The units of inheritance are
a. heredities.
b. evolutions.
c. twins.
d. metabolic activities.
e. genes.
E
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Which of the following is true of hydrogen peroxide?
A. It is a sterilant for inanimate objects and is quickly inactivated on living tissue. B. It leaves a toxic residue. C. It is broken down by catalase into water and oxygen. D. It is even more effective when used in combination with peracetic acid. E. It is a sterilant for inanimate objects and is quickly inactivated on living tissue; it is broken down by catalase into water and oxygen; AND it is even more effective when used in combination with peracetic acid.
Animals establish and defend territories only when ____
a. the effort does not endanger the life of the individual b. males compete for females by fighting c. females choose among displaying males d. some critical resource is in short supply e. territorial defense is not energetically costly
Which of the following will protect the body against any type of pathogen and infection?
A) acquired defenses B) cell-mediated immunity C) innate defenses D) antibody-mediated immunity
As glaciers in North America melted, formerly glaciated areas were invaded by
A) ice. B) tundralike vegetation. C) boreal forest, dominated by spruce and jack pine. D) various species of trees, including spruce, white pine, oaks, and maples.