Who is credited with demonstrating unidirectional and nonreciprocal transfer of DNA between two mating E. coli cells?

A. Tatum
B. Hayes
C. Lederberg
D. None of the choices are correct.


Answer: B

Biology & Microbiology

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Which of the following enzymes relieves the strain in DNA introduced by unwinding in E. coli?

A. gyrase B. ligase C. primase D. helicase E. SSB

Biology & Microbiology

Most scientists accept that the most probable

reason for the extinction of the dinosaurs was

a. the result of an asteroid impact. b. the loss of food sources. c. from being out-competed by mammals. d. gas emissions from volcanoes. e. giant tsunamis caused by earthquakes

Biology & Microbiology

Compare and contrast the three types of muscle tissue. What will be an ideal response?

Biology & Microbiology

Which of the following statements accurately describes transcription by RNA polymerase?

A. RNA polymerase simultaneously transcribes both strands of DNA B. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5' to 3' direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 5' to 3' direction, producing two different transcripts C. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5' to 3' direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 5' to 3' direction, producing two identical transcripts D. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5' to 3' direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 3' to 5' direction, producing two different transcripts E. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5' to 3' direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 3' to 5' direction, producing two identical transcripts

Biology & Microbiology