Question

what is the role of an mrnas 5 utr in initiating translation? select the two best answers. it attaches the initial amino acid, methionine, to a trna with the anticodon uac. it binds to the ribosome in such a way that the start codon (aug) is in the precise position for translation to start. it
ecruits\ the large subunit of the ribosome to bind to the small subunit, making the ribosome complete and the initiation of translation possible. it attaches the mrna to the small subunit of the ribosome. in some species, the 5 utr on an mrna binds to sequences in an rrna in the small ribosomal subunit. this binding is between ribonucleotide sequences that are antiparallel and form a-u and g-c pairs. evaluate whether this statement is true or false: this interaction is another example of how specific binding events make key things happen in the cell. true false

Explanation:

• For the first part (mRNA's 5' UTR role in translation initiation):
• The 5' UTR helps in binding the mRNA to the small subunit of the ribosome. This binding positions the start codon (AUG) correctly for translation initiation.
• The first option is incorrect as amino - acid attachment to tRNA is done by aminoacyl - tRNA synthetases. The third option is incorrect as the 5' UTR is not directly involved in recruiting the large ribosomal subunit.
• For the second part (statement evaluation):
• Specific binding events, such as complementary base - pairing (A - U and G - C) between mRNA's 5' UTR and rRNA in the small ribosomal subunit, are crucial for cellular processes like translation initiation. This is a classic example of how specific molecular interactions drive key cellular functions.

Answer:

• First question:
• It binds to the ribosome in such a way that the start codon (AUG) is in the precise position for translation to start.
• It attaches the mRNA to the small subunit of the ribosome.
• Second question: True.