A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 0
B. 5
C. 7
D. 9
E. 14
B
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Phagocytes were first discovered and named by
A. Pasteur. B. Koch. C. Lister. D. Metchnikoff.
The arrows in the diagram below are pointing
to
a. the esophagus and small intestine. b. the trachea and large intestine. c. the sphincters at the top and bottom of the stomach. d. the esophagus and pancreas. e. the stomach
You have isolated a piece of DNA that you believe contains an interesting gene. Using a mix of RNA polymerase and ribonucleotides, you perform in vitro transcription
However, even though all of your controls work, no mRNA is created from your DNA fragment. Working backward, you note that your DNA preparation removed approximately 250 base pairs from the 5' end of the gene. The most likely explanation is that during DNA preparation A) the termination signal was removed. B) the RNA polymerase became inactivated. C) the 5' methyl guanosine cap was removed. D) the promoter was removed. E) None of these explains the negative results.
A mature mRNA contains which of the following?
A. Exons B. 5' Cap C. 3' Poly-A-tail D. introns E. All of the above F. A, B, C, D G. A, B, C, H. B, C, D