When an arborist prunes a limb off a valuable tree, he or she may paint the cut surface. The primary purpose of the paint is to _____
A) minimize water loss by evaporation from the cut surface
B) improve the appearance of the cut surface
C) stimulate growth of the cork cambium to "heal" the wound
D) block entry of pathogens through the wound
D
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Which of the following features of ancient horses are adaptations for living on open grasslands? Check all that apply.
_____ multiple toes that increased flexibility _____ complex patterns of ridges on molar and premolars that increased chewing ability _____ lengthening of limbs that increased running speed over long distances _____ decrease in body size that increased agility in confined spaces
What was the major stumbling block for the acceptance of natural selection as a mechanism for
evolution when proposed by Darwin?
a. strong evidence for inheritance of acquired traits b. lack of a fossil record c. lack of a plausible theory of heredity d. lack of evidence for artificial selection e. lack of observational and experimental data
Aerobic exercises do not increase skeletal muscle size, but they do cause various changes in the body. Explain what changes aerobic exercises initiate
What will be an ideal response?
Which of the following is the binding site for RNA polymerase on the DNA molecule?
A. Structural genes B. Repressor genes C. Promoter sequence D. Operator sequence E. The region between an operator and the first structural gene