Restriction endonucleases recognize and clip DNA base sequences called ________.
A. introns
B. palindromes
C. genes
D. exons
E. codons
Answer: B
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In the TCA cycle, two carbons in the form of ________ are added to oxaloacetate at the start of the cycle.
A. methanol B. acetyl-CoA C. ethanol D. carbon dioxide
Which of the following contribute(s) to the differences between the Archaea and the bacteria?
A. Archaea differ from bacteria in their tRNA composition, ribosome structure, and antibiotic sensitivity. B. Archaea have isopranyl glycerol ethers rather than fatty acid esters in their membrane lipids. C. Archaea lack muramic acid. D. All of the choices are correct.
All of the following statements about cell suspension cultures are true EXCEPT
A. cell suspension cultures produce the same chemicals the entire plant produces. B. large numbers of plants are grown and collected from the natural environment to produce chemicals in the laboratory. C. chemicals are produced and extracted in high concentrations, sometimes from genetically modified cells. D. digitalis, digitoxin, and quinine are produced by cell suspension culture.
Four of the following statements about the H5N1 virus are true. Which one is false?
A. It is symptomless in pigs. B. It has a high mortality rate in humans. C. It cannot infect birds. D. It moves poorly from human to human. E. It can move between pigs.