Which number identifies the site where activators bind?
a. 2
b. 3
c. 4
d. 5
e. 6
D
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Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of _____
A) purines is always larger than the number of pyrimidines B) pyrimidines is always larger than purines C) cytosines is always the same as adenines D) guanines is always the same as thymines E) purines is always the same as pyrimidines
Which statement is true?
a. Symptoms of Alzheimer’s disease are distinct from symptoms of normal aging. b. Many neurological disorders are treatable but have no known cure. c. Most neurological disorders can be reversed by changes in diet. d. Parkinson’s disease results in extreme shrinkage of the cerebral cortex.
The size of a cell is limited by the ____
a. lack of building materials b. size of the organism c. relationship between the volume of the cell and its surface area d. job it does e. materials it has to exchange
In tropical and temperate regions, ____ becomes more significant than temperature
a. altitude b. precipitation c. latitude d. migration e. pH