In a ribosome there are 3 tRNA sites (P, A and E).
The P site, also called the peptidyl site, binds to the tRNA holding the growing polypeptide chain of amino acids. THIS IS YOUR ANSWER!...P or peptidyl
The A site (acceptor site) binds the aminoacyl tRNA which brings the new amino acid that will be added to the polypeptide chain.
The E site (exit site) serves as the exit and is where the tRNA that has now lost its amino acid lets go of the ribosome.
The correct answer is the 3rd option
Nucleotides in general has three components. First is the phosphate group that acts as a backbone for the final nucleic acid formed. Second is the pentose sugar which is a 5 carbon sugar; in DNA the sugar is deoxyribose and in RNA the sugar is ribose. Third is the nitrogenous base; it can either be adenine, guanine, cytosine, thymine (in DNA) or uracil (in RNA).
300 Identified and confirmed with the exception of 200 that still need to be evaluated.