Affinity chromatography is a method that can be used to purify cell-surface receptors, while they retain their hormone-binding ability. A ligand (hormone) for a receptor of interest is chemically linked to polystyrene beads. A solubilized preparation of membrane proteins is passed over a column containing these beads. Only the receptor binds to the beads. This method of affinity chromatography would be expected to collect which of the following? A. Molecules of the hormone. B. Molecules of purified receptor. C. G protein. D. Assorted membrane proteins. E. Hormone-receptor complexes.

Affinity chromatography is a method used to separate molecules with high affinity. This technique enables the purification of specific molecules ranging form nucleic acids, enzymes, antigens, antibodies, etc. In the example, the ligand will produce the receptor to be displaced from the beads and then eluted out.

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.