Hydrogen bonding in biology

I have tried to solve this question. I can’t understand
can you help me understand it? I think answer is 9= 3*3 but answer is 18.

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Although ribosomes have three sites for binding tRNA molecules, ribosomes bind no more than two tRNA molecules at any given time. The tRNA in the P site holds the peptide chain, then passes it to the tRNA originally in the A site as a new peptide bond forms. The first tRNA exits the E site of the ribosome before a new tRNA enters the A site.
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two trna’s each with 9 max hydrogen bonds is 18 bonds

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wow you are angle thank you so much :blush::blush::innocent:


hey How did you come to know that tRNA has max 9 hydrogen bonds?

tRNA has 3 N Bases. For Max let’s say they are all Cytosines and Guanines having 3 H bonds each. So you have 3x3 = 9 H bonds.


as you know the tRNA brings over amino acids to the ribosome to create a polypeptide that matches the one the mRNA is coding for, to ensure that it does that correctly, the tRNA has what is called an anti codon. an anti codon is a trinucleotide sequence that is complementary to the actual codon on the mRNA, and it should bind to the mRNA through hydrogen bonds. C binds with 3 hydrogen bonds to G, and U with 2 to A.
So max would be 3 of C’s and G’s.


Gotcha! Really appreciate you explaining it

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Aha Got it! Thanks a lot for clarifying

May I ask where did you find this question?