Plasmid DNA having one EcoRI recognition sequence is treated with EcoRI restriction endonuclease. Following gel electrophoresis, how many bands should be visible on the gel?
A. Zero
B. Four
C. One
D. Two
Answer: C
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Where would you expect to find an organism possessing a cell membrane composed of large proportions of cholesterol and a predominance of unsaturated fatty acids?
A) frozen wastelands B) temperate regions C) tropical regions D) equatorial regions E) upper levels of an aquatic environment
In the process of molecular cloning, which of the following cuts DNA double strands so that they have sticky ends?
a. restriction enzyme b. recombinant protein c. plasmid d. codon
The rate of background extinction is
A. 0.1 to 1.0 species per year per million species. B. 0.001 to 0.01 species per year per million species. C. 1.0 to 10 species per year per million species. D. 10 to 100 species per year per million species. E. None of the answers are correct.
If two individuals who are heterozygous for the sickle-cell disease mate, their offspring:
a) will all have the sickle-cell disease. b) will have a 25% chance of having sickle-cell disease. c) will have a one-quarter chance of being a sickle-cell free homozygote. d) will consist of males who all have sickle-cell disease and females who all are heterozygous for sickle-cell disease. e) both b) and c) are correct.