Question

Which of the following statements concerning ribosomes are true? Several ribosomes are often attached to and translating the same mRNA. Ribosomes join amino acids to form a polypeptide. Ribosomes have a binding site for mRNA and three binding sites for tRNA molecules. No protein synthesis within a cell would occur without ribosomes. All of the above statements are true.

Answer 1

Answer:

1) Several ribosomes are often attached to and translating the same mRNA- True

2) Ribosomes join amino acids to form a polypeptide - True

3) Ribosomes have a binding site for mRNA and three binding sites for tRNA molecules- True

4) No protein synthesis within a cell would occur without ribosomes- True

Explanation:

1) When a messenger RNA is being translated, a number of ribosomes  are invariably seen to be attached along the length of the  mRNA thread. This complex of ribosomes and mRNA is called a polyribosome, or polysome.

2) Ribosomes have binding sites on them for tRNAs which bind to the ribosomal sites and help in the peptide bond formation between amino acids. So ribosome help in the process.

3) Ribosomes bind to the mRNA on the Start or initiation codon and have three binding sites namely P, A , E where the tRNA binds.

4) Ribosomes are the protein factories of the cell.

ALL ARE TRUE!! Hope it helps!!