The Central Dogma specifies that the information in ________
A) DNA is copied into an RNA molecule during transcription, and the information in that RNA molecule is used to make a protein during translation
B) DNA is copied into an RNA molecule during translation, and the information in that RNA molecule is used to make a protein during transcription
C) RNA is copied into a DNA molecule during transcription, and the information in that DNA molecule is used to make a protein during translation
D) protein is copied into an RNA molecule during translation, and the information in that RNA molecule is used to make DNA during transcription
E) DNA is copied directly into a protein
Answer: A
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You and a friend are student assistants in a research laboratory that investigates the anti-cancer properties of proteins isolated from marine organisms. Your friend mentions that she is using a BAC vector to insert shark DNA into Escherichia coli, but after repeated attempts, has found that the bacterial cells fail to synthesize the encoded protein. What is your advice?
A. Since shark DNA is eukaryotic, the cloning vector should be a YAC derived from yeast rather than a BAC derived from bacteria. B. If the shark DNA is unmodified, it contains introns that are not recognized by bacteria, therefore protein synthesis will not occur. C. It is impossible to clone eukaryotic DNA into a bacterial host, since eukaryotic DNA has introns and prokaryotic DNA does not. D. Because Escherichia coli is not naturally competent, it cannot serve as the cloning host for foreign DNA.
When added to water, a base will act as a(n) ____ and cause the pH of the solution to ____
a. proton acceptor; rise b. proton donor; rise c. proton acceptor; fall d. proton donor; fall e. acid; fall
If we continued to follow the cell lineage from question 4, then the DNA content at metaphase of meiosis II would be
A) 0.25x. B) 0.5x. C) x. D) 2x. E) 4x.
Which phrase would most likely be used in a discussion of homeostasis?
A. Respond to environmental stimuli B. Limited range of variation C. Rapid energy turnover D. Both respond to environmental stimuli and limited range of variation E. Both respond to environmental stimuli and rapid energy turnover