Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 2603
TLS Online TPP Program

#Question id: 2628

Choose true statement about lac repressor;

#Unit 2. Cellular Organization

  1. Lac repressor binds as a dimer.

  2. located 400 bp downstream and 90 bp upstream of the primary operator.

  3. Each operator is contacted by only one of these subunits.

  4. The different oligomeric form alters the mechanism of DNA recognition.

More Questions
TLS Online TPP Program

#Question id: 31014

#Unit 4. Cell Communication and Cell Signaling

If the insulin concentration rises fivefold to 2.5 × 10−11 M, as it does after a meal, and the Kd for binding of insulin to its receptor on liver cells, 1.4 × 10−10 M (0.14 nM). What fraction of insulin receptors with bound insulin? 
TLS Online TPP Program

#Question id: 1833

#Unit 4. Cell Communication and Cell Signaling

Specific immunity to Mycobacterium tuberculosis in mice can be transferred to naive histocompatible recipients by:
TLS Online TPP Program

#Question id: 28525

#Unit 5. Developmental Biology

At which stage of plant development, Cell elongation and cellular differentiation processes occur throughout the embryonic axis?
TLS Online TPP Program

#Question id: 18714

#Unit 13. Methods in Biology

At what temperature do denaturation of DNA double helix takes place?
TLS Online TPP Program

#Question id: 1084

#Unit 4. Cell Communication and Cell Signaling

Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?