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TLS Online TPP Program

#Question id: 3886

Which one of the following statements about the reverse transcriptases of retroviruses and the RNA replicases of other single-stranded RNA viruses, such as R17 and influenza virus, is correct?

#Unit 3. Fundamental Processes

  1. Both enzymes can synthesize either RNA or DNA from an RNA template strand.

  2. Both enzymes can utilize DNA in addition to RNA as a template strand.

  3. Both enzymes carry the specificity for the RNA of their own virus.

  4. Both enzymes have error rates similar to those of cellular RNA polymerases.

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TLS Online TPP Program

#Question id: 1765

#Unit 4. Cell Communication and Cell Signaling

Low amounts of antigen:
TLS Online TPP Program

#Question id: 8774

#Unit 9. Diversity of Life Forms

A large proportion of archaeans are extremophiles, so called because they inhabit extreme environments with high acidity, salinity, and/or temperature. Such environments are thought to have been much more common on primitive Earth. Thus, modern extremophiles survive only in places that their ancestors became adapted to long ago. Which of the following is, consequently, a valid statement about modern extremophiles, assuming that their habitats have remained relatively unchanged?
TLS Online TPP Program

#Question id: 28164

#Unit 13. Methods in Biology

It is possible to calculate the number of clones that must be present in a gene library to give a probability of obtaining a particular DNA sequence. This correct formula is:
TLS Online TPP Program

#Question id: 13207

#Unit 6. System Physiology – Plant

The polymer-trapping model explains symplastic loading in plants with intermediary-type companion cells, this model makes three prediction; which one of the following prediction is INCORRECT?
TLS Online TPP Program

#Question id: 23701

#Unit 13. Methods in Biology

To introduce a particular piece of DNA into an animal cell, such as that of a mouse, you would find more probable success with which of the following methods?