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TLS Online TPP Program

#Question id: 4322

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

#SCPH28 | Zoology

  1. the amino acid inactivates the repressor.

  2. the repressor is active in the absence of the amino acid.

  3. the amino acid acts as a corepressor.

  4. the amino acid turns on transcription of the operon.

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TLS Online TPP Program

#Question id: 2070

#SCPH05 I Biotechnology

The sodium-potassium pump is called an electrogenic pump because it:
TLS Online TPP Program

#Question id: 11330

#SCPH28 | Zoology

Bio geographers have noted that the tropics have more terrestrial species than temperate regions. Which of the following is NOT a plausible explanation for this pattern?
TLS Online TPP Program

#Question id: 11273

#SCPH06 I Botany

Use the following diagram of a hypothetical food web to answer the question. The arrows represent the transfer of energy between the various trophic levels. Which letter represents an organism that could only be a primary consumer and secondary carnivores respectively?
TLS Online TPP Program

#Question id: 12940

#SCPH01 Biochemistry

 Choose the correct order for the steps involve in Protein engineering.
1. Protein modelling
2. Protein crystallography
3. Site-directed mutations
4. Comparison with entries in databases of known proteins.
TLS Online TPP Program

#Question id: 1667

#SCPH01 Biochemistry

A B-cell is able to make cell-surface and secreted versions of antibody using: