All cells have at least one strand of DNA. prokaryotic cells are single celled, plants have a cell wall and vacuoles, animal cells have a centrosome. smooth or: synthesize lipids, metabolized carbohydrates, store calciumrough or: has bound ribosomes, produces proteinsGolgi apparatus: flattened membrane sacs, modifies products of the ER manufacturers macromolecule sorts. lysosomes: membrane sac of hydrolytic enzymes, hydrolyzes proteins, mitochondria: power house of the cell, makes ATP and such chloroplasts: allows photosynthesis to be a thing
Answer: Option C.
Cellulose.
Explanation:
Cellulose is a polysaccharide which is made up of glucose and it is an important component in plant cell wall. It give strength and rigidity to the cell wall. Cellulose make the cell walls strong. This play a regulatory role in tissues growth and provide strength. The cellulose is only found in cell wall and it's protect the cell wall.
Answer:
Lower esophageal sphincter
Explanation:
The biological valves are the muscular structures composed of the smooth muscles which form thick tubular structure to allow the controlled movement of any material through it. The valves in the digestive system are known as the sphincters.
The sphincters control the unidirectional movement of the eaten food, chyme and the bolus in the digestive tract.
A sphincter is present at the lower portion of the oesophagus (food pipe) which contracts to prevent the backflow of the food from the stomach and since the sphincter is present at the lower side of the oesophagus, therefore, is known as the lower esophagal sphincter.
Thus, Lower esophageal sphincter is correct.
