Humans possess several characteristics that, when taken together, differentiate them from other organisms. These characteristics include all of the following EXCEPT which one?
A) opposable thumbs
B) capacity for complex language
C) bipedalism
D) large brain relative to body mass
E) the inability to maintain a constant internal body temperature
E
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What do you think would result if nitrogen-fixing cyanobacteria populations suddenly declined?
A. Aquatic primary production would decline, particularly in regions not subject to fertilizer runoff. B. Legumes would cease to grow, but other types of plants would be unaffected. C. Both the aquatic and terrestrial populations of autotrophs would collapse. D. Populations of denitrifying bacteria would expand to take over their role, creating only a temporary disruption. E. More nitrogen would become available for other aquatic autotrophs.
Aerobic exercise affects muscle cells by
1.increasing the number of mitochondria. 2.increasing the size of mitochondria. 3.increasing the number of capillaries supplying muscle tissue. 4.increasing nourishment to the cells and waste removal from the cells. 5.all of the choices
Today, the major danger to species is:
a. hunting by humans. b. introduction of exotic species. c. destruction of habitats. d. predator control. e. commercial harvesting.
The reason segmental duplications pose a logistical challenge in the proper alignment of DNA sequences is that they
A. contain large numbers of LINEs, which interfere with sequence annotation. B. are inherently repetitive. C. interfere with BLAST analysis. D. are often found in areas of constitutive heterochromatin.