A.What is a kinase? a. A molecule that transports glucose molecules across a mem

Question

A.What is a kinase? a. A molecule that transports glucose molecules across a membrane b. A molecule that specifically catalyzes the breakdown of carbohydrates c. A type of enzyme that catalyzes the addition of a phosphate group onto another molecule d. An enzyme that catalyzes the building of complex carbohydrates from simple sugars e. A type of second messenger involved in signal transduction pathways B. What type of receptor is the insulin receptor? a. An enzyme-linked receptor A chemically-gated ion channel c. A ligand-gated ion channel d. A G-protein-coupled receptor e. A nuclear receptor C. What is the ligand for the insulin receptor? a. Glucose b. cAMP c. Iyrosne d. ATP e. Insulin D. What causes the activation of a membrane receptor? a. Binding of a substrate to the cytoplasmic side of a receptor activates it b. Binding of a ligand to the receptor cause a conformational shape change that activates the receptor. c. Phosphorylation of the extracellular side of the receptor by ATP activates it d. When a ligand and receptor dissociate, it causes a conformational shape change that activates the receptor e. Membrane receptors are always activated.

Explanation / Answer

A- c

B-a

C-e

D- b

Note - the insulin bind to the receptor as ligand and act on enzyme linked receptor like protein kinase .

Membrane receptor need binding of ligand on surface which bring about change in receptor configuration.

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