Which of the following biotechnology techniques involves duplicating a small strand of DNA into billions of copies?
a) polymerase chain reaction (PCR)
b) chopping up DNA using restriction enzymes
c) creating a gene library
d) using plasmids to transfer DNA
e) identifying a gene using a DNA probe
Ans: a) polymerase chain reaction (PCR)
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Carrier molecules are utilized for ____
a. active transport only b. passive transport only c. both active and passive transport d. osmosis e. transport of all types of molecules
Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labeled viruses that
insert their double stranded DNA into the DNA of the cells that they infect. The viral DNA is then treated as part of the cell's own DNA and is replicated during DNA replication and passed onto daughter cells when the cell divides. You infect a population of cells with the 32P-labeled viruses, and then let the infected cells go through two generations of cell divisions. If you then examine the cells, you should find 32P-labeled DNA in ____ of the cells.
a. none b. about 1/4 c. about 1/2 d. about 3/4 e. all
Atherosclerosis
a. decreases the size of the lumen of arteries. b. effects the diameter of veins. c. has no effect on the size of the lumen of arteries. d. increases the size of the lumen of arteries. e. presents many clinical symptoms immediately.
"Tardigrada" means
a. tough exoskeleton. b. many proglottids. c. slow walker. d. short digestive system. e. coelom.