OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ribosomal RNA (rRNA) molecules
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transfer RNA (tRNA) molecules
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messenger RNA (mRNA) molecules
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None of the above
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Detailed explanation-1: -Each tRNA molecule has two distinct ends, one of which binds to a specific amino acid, and the other which binds to the corresponding mRNA codon. During translation, these tRNAs carry amino acids to the ribosome and join with their complementary codons.
Detailed explanation-2: -When a tRNA recognizes and binds to its corresponding codon in the ribosome, the tRNA transfers the appropriate amino acid to the end of the growing amino acid chain. Then the tRNAs and ribosome continue to decode the mRNA molecule until the entire sequence is translated into a protein.
Detailed explanation-3: -This initiator tRNA always carries the amino acid methionine (in bacteria, a modified form of methionine-formylmethionine-is used) so that all newly made proteins have methionine as the first amino acid at their N-terminal end, the end of a protein that is synthesized first.