Therefore, whenever a ddNTP is added to a growing DNA strand, it is unable to chemically bind with the next nucleotide in the chain, and the DNA strand stops growing. Figure 3: By adding together information about all of the truncated strands, researchers can determine the nucleotide sequence of the DNA target.
Functions of the Bladder. Temporary store of urine â The bladder is a hollow organ. The walls are very distensible, with a folded internal lining (known as rugae), this allows it to hold up to 600ml. Assists in the expulsion of urine â During voiding, the musculature of the bladder contracts, and the sphincters relax.
The epithelium of the lower anal canal contains similarly shaped cell layers. This shape helps to protect the tissues that are below the epithelium. The epithelium also contains many cells that secrete mucus. This mucus lubricates the digestive tract.The lamina propia is a sub-layer that is made of loose connective tissue. The muscularis mucosae is a sub-layer of smooth muscle. The next layer after the mucosa is called the submucosa. This layer is a thick layer of loose connective tissue.his mucus lubricates the digestive tract. The lamina propia is a sub-layer that is made of loose connective tissue. The muscularis mucosae is a sub-layer of smooth muscle. The next layer after the mucosa is called the submucosa. This layer is a thick layer of loose connective tissue.