Since 2008, grizzly bears (Ursus arctos horribilis) have been spotted farther north than their historic range. As a result, grizzly bear habitat now overlaps polar bear (Ursus maritimus) habitat. The two species of bears, which are capable of mating and producing viable offspring, are considered separate “ecological” species because historically they lived in different habitats and never met. However, in 2006 a hunter shot a wild grizzly-polar bear hybrid known as a grolar bear, the first wild hybrid ever found. This overlap is due to which of the following threats to biodiversity?
a. overharvesting
b. habitat loss
c. global climate change
d. introduction of exotic species
c. global climate change
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Hydrophobic interactions:
A. arise from the tendency of nonpolar molecules to exclude water in solution. B. destabilize proteins. C. destabilize the base-stacking interactions of DNA helices. D. occur between molecules having partial charges. E. are a function of the repulsive forces generated when atoms are closer than their van der Waals radii.
In addition to investigations with bacteria that led to him being considered the Father of Microbiology, Pasteur also
A. found that some molecules can exist as stereoisomers. B. created aspartame. C. separated organic acids using a microscope. D. discovered polarized light. E. found that some molecules can exist as stereoisomers AND separated organic acids using a microscope.
Represented by only two living genera, Psilotum and Tmesipteris, these plants resemble the extinct
Cooksonia. Having no true roots or leaves, these seedless vascular plants are essentially forking green stems.
a. mosses b. whisk ferns c. ferns d. club mosses e. horsetails
Give the three major principles of the cell theory.
What will be an ideal response?