Changes in the phenotypes within a population ultimately result from changes in what?
a. changes in the rate of mutation
b. changes in the rate of gene flow
c. changes in the rate of genetic drift
d. changes in the gene pool
d. changes in the gene pool
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The major reason why there are fewer antiprotozoan drugs than antibacterial drugs is because
A. antiprotozoan drugs cost much more than antibacterial drugs to develop. B. antiprotozoan drugs are only effective when injected. C. it is much more difficult to develop selectively toxic antiprotozoan drugs since protozoan cells are eukaryotic. D. antiprotozoan drugs are not needed in the United States.
Viroids are naked (lacking a protein shell) pieces of DNA that infect plants
Indicate whether this statement is true or false.
In a cell membrane, the phospholipid heads are ____
a. hydrophobic b. nonpolar c. dissolved in the cell’s watery interior d. sandwiched between the phospholipid tails e. formed by fatty acids
Which of the following is associated with sexual reproduction?
A) fission, only B) fragmentation, only C) budding, only D) None of these are associated with sexual reproduction.