Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 35777
TLS Online TPP Program

#Question id: 23849

Which pathway regulates the contraction of vertebrate smooth muscle? 

#Unit 2. Cellular Organization
  1. When the Ca2+ level rises → Ca2+ binds CaM→ MLC kinase becomes inactive → dephosphorylates the myosin LC → unfolds the myosin II→ assemble into bipolar filaments for contraction. 
  2. When the Ca2+ level rises→Ca2+ binds CaM→activates MLC kinase→ phosphorylates the myosin LC→unfolds the myosin II → assemble into bipolar filaments for contraction. 
  3. When the Ca2+  returns to its resting level → Ca2+ binds CaM → activates MLC kinase→ phosphorylates the myosin LC → unfolds the myosin II→ causing muscle contraction.
  4. When the Ca2+ level rises→ Ca2+ binds CaM→ activates MLC kinase → phosphorylates the myosin LC → myosin adopts a folded conformation→ assemble into bipolar filaments for contraction. 
More Questions
TLS Online TPP Program

#Question id: 28938

#Unit 7. System Physiology – Animal

Central diabetes insipidus is caused by___
TLS Online TPP Program

#Question id: 5352

#Unit 8. Inheritance Biology

Marriage occurs between individuals III-3 and III-6, what is the probability couple; son would be affected with the trait?
TLS Online TPP Program

#Question id: 5645

#Unit 5. Developmental Biology

A reproductive difference between sea urchins and humans is ________.
TLS Online TPP Program

#Question id: 11189

#Unit 7. System Physiology – Animal

Refer to the following graph of an action potential to answer the question.

At label ________, the cell is not hyperpolarized; however, repolarization is in progress, as the sodium channels are inactivated or becoming inactivated, and many potassium channels have opened.
TLS Online TPP Program

#Question id: 19177

#Unit 13. Methods in Biology

Hot-start PCR is a modification of PCR. Which of the following is not corresponding to it?