1 Which of these binds a ligand and undergoes a conformation

1.) Which of these binds a ligand and undergoes a conformational change to allow ion flux across the membrane?

a.) Channel

b.) Transporter

c.) Enzyme

d.) G-protein coupled receptor

2.) Which of these operates with molecules that can diffuse through the cell membrane (e.g. steroid hormones)?

a.) Ligand gated channels

b.) Enzyme/enzyme linked receptors

c.) G protein-coupled receptors

d.) intracellular receptors

Solution

1.The correct answer is : d) G protein-coupled receptor.

Reason:When a ligand binds to the G protein-coupled receptor, it causes a conformational change in the GPCR, and it functions as a guanine nucleotide exchange factor (GEF).

2.The correct answer is :d) intracellular receptors.

Reason:The receptors for steroid hormones are present inside the target cells,either in the cytoplasm or in the nucleus and are known intracellular receptors.