LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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carries the amino acids to the ribosome to be made into the protein
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copies the instructions from DNA
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makes up the ribosome
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is made in the nucleus and moves out into the cytoplasm
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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: -Molecules of tRNA typically contain fewer than 100 nucleotide units and fold into a characteristic cloverleaf structure. Specialized tRNAs exist for each of the 20 amino acids needed for protein synthesis, and in many cases more than one tRNA for each amino acid is present.
Detailed explanation-3: -The match between the mRNA codon and the tRNA anticodon determines whether the aa-tRNA advances into the A site, eventually appending its amino acid to the nascent polypeptide chain, or dissociates from the ribosome.
Detailed explanation-4: -tRNAs (transfer RNAs) carry amino acids to the ribosome. They act as “bridges, ” matching a codon in an mRNA with the amino acid it codes for.
Detailed explanation-5: -Transfer RNA (abbreviated tRNA) is a small RNA molecule that plays a key role in protein synthesis. Transfer RNA serves as a link (or adaptor) between the messenger RNA (mRNA) molecule and the growing chain of amino acids that make up a protein.