Organisms use carbohydrates in all of the following ways EXCEPT
A) as a component of cell walls.
B) as a long-term energy source.
C) as a short-term energy source.
D) to keep membranes flexible at low temperatures.
E) as a building block of DNA and RNA molecules.
D
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A continual source of genetic variation in populations is ________, which changes one allele into another.
A) mutation B) migration C) random mating D) natural selection
Which of the following part of your immune system is activated in response to a particular antigen or pathogen?
a. adaptive immunity b. innate immunity c. complement proteins d. mucus membranes
Mitotic Cdk-cyclin is active when it is
A) singly phosphorylated. B) acetylated. C) doubly phosphorylated. D) doubly methylated. E) cleaved by proteases.
A biologist discovers two populations of wolf spiders whose members appear identical. Members of one population are found in the leaf litter deep within a woods. Members of the other population are found in the grass at the edge of the woods. The biologist decides to designate the members of the two populations as two separate species. Which species concept is this biologist most closely utilizing?
A) ecological B) biological C) morphological D) paleontological E) phylogenetic