AP BIOLOGY

Detailed explanation-1: -Ribosomes are frequently found freely in the cytoplasm of prokaryotic cells. Ribosomes in eukaryotic cells either exist freely in the cytoplasm or adhere to the outer surface of the endoplasmic reticulum membrane. Synthesis of proteins takes place in these ribosomes.

Detailed explanation-2: -Ribosomes are the sites in a cell in which protein synthesis takes place. Cells have many ribosomes, and the exact number depends on how active a particular cell is in synthesizing proteins.

Detailed explanation-3: -The P-site (for peptidyl) is the second binding site for tRNA in the ribosome. The other two sites are the A-site (aminoacyl), which is the first binding site in the ribosome, and the E-site (exit), the third. During protein translation, the P-site holds the tRNA which is linked to the growing polypeptide chain.

Detailed explanation-4: -Three tRNA-binding sites are located on the ribosome, termed the A, P and E sites.

Detailed explanation-5: -Ribosomes act as the site for protein synthesis. The mRNA molecules travel out of the nucleus into the cytoplasm and are translated into proteins in the cytoplasm.