Proteins on the surface of vesicles determine where the vesicles go. which cell organelle provides the instructions for these proteins? a. endoplasmic reticulum b. lysosome c. mitochondria d. nucleus

The correct answer is option A, that is, Endoplasmic reticulum.  

The function of the nucleus is to function as the brain of the cell, while the endoplasmic reticulum function as a packaging and manufacturing system. It functions in close tandem with the ribosomes, Golgi complex, tRNA, and mRNA.  

The endoplasmic reticulum performs various functions, involving the folding of the molecules of proteins in the sacs known as cisternae and the conduction of the synthesized proteins in the vesicles to the Golgi apparatus.  

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation: