Practice Questions

TLS Online TPP Program

#Question id: 3990

Which of the following statements is true of the attenuation mechanism used to regulate the tryptophan biosynthetic operon in E. coli?

#Unit 3. Fundamental Processes

Attenuation is the only mechanism used to regulate the trp operon.
One of the enzymes in the Trp biosynthetic pathway binds to the mRNA and blocks translation when tryptophan levels are high.
The leader peptide plays a direct role in causing RNA polymerase to attenuate transcription.
Trp codons in the leader peptide gene allow the system to respond to tryptophan levels in the cell.

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TLS Online TPP Program

#Question id: 23221

#Unit 13. Methods in Biology

Unsectioned specimens can be used in which type of microscope?

TLS Online TPP Program

#Question id: 23279

#Unit 13. Methods in Biology

What will be the value of D if sin angle is 90o and oil immersion is used at λ=700?

TLS Online TPP Program

#Question id: 31345

#Unit 13. Methods in Biology

confocal laser scanning microscope (CLSM) is basically used to detect except

TLS Online TPP Program

#Question id: 31359

#Unit 13. Methods in Biology

Which of the following microscopy uses photoswitchable fluorophores that can be switched between a "on" (fluorescent) and "off" (dark) state, allowing only a small subset of molecules to be illuminated at a time, enabling precise localization of each individual molecule.

TLS Online TPP Program

#Question id: 19684

#Unit 13. Methods in Biology

Which of the following is used to measure the electrical activity of the heart?

TLS Online TPP Program

#Question id: 19685

#Unit 13. Methods in Biology

The P-waves of ECG indicates: