloem B. is not found in leaves C. is usually scattered in the stem of a eudicot D. is on the outer surface of a root E. is very distinct in the apical meristem
The wing of a bat, the flipper of a whale, and the arm of a human have a similar structure and all can trace their lineage back to a common ancestor. This would be an example of which of the following?
a. a homologous structure b. a vestigial structure c. an analogous structure d. none of the above
Which is an example of a disaccharide?
a. ribose b. glucose c. maltose d. fructose e. tricylglycerol
"OUCH!! My muscles are really sore! I've been exercising at such a frantic rate that . . ."
A. my muscle cells have shifted into anaerobic metabolism and I'm making lactic acid that causes them to ache. B. I'm producing lactic acid that, once I slow down, will make its way back to my liver where it will be converted back into glucose. C. I need to get more O2 to my muscle cells. D. All of these choices are true.