The polymerase chain reaction is used to
A. amplify certain sections of DNA.
B. amplify mRNA.
C. produce proteins.
D. produce long polymers of carbohydrates to be used in electrophoresis.
A
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. triggers the release of a second messenger which leads to the hydrolysis of glycogen to glucose b. triggers the release of a second messenger which lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
Four of the five answers listed below are characteristics of a plasma membrane. Select the exception
a. phospholipid b. fluid mosaic c. lipid bilayer d. hydrophilic tails e. membrane proteins
Salinization of water used in irrigation has reduced crop yields by ____
a. 10 percent b. 25 percent c. 33 percent d. 50 percent e. 75 percent
What does it mean for an apicomplexan to have a complex life cycle?
a. require two or more hosts b. have many specialized structures c. never age d. begin with a larval stage