Before the process of mitosis can start, which must occur?
A. DNA replication
B. RNA transcription
C. protein translation
D. microtubule formation
Ans: A. DNA replication
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You are working to characterize a novel protein in mice. Analysis shows that high levels of the primary transcript that codes for this protein are found in tissue from the brain, muscle, liver, and pancreas. However, an antibody that recognizes the C-terminal portion of the protein indicates that the protein is present in brain, muscle, and liver, but not in the pancreas. What is the most likely explanation for this result?
A. The gene that codes for this protein is not transcribed in the pancreas. B. The transcript is immediately degraded in the pancreas. C. The transcript receives a 5’ cap in the pancreas. D. Alternative splicing in the pancreas creates a protein missing the domain that the antibody recognizes. E. The transcript receives a 3’ poly-A tail in the pancreas. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about post-transcriptional regulatory mechanisms? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The activation energy for a reaction
a. is less when enzymes are present. b. allows greater interaction of substrate with the active site. c. is needed to begin a reaction. d. puts the substrate at its transition state. e. is all of these.
During gel electrophoresis, large DNA fragments will _____ small DNA fragments.
A. migrate more rapidly than B. separate into C. migrate at the same speed as D. cause degradation of E. migrate more slowly than
Cell deteriorations due to viral infections are known as
a) transformations. b) biosynthesis. c) cytopathic effects. d) plaques.