In creating a recombinant DNA molecule, what are two methods that prevent re-ligation of the cloning vector that contains no insert DNA?
What will be an ideal response?
1 ) removal of the 5' phosphate 2 ) directional cloning
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Well-developed vascular systems are absent in all of the following except
A. mosses. B. liverworts. C. hornworts. D. Charophytes. E. Pterophytes.
Risk factors for atherosclerosis include factors that can raise the levels of blood cholesterol, such as
A) obesity, smoking, and a sedentary lifestyle. B) regular exercise and a high-fat diet. C) dieting and REM sleep. D) sedentary lifestyle, low-fat diet. E) maintaining homeostatic blood pressure.
What is evolution?
A) a rare event B) a process that is constantly occurring at the same rate in all organisms C) a process that occurs as a result of differences in reproductive fitness D) a process that occurred only in the past
In the anammox reaction ________.
A. nitrogen gas is evolved B. anaerobic oxidation of ammonia is coupled to the reduction of nitrite C. all reactions must take place in the absence of O2 D. All of the choices are correct.