Which of the following statements is true regarding ribosomes?
a. They are composed of two separate units, each made of rRNA combined with protein.
b. They are used to translate the mRNA sequence into a protein composed of amino acids.
c. They have three different tRNA binding sites
d. all of the above
e. a and b only
Adv.
All of the above: Ribosomes are the sites of protein translation. Translation is the process of synthesizing a protein molecule. The building blocks of proteins are amino acids. Ribosomes are composed of two different subunits. Each subunit will contain rRNA and protein. The two subunits will be attached during translation. Moreover, the ribosomes contain three binding sites for tRNA. Those are aminoacyl (A) site, peptidyl (P) site and exit (E) site. Thus, the options (a), (b) and (c) are correct.
Hence, the correct option is (d) all of the above.