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TLS Online TPP Program

#Question id: 3818

DNA replication is studied in a newly discovered bacterium. It takes 30 min for the bacterium to complete a round of replication at 37oC. A Meselson-Stahl-type experiment was performed. The bacteria were grown for several generations in 14N-medium and then switched to 15N-medium. The DNA molecules were then analyzed.

If the mechanism of DNA replication in this bacterium were semi-conservative, what results would be found when the double-stranded DNA was analyzed in a CsCl density gradient after three generations in 15N-medium?

#Unit 3. Fundamental Processes

  1. The DNA would form three bands: one with hybrid density, one with light density, and one with heavy density.

  2. The DNA would form one band with hybrid density.

  3. The DNA would form two bands: one with heavy density and one with hybrid density.

  4. The DNA would form two bands: one with light density and one with hybrid density.

More Questions
TLS Online TPP Program

#Question id: 28222

#Unit 5. Developmental Biology

Hematopoietic stem cells has the ability to divide into lymphoid progenitor cell as well as myeloid progentior cell only, this is an example of
TLS Online TPP Program

#Question id: 11935

#Unit 7. System Physiology – Animal

Which of the following systems conveys information concerning highly localized touch sensation and body position (proprioceptive) sensation?
TLS Online TPP Program

#Question id: 31412

#Unit 7. System Physiology – Animal

Which of the following would not be expected to increase renin secretion?
TLS Online TPP Program

#Question id: 11201

#Unit 7. System Physiology – Animal

Why are action potentials usually conducted in one direction?
TLS Online TPP Program

#Question id: 991

#Unit 1. Molecules and their Interaction Relevant to Biology

The conversion of UTP to CTP involves ________.