Multiple choice

Which of the following statements is not true for the cell-surface protein kinases- linked receptors?

  1. Ligand binding stimulates the receptors.

  2. Kinases are part of the receptors or associated with the plasma membrane.

  3. All protein kinases linked receptors have intrinsic enzymatic activity.

  4. Animal cells contain two types of kinases.

  5. The activity of the kinases is opposed by the activity of phosphatases.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This statement for the protein kinases-linked receptors is incorrect because the tyrosine kinases-linked receptors lack intrinsic catalytic activity. However, the binding of the ligand prompts the formation of a dimeric receptor, which then interacts with the cytosolic enzymes.

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