Which Statement Best Reflects the Evolutionary History of the Ligand-Gated

question 17

Multiple Choice

Which statement best reflects the evolutionary history of the ligand-gated channel?

• A) The sequence homology of the ligand-gated receptors is similar to that of voltage-gated receptors.
• B) Ligand-gated channels have had a minimum of three independent appearances in evolutionary history.
• C) Ligand-gated channels in the neuromuscular junction are evolutionarily distinct from ligand-gated channels in the brain.
• D) Most kinds of ligand-gated channels appear to have evolved from a common ancestor.

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Definitions:

Haploid

A cell or nucleus having a single set of unpaired chromosomes, typical of gametes.

Diploid

A diploid cell is one that contains two complete sets of chromosomes, one from each parent, which is the characteristic number of chromosomes for most organisms' body cells.

Gamete Formation

The process by which gametes, or sex cells, are produced, involving meiosis, resulting in cells with half the original number of chromosomes.

Mitosis

A process of cell division in eukaryotic cells that results in two genetically identical daughter cells from a single parent cell.