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TLS Online TPP Program

#Question id: 4544

How is the binding of ligand to the extracellular domain communicated to the intracellular domain?

#Unit 3. Fundamental Processes

  1. This can be through an allosteric change in the receptor, whereby binding of ligand alters the shape (and thus activity) of the intracellular domain.

  2. The ligand can act simply to bring together two or more receptor chains, allowing interactions between the intracellular domains of those receptors to activate each other.

  3. Only A

  4. A and B both

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TLS Online TPP Program

#Question id: 32380

#Unit 2. Cellular Organization

Which of the following protein consists almost entirely of a repeating 35-amino-acid actin-binding motif?
TLS Online TPP Program

#Question id: 32381

#Unit 2. Cellular Organization

What is the primary function of ATP hydrolysis in the myosin head?
TLS Online TPP Program

#Question id: 32382

#Unit 2. Cellular Organization

In which case the myosin head is firmly attached to the actin filament?
a. Presence of ATP
b. Absence of ATP
c. Presence of Ca2+
d. Absence of Ca2+
TLS Online TPP Program

#Question id: 32383

#Unit 2. Cellular Organization

Which of the following state is very short-lived, in an actively contracting muscle?
TLS Online TPP Program

#Question id: 32384

#Unit 2. Cellular Organization

Weak binding of the myosin head to a new site on the actin filament causes release of the inorganic phosphate produced by ATP hydrolysis, concomitantly with the tight binding of the head to actin. This state known as:
TLS Online TPP Program

#Question id: 32385

#Unit 2. Cellular Organization

What is the correct sequence of the cycle of structural changes used by myosin II to walk along an actin filament?