Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each personâs unique physical features. Genes are made up of DNA.Each chromosome contains many genes. A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.lleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each personâs unique physical features. Genes are made up of DNA.
To make a muscle contract, the acetylcholine produced in the presynaptic neuron of the neuromuscular junction must bind to the nicotinic receptors on the postsynaptic side. Each of these receptors consists of 5 subunits that form a pentagonal structure around a central channel.
Acetylcholine is found at the synapses between neurons and muscle cells. It serves to activate the muscle to contract. If acetylcholine receptors sites on the muscle cell are blocked in someway, then the acetylcholine cannot get on the site and the muscles will be incapable of contracting-paralyzed that is.here are two main classes of acetylcholine receptors(acetylcholine receptor is an integral membrane protein that responds to the binding of acetylcholine neurotransmitter), nicotinic acetylcholine receptors and muscarinic acetylcholine receptors.