The ?-helix and ?-pleated sheet are examples of which level of protein structure?
A. primary
B. secondary
C. tertiary
D. quaternary
Answer: B
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Transposons
A. are informally known as jumping genes. B. may cause insertion mutations. C. may cause knockout mutations. D. were first recognized in plants. E. All of the choices are correct.
The stage of mitosis when sister chromatids separate from each other and migrate to opposite poles of a cell is called
A) interphase. B) prophase. C) metaphase. D) anaphase. E) telophase.
The standard classification system used by biologists today groups and classifies organisms on the basis of similar physical traits. This system was first developed by Carl Linnaeus
At the time of his work, there were other methods for grouping organisms that were based on similar habitats, similar diets, or similar behaviors. Why is the Linnaen system still useful to biologists today? A) This system is the simplest; the others are too complicated. B) This system classifies based on shared traits and infers evolutionary relationships. C) This system included all organisms found on Earth. D) This system relies on Latin names that make the most sense to biologists.
If you were designing a method to specifically inhibit prokaryotic transcription, but not eukaryotic transcription, interfering with which of the following would work best?
A) an intercalating agent B) recognition of the prokaryotic promoter by RNA polymerase C) DNase activity D) RNA polymerase II activity E) ribosomal binding to mRNA