Estimates derived from plot sampling are most accurate when species are not very ____ and conditions across their habitat are uniform
a. well-defined
b. small in size
c. healthy
d. mobile
e. stationary
d
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In the figure above, at which of the numbered regions would you expect to find cells at metaphase?
A) I and IV B) II only C) III only D) IV only E) V only
In order for a cell to respond to the signaling molecule epinephrine, it must have ____
a. ion channels b. a lipid bilayer through which epinephrine can pass
c. receptors with an epinephrine binding site on the cytoplasmic side of the plasma membrane d. receptors with an epinephrine binding site on the plasma membrane surface e. nuclear membrane receptors
The number of proteins in humans
A) is approximately equal to the number of genes. B) is less than half the number of genes. C) is much greater than the number of genes.
First line of defense may be described as
A) the release of prostaglandins and leukotrienes in response to microbes. B) intact skin, mucous membranes, sebum, tears, and so forth. C) damage resulting in cell lysis. D) the coating of a pathogen by complement. E) nonspecific leukocytes that secrete toxins onto the surface of virally infected cells.