For some virulent phages, fragments of the host DNA may be included in the heads as the viral particles assemble, providing the basis for transduction of bacterial genes during the next cycle of infection. This mechanism is termed:
a. transformation.
b. transmutation.
c. metabolism.
d. specific transduction.
e. generalized transduction.
E
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Based on the function of mitochondria, what substance is able to pass through the outer membrane of the mitochondria easily?
A. Oxygen B. Sugars C. Amino acids D. Potassium ions
Which statement is NOT true about the RNA-first hypothesis?
A. It says that first RNA, then DNA, and then proteins would have been necessary to interact in the chemical evolution that would have led to the development of the first cells. B. It is supported by the discovery that RNA can act as an enzyme. C. It is supported by the fact that some viruses have RNA as their genetic material. D. It suggests that there was an "RNA world" about 4 billion years ago.
Your research project involves the characterization of a recently identified transcription factor. As part of your project, you want to determine if this transcription factor binds directly to any of the general transcription factors. Unfortunately, you are having trouble expressing the full-length protein. What approach may help achieve your research goal?
A. You must find a way to express the full-length protein, since transcription factor functions do not lie in separate domains. B. Express and purify only the DNA-binding domain, and test for binding. C. Express and purify only the activation domain, and test for binding. D. Identify the RNA that mediates the protein-protein binding.
Diamond shaped scales on lower order fish like bowfins and sturgeons
A) ganoid B) cycloid C) ctenoid D) placoid