Ribosomes provide the scaffolding on which trnas interact with mrna during translation of an mrna sequence to a chain of amino acids. A ribosome has three binding sites. What are these three binding sites?

Explanation:

1. Protein synthesis occurs with the combination of ribosomes (large subunit and small subunit) mRNA and tRNA.  

2. mRNA contains nucleotide sequences in the form off codons, which codes specific amino acids according to their bases.

3. tRNA contains anti-codons, and according to the codons in mRNA, tRNA brings amino acids to the ribosomes and the synthesis of protein occurs.

4. Ribosome has three binding sites: The A site, the P site, and the E site. First of all, an aminoacy-tRNAs (a tRNA containing amino acid covalently attached) first enter the ribosome at the A site, and then to P site and finally exits via E site.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!