How is DNA replication of a circular bacterial chromosome terminated?
What will be an ideal response?
Ans: Termination occurs when the two replication forks meet each halfway around the circle. ter sites that flank the halfway point "trap" a faster-moving fork until the slower-moving fork catches up.
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The traditional class Reptilia is ____ because it does not include all descendants of the most recent common ancestor
of reptiles. a. monophyletic b. paraphyletic c. polyphyletic d. sister taxa e. cladistic
A DNA fingerprint of a suspect doesn't match a DNA fingerprint from a blood sample taken at a crime scene. What can you conclude?
A) The suspect was never at the crime scene. B) The blood sample was probably degraded or destroyed in some way. C) There is no DNA in a blood sample. D) The blood came from a different person, but the suspect may have been there.
Which of the following statements concerning Pasteurella is FALSE?
A. It is oxidase positive. B. It is non-motile. C. Humans are typically infected via animal bites. D. It is fastidious in its growth and must be cultivated on blood or chocolate agar. E. It is very resistant to a wide variety of antibacterial drugs including fluoroquinolones.
Which tissue type in the human body is exposed directly to the bloodstream?
A) muscle B) connective C) epithelial D) nervous